Omega Engineering Omega CN8240 User's Manual
Contents
1. Three remote communications options are available for the CN8240 CN8260 which allow interfacing to remote devices utilizing the most common industry standards RS232 and RS485 Call factory for a recommended RS485 converter CN8240 amp CN8260 Series Communications amp Options Digital Communications Option Omega Protocol The Omega Protocol provides an easy way to query and modify controller parameters using a personal computer and the optional digital communications option of the 18C 25C In this manual the word host refers to the personal computer that s communicating with the controllers in the serial link and the word slave refers to the controllers themselves All transactions between the host and the slaves are done with messages consisting of only printable ASCII charac ters There are only two primary types of messages Requests and Responses Messages coming from the host are called requests and messages coming from the slaves are called responses With the exception of a broadcast request for every request sent from the host the slave will send back a response If a slave does not respond within 100 milliseconds then the request can be considered lost A broadcast request is a request having an ID of 00 see Message Formats below It is used to address all slaves on the network All slaves on the network will perform the actions requested in a broadcast message However a response messa2. Relay N O Alarm Output RS 232 Communications RS 485 Communications Transducer Excitation Auxiliary Output Remote Analog Setpoint Guide to Digital Communications Remote Communications Options Omega Protocol e Message Formats e Sample Commands e Request Messages Response Messages Communications Parameter List CN8240 amp CN8260 Series Communications amp Options Relay N 0 Alarm Output SS Option AL1 AL2 Relay N O Alarm Output he OUTPUT 2 IE 3 4 14 e m E Q 5 15 2D 6 16 Z mr LEE te D E pply voltage D D SOS L1 120 250 V 50 60 Hz Option Description NO Normally open relay contact is closed when either alarm is active The relay life is greater than 100 000 operations at 5 operations per second switching full load Connect load and supply voltage per the following table Load Type 5 A Voltage Limit Resistive dc Inductive ac L R 7 ms Resistive ac Inductive ac pF 0 4 Motor ac 1 6 hp Tungs
3. Read Command Checksum Controller ID Data 0101R0502 0000J7 CR Start of Message Parameter Number Zone Number End of Message WRITE COMMAND TO CONTROLLER Write Command Checksum Controller ID r Data 0101W1025 000G7 lt CR gt y Start of Message Parameter Number End of Message Zone Number CN8240 amp CN8260 Series Communications amp Options Digital Communications Option A WRITE RESPONSE FROM CONTROLLER Write Command Checