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EZT-430i - Environmental Test Chambers from Cincinnati Sub-Zero

1. OS Cincinnati Sub Zero Note The profile pre run value is used to indicate that EZT 430i is either offline or downloading a profile to the loop control boards Therefore do not attempt to write a profile to EZT 430i or perform control actions wile the profile mode is in pre run Note Auto tune may not be available depending upon the loop configuration If auto tune operation is not available auto tune will automatically turn off after being set The Watlow F4 contains multiple PID sets which can be tuned while EZT 430i supports only one PID Set 1 B3 Parameter Description Value P 0 Profile off 1 Profile Pre run 2 Profile Run 3 Profile Hold B4 Parameter Deviation Process Value Alarm Alarm Range Low 18000 SP Low Range High 18000 SP High B5 dal Description Value P 0 Auto tune off 1 Auto tune on B6 Key press simulation values accept a write of any data value to perform their action B7 Parameter fa Value Description 0 Temperature 3 Process units B8 Parameter Temperature Temperature Process Value Units C Units F Units Range Low 1 1 1 Range High 555 999 999 B9 Range limited to standard printable ASCII characters 0 9 A Z etc B10 Parameter Description Value P 1 Ramp Time 3 Soak 4 Jump 5 End A 16 CSZ EZT 430i Operation Cincinnati Sub Zero C1 The units of meas
2. EZT 430i clears program buffer Send program to EZT 430i one step at a time with a minimum 1 second pause between write commands Send program data 100 thru 113 Is the program already loaded 1 second pause NO Send step 1 data 114 thru 127 1 second pause Send step 2 data 128 thru 141 1 second pause I YES Send last step data Write error during program download Set program start 1 second pause step 14 1 64 EZT 430i begins program download Set program to run 15 0 Is EZT 430i online 0 0 EZT 430i Data Registers CSZ EZT 430i 5 11 standard serial interface EZT 430i Cincinnati Sub Zero 6 EZT 430i Simulated F4S D Interface Operation The EZT 430i simulated Watlow F4S D interface mode allows EZT 430i to appear as a Watlow F4 controller to Watlow s Watview software This allows EZT 430i to be placed on an existing serial communication link with other F4 controllers already communicating with WatView or another software package This eliminates the need for users already familiar with their existing software to learn another software package in order to communicate with EZT 430i It also allows for the replacement or upgrade of older individual F4 controllers without having to implement a complete changeover This section targets the functionality provided by the EZT 430i F4S D interface and not the specifics on how to interface with a Watlow F4S D
3. An applications engineer will discuss your application with you Please have the following information available e Complete Model s and or Serial s for Component s in Question e Complete Software Version s All Configuration Information e All User Manuals Warranty and return information is on the back cover of this manual Your Comments Your comments or suggestions on this manual are welcome Please send them to CSZ 12011 Mosteller Road Cincinnati OH 45241 Telephone 1 513 772 8810 751 5444 fax 1 513 772 9119 cszinc cszinc com The EZT 430i is copyrighted by Cincinnati Sub Zero 2012 all rights reserved www cszindustrial com CSZ EZT 430i Preface EZT 430i Cincinnati Sub Zero 1 What E EE 1 1 NN GE 1 1 2 COMMUNICATIONS Wiring iuriinancin ina ci 2 1 3 en EE 3 1 3 1 Explanationof Run EE 3 1 4 Serial COMMUNICAUON ci 4 1 4 1 Interface Standards siesena eaa A Ai caida 4 2 BAT Interface Converters a iii 4 3 SNE dere Tee cit tia 4 4 4 3 Creating your own Modbus Application 0 cccceeeeeeeeeeeeeeeeeeeeeeeaeeeeeaeeceeeeseaeeseaaeseeeeeseaeeesaeeneneeee 4 6 AA Packo SNA A A A A a E 4 7 4 3 2 ELFOFENOCKIOS ET 4 10 4 3 3 Transmitting and RECEIVING Messages 4 11 5 EZT 430i Data Registers standard serial interface cccccseeseseeeeeeeeeeeeeeeeeees 5 1 5 1 Control ee TEE 5 2 5 2 Automatic Program Registers oococccinnniconnccnocccconcnnnnonnnnnnccnoncn nano nn
4. User Responsibility Refrain from reading or writing from to a register that does not exist or is currently disabled Writing values to unassigned registers could cause system instability malfunction or failure Care must also be taken in that the process can not cause damage to property or injury to personnel if the wrong commands are sent due to operator error or equipment malfunction 4 6 CSZ EZT 430i Serial Communication EZT 430i Cincinnati Sub Zero 4 3 1 Packet Syntax Each message packet begins with a one byte controller address from 0x01 to Ox1F The second byte in the message packet identifies the message command read 0x03 write single 0x06 or write multiple 0x10 The next n bytes of the message packet contain register addresses and or data The last two bytes in the message packet contain a two byte Cyclical Redundancy Checksum CRC for error detection Packet format nn nn nn nn nanan address A command registers and or data CRC Read Register s Command 0x03 This command returns from 1 to 60 registers This command is used for reading one or more data locations from EZT 430i Packet sent to EZT 430i nn 03 nn nn 00nn nnnn controller address 1 byte read command 0x03 starting register high byte starting register low byte number of registers high byte 0x00 number of registers low byte CRC low byte CRC high byte Packet
5. 4002 Ox0FA2 Profile Edit Action w El E 4003 0x0FA3 Profile Step Type W 4009 0x0FA9 Autostart Ramp Soak Time hours W 0 99 KS 4010 O0x0FAA Autostart Ramp Soak Time minutes W 0 59 Fa 4011 0x0FAB Autostart Ramp Soak Time seconds W 0 59 e Data Range ap Register Address Parameter Description D E Type Low High Unit AENA A EA NA Operation CSZ EZT 430i A 17 EZT 430i Cincinnati Sub Zero 4030 Ox0FBE Event Output 1 Ramp Soak Steps 4031 0x0FBF Event Output 2 Ramp Soak Steps 4032 0x0FC0 Event Output 3 Ramp Soak Steps 4033 0x0FC1 Event Output 4 Ramp Soak Steps 4034 0x0FC2 Event Output 5 Ramp Soak Steps 4035 0x0FC3 Event Output 6 Ramp Soak Steps al NI 4044 0x0FCC Ramp Set Point Channel 1 Ramp Time Step W 32768 32767 l ojojojojoljo 4045 0x0FCD Ramp Set Point Channel 2 Ramp Time Step W 32768 32767 F2 4048 0x0FD0 Guaranteed Soak Channel 1 Ramp Soak Steps W 0 1 4049 0x0FD1 Guaranteed Soak Channel 2 Ramp Soak Steps W 0 1 4051 0x0FD3 Jump to Step Jump Step Ww 1 64 4052 0x0FD4 Jump Repeats Jump Step W 1 999 4061 0x0FDD End Idle Setpoint Channel 1 End Step w 32768 32767 ES 4062 OxOFDE End Idle Setpoint Channel 2 End Step W 32768 32767 ane Notes
6. Cincinnati Sub Zero EZT 4301 Single Dual Loop Controller User Communications Reference Manual LOOP 1 100 0 LOOP 2 EZT 430i Cincinnati Sub Zero Safety Information in this Manual Notes cautions and warnings appear throughout this book to draw your attention to important operational and safety information A NOTE marks a short message to alert you to an important detail A CAUTION safety alert appears with information that is important for protecting your equipment and performance A WARNING safety alert appears with information that is important for protecting you others and equipment from damage Pay very close attention to all warnings that apply to your application A This symbol an exclamation point in a triangle precedes a general CAUTION or WARNING statement A This symbol a lightning bolt in a lightning bolt in a triangle precedes an electric shock hazard CAUTION or WARNING safety statement Technical Assistance If you encounter a problem with your EZT 430i controller review all of your configuration information to verify that your selections are consistent with your application inputs outputs alarms limits etc If the problem persists after checking the above you can get technical assistance by dialing 1 513 772 8810 or by faxing your request to 1 513 772 9119 Monday thru Friday 7 30 a m to 5 30 p m Eastern Standard Time You can also email your request to cszinc cszinc com
7. D R W Specifies readable writable data and W specifies a write only control value EI SEH Description Note EZT 430i only supports the create profile and start profile 1 Create profile Star profie A 18 CSZ EZT 430i commands When a value of 1 is written to the register EZT 430i is placed in profile receive mode in which all following write commands are seen as profile data Once the end step is detected the profile receive mode will end When a value of 5 is written to the register EZT 430i will start the currently loaded profile if it is not already running Any other non supported command will be ignored Operation EZT 430i Cincinnati Sub Zero EZ Parameter Description Note EZT 430i does not support the ramp rate step type DO NOT Value send profiles to EZT 430i with steps programmed for ramp rate or 4 Ramp time unexpected operation may occur Use ramp time step types only for both local EZT 430i automatic programs and F4 programs downloaded 3 Soak 4 Jump 5 End FA EZT 430i automatic program steps are entered locally using a time range of hours minutes or minutes seconds EZT 430i cannot be programmed with step times of hours minutes seconds Therefore when programming remotely via an F4S D profile editor all ramp type steps and soak type steps must be programmed in either hours minutes or minutes seconds EZT 430i will then select the proper range time range for ramp soak
8. Output 1 10 characters R 3109 0x0C25 3110 0x0C26 B9 ER thru thru Name Digital Event Output 2 10 characters R 3119 0x0C2F 3120 0x0C30 B9 ER thru thru Name Digital Event Output 3 10 characters R 3129 0x0C39 3130 0x0C3A B9 ER thru thru Name Digital Event Output 4 10 characters R 3139 0x0C43 3140 0x0C44 D D thru thru Name Digital Event Output 5 10 characters R 3149 0x0C4D 3150 0x0C4E BY BY thru thru Name Digital Event Output 6 10 characters R 3159 0x0C57 3200 0x0C80 BY BY thru thru Name Alarm 1 10 characters R 3209 0x0C89 3210 0x0C8A Di ER thru thru Name Alarm 2 10 characters R z 3219 0x0C93 3500 0x0DAC ER B9 thru thru Name Profile 1 10 characters R E 3509 0x0DB5 4100 0x1004 Profile Number Current Status R 1 1 4101 0x1005 Profile Step Number Current Status R 1 64 a A 14 CSZ EZT 430i Operation Les EZT 430i Cincinnati Sub Zero Data Range C Register Address Parameter Description A B Type Low High Unit 4102 0x1006 Profile Step Type Current Status R EA SR z 4111 0x100F Digital Event Output 1 Current Status R 0 1 4112 0x1010 Digital Event Output 2 Current Status R 0 1 4113 0x1011 Digital Event Output 3 Current Status R 0 1 4114 0x1012 Digital Event Output 4 Current Status R 0 1
9. Programs can be copied to the external USB memory stick and then imported to another EZT 430i controller which eliminates the need to enter duplicate programs into multiple systems Data file analysis tools make looking at historical data a simple task Any control variable saved to the data file can be plotted on the historical data chart for any time frame within the data file s total time range The built in Ethernet functionality includes a Web Server to provides access to all EZT 430i data view only a VNC interface for remote control and monitoring and an NTS clock all available via a local Intranet connection wired or wireless or the World Wide Web using standard software like Microsoft s Internet Explorer EZT 430i provides a rich set of tools for control interaction and process monitoring Views include single and dual loop views charts alarm automated program status as well as historical data alarm log and audit trail views The menu driven interface eliminates screen clutter by providing an easy to use Smart Device interface for interaction between the user and EZT 430i EZT 430i can store more than one year of data on its SD memory card Data logging can be enabled manually or automatically during program operation Data backup is provided with a USB memory stick for plug and play transfer of files to any PC running Microsoft Windows XP operating systems and via the FTP back up utility EZT 430i protects syst
10. SP SPACE 32 00100000 20 96 01100000 60 Shift 1 33 00100001 21 a A 97 01100001 61 w Shift 34 00100010 22 b B 98 01100010 62 Shift 3 35 00100011 23 c C 99 01100011 63 Shift 4 36 00100100 24 d D 100 01100100 64 Shift 5 37 00100101 25 e E 101 01100101 65 amp Shift 7 38 00100110 26 f F 102 01100110 66 E 39 00100111 27 g G 103 01100111 67 Shift 9 40 00101000 28 h H 104 01101000 68 Shift 0 41 00101001 29 l l 105 01101001 69 id Shift 8 42 00101010 2A j J 106 01101010 6A Shift 43 00101011 2B k K 107 01101011 6B i j 44 00101100 2C l L 108 01101100 DC 45 00101101 2D m M 109 01101101 6D i e 46 00101110 2E n N 110 01101110 6E 47 00101111 2F o O 111 01101111 6F 0 0 48 00110000 30 p P 112 01110000 70 1 1 49 00110001 31 q Q 113 01110001 71 2 2 50 00110010 32 r R 114 01110010 72 3 3 51 00110011 33 s S 115 01110011 73 4 4 52 00110100 34 t T 116 01110100 74 5 5 53 00110101 35 u U 117 01110101 75 6 6 54 00110110 36 v V 118 01110110 76 7 7 55 00110111 37 w W 119 01110111 77 8 8 56 00111000 38 x X 120 01111000 78 9 9 57 00111001 39 y Y 121 01111001 79 E Shift 58 00111010 3A z Z 122 01111010 7A 59 00111011 3B Shift 123 01111011 7B lt Shift 60 00111100 3C Shift 124 01111100 7C 61 00111101 3D Shift 125 01111101 7D gt Shift 62 00111110 3E Shift 126 01111110 7E 2 Shift 63 00111111 3F DEL Delete 127 01111111 7F 3 2 CSZEZT 430i Communication Basics EZT 430i Ci
11. characters for identification enquiry inquiry start of text end of text end of transmission acknowledge negative acknowledge and escape The ASCII code is sometimes written in a base 16 number system that is called hexadecimal or hex for short The numbers 0 through 9 represents the first ten digits of this system and the letters A through F represents the final six digits The 128 ASCII character codes with the decimal binary and hexadecimal equivalents are listed in the following table ASCII Control Codes ASCII Control Codes are used to give instructions to the remote device and result in specific actions such as a line feed instruction on a printer ASCII Control Codes the first 33 ASCII characters non printable are important for the operation of communicating equipment They give instruction to remote devices that result in specific actions such as a line feed on a printer Holding down the keyboard control key while pressing the appropriate keyboard key is what sends these values Communication Basics CSZ EZT 430i 3 1 Les EZT 430i Cincinnati Sub Zero ASCII Character Chart Char Code Decimal Binary Hex Char Code Decimal Binary Hex NUL Ctrl 0 00000000 00 Shift 2 64 01000000 40 SOH CtrlA 1 00000001 01 A Shift A 65 01000001 41 STX Ctrl B 2 000000
12. controller It is assumed that users who choose to use this interface mode are already familiar with or have an existing F4 installation and wish to continue its use while integrating the EZT 430i into that installation base For specifics on how to communicate with a Watlow F4 controller or to obtain the full list of communications registers see the Series F4S D User s Manual available from Watlow s website http www watlow com downloads en manuals Series 20F4SD_Rev 20H paf 6 1 F4S D Supported Control Monitoring Data Registers The following table of data registers represents active functional data registers for the F4 interface that are used by EZT 430i for control monitoring While EZT 430i provides the full register base of a Watlow F4S D to insure compatibility with WatView many of the registers are non functional The purpose of the interface is to allow control monitoring and not configuration setup of EZT 430i Data Range x C Register Address Parameter Description A B Type Low High Unit 100 0x0064 Input 1 Value Status R 32768 32767 ct 101 0x0065 Input 1 Error Status R B1 102 0x0066 Alarm 1 Status R Be Be 103 0x0067 Power Output 1A Status R 0 100 00 104 0x0068 Input 2 Value Status R 32768 32767 fal 105 0x0069 Input 2 Error Status R KE ZS 106 0x006A Alarm 2 Status R KE SS 107 0x006B Power Outp
13. in Step R 0 99 59 27 0x001B Cycles Remaining for Current Jump Loop R 1 10000 28 0x001C 29 0x001D 30 0x001E 31 0x001F Loop 1 Target Setpoint for Current Step R 32768 32767 Si 32 0x0020 Loop 2 Target Setpoint for Current Step R 32768 32767 K 23 0x0021 34 0x0022 35 0x0023 Loop 1 Process Variable PV R 32768 32767 E 36 0x0024 Loop 1 Setpoint SP R W 32768 32767 ce 5 2 CSZ EZT 430i EZT 430i Data Registers standard serial interface EZT 430i Cincinnati Sub Zero Register o Data Range 0 Address Parameter Description A B Type Low High Unit 37 0x0025 Loop 1 Percent Output Out R W 100 00 100 00 38 0x0026 Loop 1 Mode and Operational Status R SEN B10 i 39 0x0027 Loop 1 Error Code R BTI BTI 40 0x0028 Loop 2 Process Variable PV R 32768 32767 C1 A1 0x0029 Loop 2 Setpoint SP R W 32768 32767 Ki 42 0x002A Loop 2 Percent Output Out R W 100 00 100 00 43 0x002B Loop 2 Mode and Operational Status R ai B10 E 44 0x002C Loop 2 Error Code R Di Di g 45 0x002D 46 0x002E 47 0x002F 48 0x0030 49 0x0031 50 0x0032 51 0x0033 Alarm 1 Setpoint R W B12 B12 SCH 52 0x0034 Alarm 2 Setpoint R W B12 Ble ei 53 0x0035 Alarm 3 Setpoint R W akg Ble E 54 oxoose Alarm4Sepont aw Pm PT CT 55 0x0037 Alarm 5 Setpoint R W SE B12 C
14. or failed transmissions To insure that the data you receive from a read command is correct and that the controller properly received a write command you must parse the controller s response and validate the return message to insure it is correct In order to validate that the message you received is correct you must caulate the CRC for the received message and compare it with the CRC that the controller appended to the message This verifies that the data you received was what EZT 430i sent If the CRC s do not match there was an error in the transmission and the entire message should be ignored This could then be followed by an attempt to resend the failed command or halt operation and alert an operator Example Read registers 35 and 36 loop 1 process variable and setpoint of controller at address 1 Command sent to EZT 430i 01 03 00 23 00 02 35 C1 Message received from EZT 430i 01 03 04 03 OD 01 F3 2A 61 Caulated CRC 2A61 caulated from message 01 03 04 03 OD 01 F3 Received CRC 2A61 The caulated CRC matches the received CRC the message is valid Note that the last two bytes of the received message are not used to caulate the CRC The last two bytes are the CRC that EZT 430i appended to the message Do not include them when caulating the CRC 4 10 CSZ EZT 430i Serial Communication EZT 430i Cincinnati Sub Zero Transmitting and Receiving Messages In order to reliably communicate with EZT 430i it is important to deve
15. returned from EZT 430i nn 03 nn nn nn nn nn nn nn controller address 1 byte read command 0x03 number of data bytes 1 byte first register data low byte first register data high byte register n data high byte register n data low byte CRC low byte CRC high byte Serial Communication CSZ EZT 430i 4 7 EZT 430i Cincinnati Sub Zero Example Read registers 35 and 36 loop 1 process variable and setpoint of controller at address 1 configured for 1 decimal point Sent 01 03 00 23 00 02 35 C1 Received 01 03 04 03 OD 01 F3 2A 61 Message data 781 0x030D process variable of 78 1 499 0x01F3 setpoint of 49 9 Write Register Command 0x06 This command writes a value to a single register This command is to be used for setting control values in EZT 430i To set multiple values repeat the command for each data location Packet sent to EZT 430i nn 06 nnnn np np pp nn controller address 1 byte aj write command 0x06 register high byte register low byte data high byte data low byte CRC low byte CRC high byte Packet returned from EZT 430i nn 06 nn nn np np annn controller address 1 byte A write command 0x06 register high byte register low byte data high byte data low byte CRC low byte CRC high byte Example Write register 41 loop 2 set point of controller at address one configured with no decimal po
16. simple 1 to 1 connection and RS 485 which provides a multi drop connection where more than one device can be placed on the same line The EZT 430i communications interface is RS 232 but can be changed to RS 485 through the use of external RS232 485 adapters ElA 232 Full Duplex An EIA 232 formerly RS 232C interface uses three wires a single transmit wire a single receive wire and a common line Only two devices can use an ElA 232 interface A 3 to 24 volt signal indicates a 1 and a 3 to 24 volt signal indicates a 0 The EIA 232 signal is referenced to the common line rather than to a separate wire as in ElA 485 Thus an ElA 232 cable is limited to a maximum of 50 feet due to noise susceptibility EIA 485 Half Duplex An ElA 485 interface uses two wires a T R a T R line A 5 volt signal is interpreted as a 1 a 5 volt signal as a 0 As many as 31 slave devices can be connected to a master on a multi drop network up to 4000 feet long Wiring Most PCs have a standard EIA 232 port usually referred to as RS 232 In these instances you must use an interface converter to connect to an ElA 485 multi drop system The standards do not specify the wire size and type Use of 24 AWG twisted pair provides excellent results If shielded cable is used terminate the shield at one end only Always follow the manufacturer s instructions supplied with the interface converter See Biasing of Buses next Biasing of Buses The ElA 485 stand
17. steps when downloading to its loop control boards based on the maximum time programmed in any of the steps of that type in the profile For example if all ramp steps have time entries of only minutes and seconds EZT 430i will select time units of minutes seconds for the profile ramp steps However if a ramp step is programmed with a non zero entry for hours all ramp steps will operate on a time base of hours and minutes Any ramp steps that were then programmed with a minutes seconds entry will ignore the seconds and only use the minutes This may cause unexpected profile operation so be sure to program all profile ramp soak steps accordingly EZ The units of measure and range of an input is dependant upon the configuration of the input and or the units of temperature selection Celsius or Fahrenheit of EZT 430i The decimal point position for the input is an implied value based on the decimal point selection for the input Thus a register value of 345 can represent an actual process value of 345 34 5 3 45 or 0 345 depending upon the decimal point configuration of the input 6 2 1 Limitations of Profile Download Operation IMPORTANT Please Read The section covers the rules of use when sending F4S D based profiles to the EZT 430i controller These rules must be followed in order to insure proper profile operation especially when using the Profile Editor tool of WatView software WatView s operation can not be altered to comply with the m
18. supply This is especially necessary when using a laptop computer See the documentation that is provided with your converter for more information Not all converters are equal in performance If your chamber operates in a harsh electrically noisy environment this can cause less robust converters to work intermittently or not at all The following converter has been tested and is compatible with EZT 430i The converter is equipped with automatic send data control circuits driver control in the converter hardware so you don t have to work with software at all The circuit monitors data flow and enables the driver during transmission and automatically disables it when no data is being sent There is no need to rework software or install new drivers US Converters 405 W Fairmont Dr Tempe AZ 85282 E mail mail usconverters com www USconverters com Part XS201A RS232 to RS485 Converter Future Design Controls 7524 West 98th Place Bridgeview IL 60455 Phone 888 751 5444 Fax 888 307 8014 E mail csr futuredesigncontrols com www futuredesigncontrols com Part SNA10A Smart Network Adapter Part DB9M DB9F 6ft Cable Accessory to connect SNA10A to PC Serial Communication CSZ EZT 430i 4 3 EZT 430i Cincinnati Sub Zero 4 2 Protocol Protocol describes how to initiate an exchange It also prevents two machines from attempting to send data at the same time There are a number of different data communications protocols ju
19. that the word be converted to its binary equivalent By converting the value to its binary equivalent it produces a Boolean array of true bit on 1 and false bit off 0 values This allows each bit to be examined individually In the same manner creating a Boolean array of 16 bits produces an equivalent hexadecimal value that can be sent to EZT 430i in order to set a control register For the purpose of this manual parameters defined as bit oriented will have the function of each bit associated with the bit s index number in the data word The index number is equal to that of a typical array function Thus an index number of zero selects the first bit in the word LSB An index number of 1 selects the second bit in the word and so on This helps eliminate offset selection errors that may occur when coding software and using array functions to select which bit in the word that is required for examination Data Register 1 word 16 bits 0000000000000000 MSB Adhere to the following lists of registers and their allowable data ranges DO NOT attempt to write to any other register number than those listed DO NOT write to registers that are for options your controller does not have Failure to adhere to this requirement can result in erratic control and or damage to equipment All register numbers are listed in relative values To convert to absolute values add 400001 EZT 430i Data Registers CSZ EZT 430i 5 1 standard se
20. 10 02 B Shift B 66 01000010 42 ETX Ctrl C 3 00000011 03 Cc Shift C 67 01000011 43 EOT Ctrl D 4 00000100 04 D Shift D 68 01000100 44 ENQ Ctrl E 5 00000101 05 E Shift E 69 01000101 45 ACK Ctrl F 6 00000110 06 F Shift F 70 01000110 46 BEL Ctrl G 7 00000111 07 G Shift G 71 01000111 47 BS Ctrl H 8 00001000 08 H Shift H 72 01001000 48 TAB Ctrl 1 9 00001001 09 l Shift 73 01001001 49 LF Ctrl J 10 00001010 0A J Shift J 74 01001010 4A VT Ctrl K 11 00001011 0B K Shift K 75 01001011 4B FF Ctrl L 12 00001100 DC L Shift L 76 01001100 AC CR Ctrl M 13 00001101 0D M Shift M 77 01001101 4D SO Ctrl N 14 00001110 OE N Shift N 78 01001110 4E SI Ctrl O 15 00001111 OF O Shift O 79 01001111 4F DLE Ctrl P 16 00010000 10 P Shift P 80 01010000 50 DC1 CtrlQ 17 00010001 11 Q Shift Q 81 01010001 51 DC2 Ctrl R 18 00010010 12 R Shift R 82 01010010 52 DC3 Ctrl S 19 00010011 13 S Shift S 83 01010011 53 DC4 Ctrl T 20 00010100 14 T Shift T 84 01010100 54 NAK Ctrl U 21 00010101 15 U Shift U 85 01010101 55 SYN Ctrl V 22 00010110 16 V Shift V 86 01010110 56 ETB Ctrl W 23 00010111 17 W Shift W 87 01010111 57 CAN Ctrl X 24 00011000 18 x Shift X 88 01011000 58 EM Ctrl Y 25 00011001 19 Y Shift Y 89 01011001 59 SUB Ctrl Z 26 00011010 1A Z Shift Z 90 01011010 5A ESC Ctrl 27 00011011 1B 91 01011011 5B FS Ctrl 28 00011100 1C 92 01011100 5C GS Ctrl 29 00011101 1D 93 01011101 5D RS Ctrl 30 00011110 1E A Shift 6 94 01011110 5E US Ctrl 31 00011111 1F IE Shift 95 01011111 5F
21. 4115 0x1013 Digital Event Output 5 Current Status R 0 1 4116 0x1014 Digital Event Output 6 Current Status R 0 1 4119 0x1017 Hours Remaining Ramp Soak Step R 0 99 S 4120 0x1018 Minutes Remaining Ramp Soak Step R 0 59 4121 0x1019 Seconds Remaining Ramp Soak Step R 0 59 z 4122 0x101A Set Point Channel 1 Current Profile Status R 32768 32767 S 4123 0x101B Set Point Channel 2 Current Profile Status R 32768 32767 ZS 4126 0x101E Jump Count Current Profile Status R 1 10000 Notes Parameters descriptions with Watlow F4 designations of channel 1 input 2 etc refer to EZT 430i data values for loop 1 or loop 2 A R W Specifies readable writable data R specifies read only data and W specifies a write only control value B The range of certain parameters are dependent upon system options Consult the following range tables for information regarding the use of these parameters B1 Parameter WS Value Description 0 No error 5 Indicates loop input sensor trouble B2 Parameter ae i Value Description Note EZT 430i can provide up to 6 alarms depending upon configuration however the Watlow F4 is only equipped with two 0 No alarm alarms Thus only EZT 430i alarms 1 and 2 if configured are able to be monitored 1 High alarm 2 Low alarm Operation CSZ EZT 430i A 15 EZT 430i
22. 430i controllers on the PC communications link Communications Wiring CSZ EZT 430i 2 1 Cincinnati Sub Zero EZT 430i To next nCompass US Converters RS232 to RS485 Converter part no XS2014 US Converters RS232 to RS485 Converter part no X52014 FDC SNA1DA RS232 to RS485 Network Adapter RS 292 TR PC wm me LE Shield NOTE The connection requires a single twisted pair cable that is daisy chained from one EZT 430i to the next When using shielded twisted pair cable be sure to ground only when end of the cable preferably at the RS232 to RS485 network adapter Allowing any other portion of the cable shield to come in contact with ground or grounding both ends will cause ground loop currents to flow in that section of the cable which can cause communication errors 2 2 CSZ EZT 430i Communications Wiring EZT 430i Cincinnati Sub Zero 3 Communication Basics The purpose of this document is to provide users interested in using data communications with the EZT 430i the ability to set up and use a simple network of one or more EZT 430i controllers by providing a basic understanding of data communications using standard definitions interfaces and protocols In this manual numbers in the format 0x00 represent values in hexadecimal Numbers in the format 0 represent values in decimal and finally numbers in the format 00000000 represent values in binary unless otherwise stated 3 1 Explanation of T
23. Hours and Minutes 1 Minutes and Seconds 2 Units Minute 3 Units Hour E3 Parameter as Value Description 0 Hours and Minutes 1 Minutes and Seconds EA ER Parameter e AN Value Description 0 Ramp 1 Soak 2 Jump 3 End ES Parameter SS Value Description Bito Event Output 2 Bit1 Event Output 3 Bit2 Event Output 4 Bit3 Bit15 Not Assigned E7 EZT 430i Data Registers standard serial interface Cincinnati Sub Zero Note DO NOT use ramp units of units minute or units hour on a dual loop system Since step time is defined by the ramp rate and the change in set point the program will get out of sync between each loop causing an automated program run error See note B9 in Section 5 1 for information on the range of this parameters Note The last step of an automatic program must be an end step If the last step is not an end step the program will not run correctly and or a program download error will occur and the program will not operate Note The available system events are based on the configuration of nCompass Event 1 may correspond to loop 1 event output 4 and event 2 may correspond with loop 2 event output 3 To properly set the events of your EZT 430i system you must know the event output configuration of the loop controls and set the appropriate bit for the output the event is assigned to Contact your OEM for equipment related questions Only they can answer questions regarding the configura
24. Limit Analog Input 1 R 32768 32767 1 606 0x025E Decimal Point Analog Input 1 R 0 3 608 0x0260 Process Units Analog Input 1 R Bi B7 R 612 0x0264 Set Point Low Limit Analog Input 2 R 32768 32767 KA 613 0x0265 Set Point High Limit Analog Input 2 R 32768 32767 KC 616 0x0268 Decimal Point Analog Input 2 R 0 3 618 0x026A Process Units Analog Input 2 R Ka E 901 0x006F F or C System R 0 1 1205 0x04B5 Guaranteed Soak Band Channel 1 R W BB B8 Ki 1209 0x04B9 Resume a Profile Key Press Simulation WwW Ka KE 1210 0x04BA Hold a Profile Key Press Simulation Ww ES BG 1212 0x04BC Guaranteed Soak Band Channel 2 R W BB Be Ki Operation CSZ EZT 430i A 13 EZT 430i Cincinnati Sub Zero Data Range C Register Address Parameter Description A B Type Low High Unit 1217 0x04C1 Terminate a Profile Key Press Simulation W 28 E 2000 0x07D0 Digital Event Output 1 Condition R W 0 1 2010 0x07DA Digital Event Output 2 Condition R W 0 1 2020 0x07E4 Digital Event Output 3 Condition R W 0 1 2030 0x07EE Digital Event Output 4 Condition R W 0 1 2040 0x07F8 Digital Event Output 5 Condition R W 0 1 2050 0x0802 Digital Event Output 6 Condition R W 0 1 3100 0x0C1C BS BY thru thru Name Digital Event
25. SZ EZT 430i 4 9 EZT 430i Cincinnati Sub Zero When EZT 430i cannot process a command it returns an exception response and sets the high bit 0x80 of the command 0x01 illegal command 0x02 illegal data address 0x03 illegal data value Packet returned from EZT 430i nn nn nn nn nn controller address 1 byte A command 0x80 _ exception code 0x01 or 0x02 or 0x03 CRC low byte CRC high byte 4 3 2 Error Checking In Modbus communications every message sent from the master your software receives a response from the slave EZT 430i including write commands Thus after each command sent you must read the controller response before sending the next message This provides the method of error checking in order to verify that the message you sent was received correctly and that the controller is operating accordingly This allows you to then determine the appropriate recovery response in case the message was not received correctly by the controller and what action is to be taken by an operator and or the software itself The exception responses provide a basic form of error checking When an exception response is received the code provided in the response will tell you what the error was in the sent message However this is only valid if the controller receives the message you sent and there was an out of range value or simple transmission error in the message It does not validate incomplete
26. ack Band Loop 2 Ww EI El 105 0x0069 106 0x006A Total Number of Steps Ww 1 64 107 0x006B Program Name Chars 1 amp 2 W Ei Ei i 108 0x006C Program Name Chars 3 amp 4 W Ei Ei i 109 0x006D Program Name Chars 5 amp 6 W Ei 110 0x006E Program Name Chars 7 amp 8 W E4 i 111 Ox006F Program Name Chars 9 amp 10 W Ei E4 112 0x0070 Program Name Chars 11 amp 12 W Ei E4 113 0x0071 Program Name Chars 13 amp 14 W E4 E4 g EZT 430i Data Registers CSZ EZT 430i 5 7 standard serial interface EZT 430i Cincinnati Sub Zero The following 14 registers of the automatic program contain the data for step 1 of the program Data Range Geo Parameter Description D E A l i Type Low High Unit 114 0x0072 Step Number W 0 63 115 0x0073 Step Type W Ka Le 116 0x0074 Ramp Target Setpoint Loop 1 W 32768 32767 PV 117 0x0075 Ramp Time or Ramp Rate W 0 5999 118 0x0076 Event Selections 1 2 3 Ww ER EG 119 0x0077 Holdback Type Loop 1 W iz 120 0x0078 Dwell Time W 0 9999 121 0x0079 Jump Step W 0 63 122 0x007A Jump Cycles W 1 9999 123 0x007B Final Setpoint Loop 1 W 32768 32767 PV 124 0x007C Ramp Target Setpoint Loop 2 W 32768 32767 PV 125 0x007D Event Selections 4 5 6 W ES 126 0x007E Holdback Type Loop 2 W ES Ka 127 0x007F Final Setpoint Loop 2 W 32768 32767 PV The Step Number mu
27. anner in which EZT 430i operates so it is up to the end user to insure that profiles are created and sent to EZT 430i properly 6 2 1 1 Sending Profiles to EZT 430i The Watlow F4S D controller is capable of storing up to 40 profiles with up to 256 steps EZT 430i stores profiles differently therefore only one profile profile 1 can be sent to EZT 430i at a time If another profile is sent it overwrites the previous profile When using the WatView Profile Editor DO NOT attempt to read profile image from controller Selecting this function will cause WatView to get stuck in an infinite loop and the program will have to be shut down manually and possibly require a reboot of the PC EZT 430i does not support the read of a profile from its memory Only profile download is supported Thus when using WatView software or other profile editing software made for the F4 profiles must be stored on the PC as separate profile images with each containing a single profile That single profile can then be downloaded when required Note that profiles can not exceed 64 steps If a profile exceeds 64 steps including the end step the download will fail without notice to the user and the previous profile will remain loaded in memory on EZT 430i Operation CSZ EZT 430i A 19 EZT 430i Cincinnati Sub Zero Also due to limitations of WatView software the profile name shown on control and status screens in WatView do not reflect the actual profile name
28. ard requires the bus to be biased for reliable communication This requires termination resistors to be placed across the T R and T R wires One resistor is placed at the PC where it connects to the EIA 485 bus The second resistor is placed at the last controller on the network Do not place resistors at each controller The impedance of the wires used for the bus determines the resistor value For twisted pair the value is typically 120 ohms In addition it may be necessary to have a pull up and pull down resistor between the power supply and ground of the interface adapter Check the documentation that came with your interface adapter Biasing the bus reduces reflection of signals sent down the bus These reflections are sometimes referred to as a standing wave This condition is most notable when communicating at high baud rates over longer distances 4 2 CSZ EZT 430i Serial Communication EZT 430i Cincinnati Sub Zero 4 1 1 Interface Converters The purpose of an interface converter is to allow two different buses to be connected together Interface converters are required when connecting an ElA 232 port to an EIA 485 bus The EIA 485 bus is a half duplex bus This means that it can only send or receive data at any given time Some interface converters on the market provide the ability to have full duplex with the EIA 485 bus This is accomplished by using two receivers and transmitters tied in tandem This type of converter will not work w
29. at based on the programming for all ramp and soak steps For example if all ramp steps have only entries for minutes and seconds all hour entries are 0 EZT 430i will select minutes seconds for the ramp step time format However if a single ramp step has a non zero entry for hours it will use the hours minutes status registers for operation This causes any steps that were configured with only minutes and seconds to discard the seconds entry and only use the minutes This can cause unexpected profile operation It is then necessary to insure that when a profile is created using the Profile Editor of WatView that all ramp steps use the same entry fields for time and all soak steps use the same entry fields for time That means that if any step of your profile must operate for at least 1 hour you will have to use hours minutes for all other steps of that type Any entries for seconds will be ignored Note that a step time of 0 can be entered under any circumstance so if you have to use the hours minutes range and a step time of 1 minute is too long you can enter 0 6 2 1 3 Setting Final Setpoints If EZT 430i is configured to end its automatic program with a final setpoint you must set the F4 end step type to idle This then allows you to set the idle setpoints of the end step in the WatView Profile Editor If you do not do this the setpoints default to their low limit value and the system will assume these setpoints upon the end step of the pro
30. currently running in EZT 430i If a user were to select and run a profile locally at EZT 430i the name field data registers of the serial interface are updated to show the correct profile name however WatView does not read them and update its display fields dynamically It only uses the names of the profile image currently loaded in WatView for the controller Thus the user must be sure that when a profile is downloaded or started from WatView that the local EZT 430i interface displays the correct profile name to insure the desired profile is running When a profile is sent to EZT 430i over the serial interface upon receiving the last step EZT 430i must then download the profile to its loop control boards During this process the operating mode register 200 will indicate a pre run status 1 for the profile When the profile state returns to profile off 0 the download is complete and the profile can be started 6 2 1 2 Setting Proper Step Times Ramp rate steps are not supported by EZT 430i even if configured as a single loop controller F4S Thus all profiles must be programmed with ramp time steps either locally at EZT 430i or via the Profile Editor of WatView In addition EZT 430i ramp soak steps must be configured in hours minutes or minutes seconds only Steps can not be programmed with an entry of hours minutes seconds In order for EZT 430i to run the profile correctly it automatically configures itself to use the best time form
31. em access with 4 level security user rights based audit trails that document all user activity and ensures data integrity by digitally signing all data files and audit trails to meet regulatory requirements What is EZT 430i CSZ EZT 430i 1 1 EZT 430i Cincinnati Sub Zero The EZT 430i controller includes the following features Single Dual loop controller models automatic program operation included Touch screen Smart Device user interface Ul Video recorder mode for view only applications Email SMS FTP VNC and Web functionality standard Remote View Control using PC Tablet or Smartphone Detailed maintenance alarm monitoring and alarm history User configurable data logging and historical data viewer 4 level security with digitally signed audit trails and data files National time server connectivity with daylight savings Multi lingual user interface supports over 25 languages 30 000 hour LED display 1 2 CSZ EZT 430i What is EZT 430i EZT 430i Cincinnati Sub Zero 2 Communications Wiring To avoid potential electric shock and other hazards all mounting and wiring for EZT 430i must conform to the National Electric Code NEC and other locally applicable codes Special expertise is required to install wire configure and operate the EZT 430i controller Personnel without such expertise should not install wire or operate nCompass Prevent metal fragments and pieces of wire from dropping inside the hous
32. erms Machine to Machine Communication In order for machines to communicate with each other they need a code called a character format or character set They require rules called protocol to govern their conversation and prevent confusion and errors Computers need a connecting interface over which to communicate They may use one pair of wires to send information in one direction and another pair to send in the opposite direction full duplex or they may use one pair to send data in both directions half duplex Character Format The code or character format for EZT 430i data communications is shared by virtually everyone in the electronics industry This code defines a stream of 1 s and 0 s that are created by varying a voltage signal in a regular manner This code is the American Standard Code for Information Interchange called ASCII Bits and Bytes The word bit is simply the contraction of the words binary digit A bit is the basic unit in ASCII It is either a 1 or a 0 A byte is a string of eight bits that a computer treats as a single character ASCII can use a single byte to represent each letter of the alphabet each digit and each punctuation mark we use ASCII The ASCII code defines 128 separate characters one for each letter digit and punctuation mark ASCII also includes control characters similar to those we find on computer keys such as backspace shift and return It also has nine communications control
33. ers on the serial link With a default timeout period in EZT 430i of 135ms it makes a total pause of 138ms minimum Thus after you receive a response from an EZT 430i controller at your PC you must wait a minimum of 138ms before sending the next command 4 Values containing decimal points such as process values and set points have the decimal point implied i e the data exchange can only be performed using whole numbers Thus the value must be scaled appropriately in order to exchange the data correctly For example a setpoint of 78 4 degrees must be sent as a value of 784 in order for EZT 430i to be set correctly Likewise a process value read from EZT 430i with a value of 827 is actually 82 7 degrees Consult the parameter table for the proper format and allowable range of each value 5 When monitoring a process try to keep the number of read and write commands to a minimum of 500ms between exchanges to a single controller Continuously reading data at a faster rate consumes an excess amount of the controller s processor time and does not provided any additional benefits in process monitoring Handling Communication Errors Messages with the wrong format or illegal values will receive an exception response Messages with the wrong CRC or timing will receive no response It is the user s responsibility to handle the error appropriately within their own software and determine whether to resend the message or halt for operator intervention
34. ge including the CRC be created and assembled prior to being sent to the serial port By assembling the main body of the message first you can then pass it to the CRC algorithm which can step sequentially through the message generate the CRC and append it to the message body Once the message is completely assembled it can then be sent out the serial port as a completed packet This will insure that the message reaches EZT 430i within the proper time frame Receiving Messages Due to the fact that Modbus RTU protocol does not have start of transmission or end of transmission characters if the serial port driver you are using does not support an interval timeout setting allowing you to automatically terminate a read after a specified time passes between bytes signaling the end of a message you must know how long the message will be that you are receiving That allows you to know how many bytes to read from your serial port and when you have received the entire message If you rely on a maximum timeout period to terminate the read depending upon the length of the received message you will either loose a portion of the message or have to set the timeout period so high that it will greatly affect the throughput of your code As can be seen from the previous examples for read and write commands in Section 4 3 1 the length of the returned message will very based on the type of command and for read commands how many registers are being returned Re
35. gned B7 Parameter Description Note Not all system events may be available on your system Event Value names and functions are defined by system configuration Consult your BitO Event 1 system documentation or contact your OEM for information on event use Bit1 Event 2 Bit2 Event 3 Bit3 Event 4 Bit4 Event 5 Bit5 Event 6 Bit6 Bit15 Not Assigned B8 Parameter Go Value Description 0 Automatic Program Start On 1 Automatic Program Hold 2 Automatic Program Halt Off B9 Parameter High Order Low Order Description See the ASCII character chart in Value Byte Byte Section 3 1 for the character representation of these values Range Low 32 32 Program Name Character ASCII Table p i K Range High 126 126 Program Name Character ASCII Table Example Read command of registers 16 to 22 from EZT 430i returns the following values Register Values 0x74 53 0x72 6F 0x20 65 0x65 54 0x74 73 0x20 20 0x20 20 ASCII Equivalent t S ro e e T ts Assemble the ASCII characters in order from low to high byte starting with register 16 in order to assemble the automatic program name Store Test Note that null characters are not used in the program name A space 0x20 will be used is used in place of a null character to maintain the 14 character name length if the program name is not 14 characters long Note The alarm active and event on status bits can not be used for determining alarm or event status The alarm and event activation is ba
36. gram 6 2 1 4 Starting a Profile When starting a profile there is no need to set the profile number as EZT 430i has only one profile loaded and available for run at a time It is then only necessary to send the step to start the profile on 4001 1 to 64 and then set the profile to run 4002 5 A 20 CSZ EZT 430i Operation
37. ing of any EZT 430i component If necessary place a cover over the component during installation and wiring Ingress of such fragments and chips may cause a fire hazard damage or malfunction of the device Locate the EZT 430i touch screen and all related control components away from AC power motor wiring and sources of direct heat output such as transformers heaters or large capacity resistors The EZT 430i touch screen provides an RS232C COM1 user communications port for connecting EZT 430i to a PC running software such as CSZ s Envision In order to connect EZT 430i to a PC a cable must be made according to the diagram below HR D sub 9 pin Female Connector Pinouts D sub 9 pin Female Connector Pinouts Description Pin Pin Description Im Seefe 3 fed tN a OE Ee EE ERR Po signal Ground NOTE DO NOT use a standard null modem cable to connect EZT 430i to a PC Most computers do not provide a standard serial port and a USB to serial converter must be used Incompatibilities may exist between EZT 430i and certain USB to serial adapters which will cause EZT 430i to malfunction when connected using a standard null modem cable If more than one EZT 430i controller is to be placed on the communication link with a PC an RS232 485 converter will be required for each EZT 430i and the PC in order to convert the RS232 communications port to RS485 multi drop communications network for connecting multiple EZT
38. int to 75 degrees 0x004B Sent 01 06 00 29 00 4B 18 35 Received 01 06 00 29 00 4B 18 35 Write Registers Command 0x10 4 8 CSZ EZT 430i Serial Communication EZT 430i Cincinnati Sub Zero This command writes values to multiple registers in sequential order It is used for automatic program download only to transmit program data one step at a time to EZT 430i See the Automatic Program Parameters section for the list of registers and their use If this command is used to write to registers other than the correct program step registers EZT 430i will respond with an acknowledgment that the message was received however the command will not be executed Packet sent to EZT 430i nn 10 nn nn nonn nn nnnn nnnn nn nn controller address 1 byte a write command 0x10 starting register high byte starting register low byte number of registers to write high byte number of registers to write low byte number of data bytes data high byte data low byte register n data high byte register n data low byte CRC low byte CRC high byte Packet returned from EZT 430i nn 10 nn nn np np annn controller address 1 byte write command 0x10 starting register high byte starting register low byte number of registers to write high byte number of registers to write low byte CRC low byte CRC high byte Exception Responses Serial Communication C
39. ith the EZT 430i controller Be sure that the model you purchase is designed for half duplex Another consideration when selecting an interface converter is how the converter handles switching between transmit and receive Typically it is accomplished via a handshake line from the PC When data flows into the converter from the PC a handshake line is placed high When data flows out of the converter to the PC the handshake line is placed low In this way the handshake line controls the direction of information Another method of achieving this is to use a built in timer The converter switches to transmit when a character is sent to it from the PC After a period of time when the PC has not transmitted the converter switches to a receive mode It is important that you understand how your converter accomplishes this task You are required to wire this feature or make settings on the converter to enable this function The PC will not talk to the controller correctly without properly setting this Your converter may also require settings through dip switches to set up communications parameters like baud rate data bits start bits stop bits and handshaking The converter may also require a separate power supply Some converters get their power from the handshake lines of the PC If you rely on this method you will need to wire these additional lines In addition your software must set these lines high A more reliable method is to use an external power
40. king to help detect data corruption that might occur during transmission There are several defined parity selections available for serial communications They are even parity odd parity mark parity space parity or none at all can be used When even or odd parity is being used the number of marks logical 1 bits in each data byte are counted and a single bit is transmitted following the data bits to indicate whether the number of 1 bits just sent is even or odd Mark parity means that the parity bit is always set to the mark signal condition and likewise space parity always sends the parity bit in the space signal condition Since these two parity options serve no useful purpose whatsoever they are almost never used When operating in the standard interface mode EZT 430i offers parity settings of Even Odd and None When operating in the simulated Watlow F4S D interface mode the parity is defaulted to None and is not adjustable In order for a device to communicate with EZT 430i it must have its serial port set to use the same parity setting in order for data communications to work properly Serial Communication CSZ EZT 430i 4 1 EZT 430i Cincinnati Sub Zero 4 1 Interface Standards An interface is a means for electronic systems to interact It s a specific kind of electrical wiring configuration It has nothing to do with how data is sent over that connection The two most common interfaces used today are RS 232 which provides a
41. lop an efficient means of transmitting and receiving messages Modbus is a structured protocol and it must be properly followed lt is recommended if possible to locate an existing communication driver to incorporate into your software Developing one from scratch can be challenging However if one is not available or you choose to develop one yourself the following guidelines may be of assistance Transmitting Messages When sending a message to EZT 430i it is important to remember that Modbus RTU protocol does not have start of transmission or end of transmission characters All messages are framed using timeouts between characters EZT 430i uses its own fixed timeout setting of 135ms Thus if the entire message is not received by EZT 430i within 135ms it will discard the data it has received and assume the next data byte received is the start of the next valid message The timeout must be considered carefully when developing your application In creating your message there are several steps that must be executed in order to build the packet and format the data properly into hexadecimal to send out the serial port of your PC If you write code in a manner that steps byte by byte through sending the message out the serial port formatting each piece of data prior to sending it there is a good possibility that two much time may pass between characters thus causing a failed transmission Therefore it is recommended that the entire messa
42. n on applying their software LabView by National Instruments Wonderware by Wonderware SpecView by SpecView Corporation 11500 N Mopac Expwy 26561 Rancho Pkwy South 13409 53 Ave NW Austin TX 78759 3504 Lake Forest CA 92630 Gig Harbor WA 98332 Phone 800 683 8411 Phone 949 727 3200 Phone 253 853 3199 http www natinst com http www wonderware com http www specview com If you already have a software application that uses Modbus you can simply skip to the EZT 430i parameter table in the Getting Started section for the information your program requires The rest of this section provides information on writing a software application that uses Modbus 1 You must code messages in eight bit bytes with even parity one stop bit 8 even 1 EZT 430i has its parity set to even as default from the factory 2 Negative parameter values must be written in twos complement format Parameters are stored in two byte registers accessed with read and write commands to a relative address 3 Messages are sent in packets that must be delimited by a pause at least as long as the time it takes to send 28 bits 3 5 characters To determine this time in seconds divide 28 by the baud rate In the case of EZT 430i communications at 9600 baud this caulates to a minimum period of 3ms In addition the EZT 430i timeout period must be added to that in order to properly time the send and receive messages between the host computer and multiple EZT 430i controll
43. nana nn nn cnc arrancan ranas 5 7 5 2 1 Starting an Automatic Program on EZT 430i u ccccccsccccesscseneeceeeeeceeeeesneeceeneeeseneetsaeseeneecseneetsneees 5 10 6 EZT 430i Simulated F4S D Interface Operation ccccccceesseeeeeeeeeeeeeeeeeeeeeeeeeeees 12 6 1 F4S D Supported Control Monitoring Data Registers ccceccceceeeeeeeeeeeeeeeeeeeeeeeaeseeeeeseaeeesaeeeeaaeeee 12 6 2 F4S D Supported Profile Step Data Heosters nan nnnnc cnn 17 6 2 1 Limitations of Profile Download Operation IMPORTANT Please Read coooococicccincccnoncciconnconn 19 6 2 1 1 Sending Profiles to EZT 4301 2 0 0 ccceececeeeceeeeeeeeeeeeee cece ee ceaeeeeaeeeeeeeeseaeeesaaesseeeeseeeeesaeeeeneeseaees 19 6 2 1 2 Setting Proper Step Times ooooonnnncinncccnncccconnnnnncncconcccnnnn nano nn nan cnn rca ranma narran cannnans 20 6 2 1 3 Setting Final SetpointS niinniin nc 20 6 2 1 4 Startingia Profile coo EENS 20 Table of Contents CSZ EZT 430i i EZT 430i Cincinnati Sub Zero 1 What is EZT 430i The EZT 430i system combines all of the features of a loop controller video chart recorder and data logging system into a single intuitive device Email SMS text messaging FTP file transfer protocol for automated data backup and remote view control Web server VNC server are standard with EZT 430i and can be accessed via LAN WAN using a PC tablet or smart phone device Future Designs EZT 430i provides a 4 3 color touch screen interface with sta
44. ncinnati Sub Zero 4 Serial Communication The user communications interface for EZT 430i employs serial communication which is the exchange of data in a one bit at a time sequential manner on a single data line or channel Serial contrasts with parallel communication which sends several bits of information simultaneously over multiple lines or channels Not only is serial data communication simpler than parallel it is also less costly Baud Rate The baud unit is named after Jean Maurice Emile Baudot who was an officer in the French Telegraph Service He is credited with devising the first uniform length 5 bit code for characters of the alphabet in the late 19th century What baud really refers to is modulation rate or the number of times per second that a line changes state This is not always the same as bits per second BPS However if you connect two serial devices together using direct cables then baud and BPS are in fact the same Thus if you are running at 9600 BPS then the line is also changing states 9600 times per second Typical baud rates used for computers are 300 600 1200 2400 4800 9600 14400 19200 38400 57600 and 115200 baud As the baud rate increases so does the transmission rate of data Thus you get more information in a shorter period of time However the faster the transmission rate the more susceptible it is to error due to the quality of the cable and sources of electrical noise in the environment When
45. ndard Smart Device user interface features for single and dual loop OEM control applications All loop configuration and runtime user access is configurable at the device with no PC software required OEM s have the ability to configure runtime features screen availability menus language etc to easily customize the system for their requirements These configurations can be imported exported to any other EZT 430i single dual loop device for setup from scratch within minutes Individual high performance board level PID loop control boards one for each loop offer up to four control outputs each powerful profiling capabilities with up to three events and full auto tune functionality with high resolution process inputs 1 1 Features Each of the EZT 430i loop control boards provide a single digital input that can be programmed as a automatic program control input for run hold or abort a manual mode or failure transfer control input or a program advance to next segment control input Each of the loop control boards also provide up to four control outputs which can be used as PID control outputs for heat cool direct outputs for controlling external equipment related to the application through software switches called events or be programmed to act as system alarm outputs EZT 430i can be operated in single set point or automatic program control mode Program entry is made easy through the use of copy paste and delete menu selections
46. nue doing this until all bytes of the command message have been processed The final contents of the CRC register is the CRC value When transmitting the CRC value in the message the upper and lower bytes of the CRC value must be swapped i e the lower order byte will be transmitted first 4 4 CSZ EZT 430i Serial Communication EZT 430i Cincinnati Sub Zero Example Cyclical Redundancy Checksum CRC Algorithm unsigned int ca_crc unsigned char start_of_packet unsigned char end_of_ packet unsigned int crc unsigned char bit_count unsigned char char_ptr Start at the beginning of the packet Char Dir start_of_packet Initialize CRC crc OxFFFF Loop through the entire packet do Exclusive OR the byte with the CRC crc unsigned int char_ptr Loop through all 8 data bits bit_count 0 dof If the LSB is 1 shift the CRC and XOR the polynomial mask with the CRC if cre amp Ox0001 crc gt gt 1 crc 0xA001 If the LSB is 0 shift the CRC only else crc gt gt 1 while bit_count lt 7 while char_ptr lt end_of_packet return crc Serial Communication CSZ EZT 430i 4 5 EZT 430i Cincinnati Sub Zero 4 3 Creating your own Modbus Application Listed below are a few of the more common software packages that claim to support the Modbus protocol This list is provided as informational only Contact the software manufacturer for more informatio
47. operating in the standard interface mode EZT 430i uses a 9600 baud rate When operating in the simulated Watlow F4S D mode EZT 430i uses a 19200 baud rate In order for a device to communicate with EZT 430i it must have its serial port set for either 9600 baud or 19200 baud based on the selected interface type in order for data communications to work properly Start and Stop Bits The start bit informs the receiving device that a character is coming and a stop bit tells it that a character is complete The start bit is always a 0 The stop bit is always a 1 The human speech equivalent of these bits could be a clearing of the throat to get someone s attention start bit and a pause at the end of a phrase stop bit Both help the listener understand the message A stop bit has a value of 1 or a mark state and it can be detected correctly even if the previous data bit also had a value of 1 This is accomplished by the stop bit s duration Stop bits can be 1 1 5 or 2 bit periods in length EZT 430i uses the default and most common length of 1 period for the stop bit A device used to communicate with EZT 430i must also have its serial port set to use a stop bit of 1 in order for data communications to work properly Parity Bit Besides the synchronization provided by the use of start and stop bits an additional bit called a parity bit may optionally be transmitted along with the data A parity bit affords a small amount of error chec
48. orted and restarted EZT 430i is automatically placed into program transfer mode when the first group of registers containing the program specific data is sent registers 100 113 EZT 430i then begins looking for the number of steps of the program to be sent as was set in register 106 As each step is received it increments the count Once all steps have been received EZT 430i downloads the program to the loop controller program memory During this transfer register 0 will be set to 1 to indicate that the process is taking place Once the register value returns to zero the automatic program is ready to be started If an error occurs during the transfer process from the PC to EZT 430i the program transfer process should be stopped at the PC The data sent to EZT 430i was either corrupted in transmission or not received properly It is not possible to resend the failed step because it is not known if any of the previous data was received by EZT 430i properly On the transmission error EZT 430i will enter a 15 second timeout process At the end of the timeout period the buffer will be cleared and the program can be resent In order to insure that the new download begins properly induce a 20 second wait period on the host PC after the failed transmission attempt to insure that enough time has elapsed 5 10 CSZ EZT 430i EZT 430i Data Registers standard serial interface OS EZT 430i Cincinnati Sub Zero Starting a Program 20 second pause
49. r other protocols of being extremely reliable in exchanging information This protocol works on the principle of packet exchanges The packet contains the address of the controller to receive the information a command field that says what is to be done with the information and several fields of data The last item sent in the packet is a field to ensure the data is received intact This is called a cyclic redundancy check sum See the following example for information on how to generate this value All information is exchanged in hex numbers EZT 430i only supports the binary version of Modbus referenced as RTU The ASCII version is less efficient and is not supported Therefore you must be certain to format all data in hexadecimal The CRC Cyclical Redundancy Checksum is caulated by the following steps 1 Load a 16 bit register called CRC register with OxFFFF 2 Exclusive OR the first 8 bit byte of the command message with the low order byte of the 16 bit CRC register putting the result in the CRC register 3 Shift the CRC register one bit to the right with MSB zero filling Extract and examine the LSB 4 If the LSB of the CRC register is zero repeat step 3 else Exclusive OR the CRC register with the polynomial value 0xA001 5 Repeat steps 3 and 4 until eight shifts have been performed When this is done a complete 8 bit byte will have been processed 6 Repeat steps 2 through 5 for the next 8 bit byte of the command message Conti
50. rial interface OS EZT 430i Cincinnati Sub Zero 5 1 Control Registers Data Range GC Parameter Description A B Type Low High Unit O 0x0000 System Offline Busy Status R KE K 1 0x0001 Alarm Reset R W 0 1 2 0x0002 Automatic Program Out of Sync Alarm R 1 3 0x0003 Loop Communication Alarm Status R ne be 4 0x0004 Loop Control Error Status R BS Ka 5 0x0005 Input Alarm Status R BA E 6 0x0006 7 0x0007 8 0x0008 9 0x0009 Control Loop Manual Override R W B5 10 0x000A Control Loop Autotune Activation R W GE 8 11 0x000B RESERVED DO NOT write to register 12 0x000C System Events R W 80 Ka 13 0x000D 14 0x000E Automatic Program Start Step Number R W 1 64 15 0x000F Automatic Program Operating Status R W Bg P9 16 0x0010 Program Name Characters 1 amp 2 R 89 17 0x0011 Program Name Characters 3 8 4 R 89 18 0x0012 Program Name Characters 5 8 6 R a 8 19 0x0013 Program Name Characters 7 amp 8 R B9 Ka 20 0x0014 Program Name Characters 9 amp 10 R KE E 21 0x0015 Program Name Characters 11 amp 12 R B9 ES p 22 0x0016 Program Name Characters 13 amp 14 R Bg B9 23 0x0017 Current Program Step R 1 64 24 0x0018 Total Number of Steps R 1 64 25 0x0019 Total Time of Step R 0 99 59 26 0x001A Time Remaining
51. sed upon loop configuration Do monitor alarm and event status use B10 Parameter a Value Description Bito Automatic Program Run Mode Bit1 Automatic Program Hold Mode registers 5 and 12 respectively EZT 430i Data Registers standard serial interface CSZ EZT 430i 5 5 EZT 430i Bit2 Static Mode Bit3 Auto Tune Mode Bit4 Manual Mode Bit5 Off Mode Bit6 Failure Transfer Bit7 Automatic Program Ramp Up Bit8 Automatic Program Ramp Down Bit9 Automatic Program Soak Bit10 Alarm 1 Active Bit11 Alarm 2 Active Bit12 Alarm 3 Active Bit13 Event 1 On Bit14 Event 2 On Bit15 Event 3 On B11 delia Description 0 No Error 4 Illegal Setup Values 10 Comm Error Bad Function Code 11 Comm Error Register Out of Range 14 Comm Error Write Read Only Data 15 Comm Error Out of Range Data 25 Holdback Time Out 26 Auto Tune Error 27 Input Type Requires Calibration 29 EEPROM Error 30 Cold Junction Failure 39 Sensor Break 40 A to D Failure B12 Parameter Deviation Process Value Alarm Alarm Range Low 18000 SP Lo Range High 18000 SP Hi 5 6 CSZ EZT 430i OS Cincinnati Sub Zero EZT 430i Data Registers standard serial interface EZT 430i Cincinnati Sub Zero C1 The units of measure and range of a loop input is dependant upon the configuration of the input and or the units of temperature selection Cel
52. sius or Fahrenheit of EZT 430i The decimal point position for the loop or monitor input is an implied value based on the configuration of the input Thus a register value of 345 can represent an actual process value of 345 34 5 3 45 or 0 345 depending upon the decimal point configuration of the loop or monitor input 5 2 Automatic Program Registers The automatic program parameters are a separate group of registers that are used to load programs into EZT 430i The manner in which the program steps are configured and sent to EZT 430i is specific and must be followed exactly Each program step consists of 14 data registers The program must be written one step at a time using a multiple write command 0x10 to write the data for all 14 registers at once This allows programs to be stored as two dimensional arrays of which code can be written to simply index through the array step by step and transmit the program file to EZT 430i The first 14 registers of the program contain specific settings related to the program These include hold back bands ramp units soak units the program name and the length of the program number of steps Register o Data f Range ie Address Parameter Description D E l Type Low High Unit 100 0x0064 Hold Back Band Loop 1 Ww El EI 101 0x0065 102 0x0066 Ramp Units Ww ES E2 j 103 0x0067 Soak Units W E3 E3 104 0x0068 Hold B
53. sponse messages can vary in length from as little as 5 bytes for an exception response to as many as 125 bytes for a read command Therefore in order to read in the message efficiently you need to know what type of command it is in response to The response messages are always coded with the first two bytes of the message as the controller address and command type When executing a read read in only the first 2 bytes of data at the serial port Examine the second byte and determine what the command is If it is a write command 0x06 or 0x10 you know the response message is 8 bytes long You can then read in the next 6 bytes of data from the serial port to complete the message You can then caulate the CRC for the first 6 bytes of that message and compare it to the last 2 bytes If they match then the communication completed successfully If the response is to a read command 0x03 you must then perform a single byte read from your serial port in order to get the next byte of the message The third byte in a read response message is the number of data bytes in the message By reading in this value you then know how many data bytes follow Note that this value does not include the 2 bytes for the CRC Thus when reading in the rest of the message you will read in the number of data bytes plus an additional two in order to get the CRC You can then caulate the CRC for the message and compare it to the last two bytes If they match the data you recei
54. st as there are different human cultural protocols that vary according to the situation The protocol portion of EZT 430i communications is very important because it provides a quality of communication that others often don t have Protocol driven communications are more accurate because they are less prone to both operator and noise errors Protocol maintains system integrity by requiring a response to each message It s like registered mail you know that your letter has been received because the post office sends you a signed receipt In EZT 430i data communications a dialog will continue successfully as long as the messages are in the correct form and responses are returned to the protocol leader If the operator enters an incorrect message or interference comes on to the data line there will be no response In that case the master must retransmit the message or go to a recovery procedure If an operator continues to enter an incorrect message or interference continues on the data line the system will halt until the problem is resolved EZT 430i uses Modbus RTU as the protocol of choice Modbus RTU enables a PC to read and write directly to registers containing the EZT 430i parameters With it you can read all of the controllers parameters with just a single read command Modbus Remote Terminal Unit RTU Gould Modicon now called AEG Schneider created this protocol for process control systems called Modbus It has the advantage ove
55. st be offset by 1 when writing step data to EZT 430i Steps 1 64 will be sent with the step number as a value of 0 63 1 offset All remaining steps of the program follow the same format and data structure as is represented for step one above Up to the following 882 registers are used to contain the additional step data of the program as required for steps 2 through 64 Since few if any programs will contain the maximum of 64 steps it is only necessary to write the step data for the number steps used in the automatic program 128 0x0080 141 0x008D Program Step 2 Data Registers 142 0x008E 155 0x009B Program Step 3 Data Registers 156 0x009C 169 0x00A9 Program Step 4 Data Registers 170 0x00AA 183 0x00B7 Program Step 5 Data Registers 184 0x00B8 197 0x00C5 Program Step 6 Data Registers 198 0x00C6 211 0x00D3 Program Step 7 Data Registers 212 0x00D4 225 0x00E1 Program Step 8 Data Registers 226 0x00E2 239 Ox00EF Program Step 9 Data Registers 996 0x03E4 1009 0x03F 1 Program Step 99 Data Registers Notes DW Specifies write only data 5 8 CSZ EZT 430i EZT 430i Data Registers standard serial interface EZT 430i EI Parameter Temperature Temperature Process Value Units C Units F Units Range Low 1 1 1 Range High 555 999 999 EZ Parameter Se Valls Description 0
56. t 56 0x0038 Alarm 6 Setpoint R W e Ble ei 57 0x0039 58 0x003A so oxoss ITT TI I Notes A R W Specifies readable writable data R specifies read only data and W specifies a write only control value B The range of certain parameters are dependent upon system options Consult the following range tables for information regarding the use of these parameters Reading bit oriented parameters The value contained in these parameters is dependant upon the combination of on bits 1 Therefore only the individual status of each bit has meaning not the value of the parameter Setting bit oriented parameters The value that must be written to these parameters is dependant upon the combination of on bits Therefore it is necessary to know the current value of the parameter before setting it so that only the bit status you want to update is changed Otherwise sending a value derived from only the bit you wish to set will turn off all other functions related to the other bits in the parameter EZT 430i Data Registers CSZ EZT 430i 5 3 standard serial interface Les EZT 430i Cincinnati Sub Zero B1 Parameter Description The status of this register should be used for information only as a Value P means of determining if the system is ready for operation 0 EZT 430i Online 1 Offline Program Download in Progress B2 Parameter e Value Description BitO Loop 1 Communications Error Bi
57. t1 Loop 2 Communications Error Bit2 Bit15 Not Assigned B3 Parameter Description Note If either bit is on check the corresponding loop mode and Value operational status register to determine the cause for the alarm Bito Loop 1 Control Error Bit1 Loop 2 Control Error Bit2 Bit15 Not Assigned B4 deta Description BitO Alarm 1 Active Bit1 Alarm 2 Active Bit2 Alarm 3 Active Bit3 Alarm 4 Active Bit4 Alarm 5 Active Bit5 Alarm 6 Active Bit6 Bit15 Not Assigned B5 Parameter Description Note When loop is in manual mode the loop percentage of output can Value be set by writing to the corresponding loop percent output register Bito Loop 1 Manual Mode Bit1 Loop 2 Manual Mode Bit2 Bit15 Not Assigned B6 Parameter Description Note Auto tune may not be available depending upon the loop Value configuration If auto tune operation is not available the bit for the loop will automatically turn off after being set Bito Loop 1 in Auto Tune When auto tune completes normally the bit for the loop will 5 4 CSZ EZT 430i automatically turn off indicating that tune is complete To terminate an auto tune in progress turn off the bit for the desired loop EZT 430i Cincinnati Sub Zero Bit1 Loop 2 in Auto Tune Bit2 Bit15 Not Assi
58. tion of your nCompass Note DO NOT enable holdback for a loop that does not have hold back enabled in the configuration seen on the program Entry screen If holdback is set but not enable din the configuration only the loop with holdback set will enter hold mode and cause the program to get out of sync between the loops resulting in a automated program run error EZT 430i Cincinnati Sub Zero Te Description 0 Holdback Disabled 1 Deviation Low Holdback 2 Deviation High Holdback 3 Deviation Band Holdback E The unit PV means that the unit of the parameter is the same as the unit of PV the loop configuration Use caution when loading an automatic program to EZT 430i You must insure that the decimal point scaling and units of measurement in the program match the loop setting Loading a program with a temperature setpoint of 80 will result in a control temperature of 80 F if the EZT 430i control is in degrees Fahrenheit However if the EZT 430i control is set for degrees Centigrade it will result in a control temperature of 80 C 176 F 5 2 1 Starting an Automatic Program on EZT 430i Automatic programs are sent to EZT 430i in a step by step process The download sequence must be followed in proper order and must complete without errors to be valid If a write error is detected during the transfer of a program from a PC to EZT 430i no response from EZT 430i or NACK returned the program download must be ab
59. ure and range of an input is dependant upon the configuration of the input and or the units of temperature selection Celsius or Fahrenheit of EZT 430i The decimal point position for the input is an implied value based on the decimal point selection for the input Thus a register value of 345 can represent an actual process value of 345 34 5 3 45 or 0 345 depending upon the decimal point configuration of the input 6 2 F4S D Supported Profile Step Data Registers The following table of data registers provides the list of all data registers associated with downloading profiles to a Watlow F4S D Not all of the F4S D functionality is provided by EZT 430i so registers that are shown grayed out in the list represent those functions NOT supported by the EZT 430i automatic program operation EZT 430i is compatible with the profile editor of WatView or any other software that follows the proper sequence for downloading profiles to an F4 When a profile is downloaded to EZT 430i it will automatically ignore the non supported functions so a special profile editor is not required For the proper method of downloading profiles to an F4 controller reference the Profile Programming Procedures in section 7 Communications of the Watlow F4S D User Manual Data Range Register Address Parameter Description D E F Type Low High Unit 4000 0x0FA0 Profile Number R W 1 1 4001 0x0FA1 Profile Step Number W 1 64
60. ut 1B Status R 0 100 00 111 0x006F Power Output 2A Status R 100 00 115 0x0073 Power Output 2B Status R 0 100 00 200 0x00C8 Operation Mode Status R B3 BS 300 0x012C Set Point 1 Value R W 32768 32767 Ci 302 0x012F Alarm Low Set Point and Deviation Alarm 1 R W P eS KE 303 0x0130 Alarm High Set Point and Deviation Alarm 1 R W BA Ke Si 305 0x0131 Autotune Channel 1 R W B5 B3 A 12 CSZ EZT 430i Operation Les EZT 430i Cincinnati Sub Zero Data Range C Register Address Parameter Description A B Type Low High Unit 311 0x0137 Clear Error 1 Key Press Simulation W ZE B6 312 0x0138 Clear Alarm 1 Key Press Simulation W one ES 313 0x0139 Silence Alarm 1 Key Press Simulation W B6 BG 319 0x013F Set Point 2 Value R W 32768 32767 Ki 321 0x0141 Alarm Low Set Point and Deviation Alarm 2 R W Ba C1 322 0x0142 Alarm High Set Point and Deviation Alarm 2 R W DA Ba Ka 324 0x0144 Autotune Channel 2 R W JS Ei 330 0x014A Clear Error 2 Key Press Simulation W Ka RK 331 0x014B Clear Alarm 2 Key Press Simulation Ww 28 B6 332 0x014C Silence Alarm 2 Key Press Simulation W B6 B6 602 0x025A Set Point Low Limit Analog Input 1 R 32768 32767 Kc 603 0x025B Set Point High
61. ved is valid Serial Communication CSZ EZT 430i 4 11 Les Cincinnati Sub Zero EZT 430i Read 2 bytes from serial port and check value of second byte Read Write Exception Command NO Command NO Response 0x03 0x06 10 0x8_ YES YES YES Read 1 byte from serial port and obtain number of data bytes in message Read remaining 8 bytes from serial port to obtain complete message Read remaining 3 bytes from serial port to obtain complete message Read in number of data bytes from message plus 2 additional CRC bytes Caulate the CRC for the message and compare to CRC received Received message is valid If the message was a read response the data can be extracted and converted for use within the software Was it an exception response If the message was a write response EZT 430i executed the command YES NO Enter recovery mode and resend command message in Disregard message attempt to get valid response and or alert operator of a transmission error communication failure in order to take appropriate action 4 12 CSZ EZT 430i Serial Communication EZT 430i Cincinnati Sub Zero 5 EZT 430i Data Registers standard serial interface Some of the values contained in the EZT 430i register base contain bit oriented values This means that each bit of the word indicates an on off status for a specific setting or condition In handling these values it is recommended

EZT-430i - Environmental Test Chambers from Cincinnati Sub-Zero

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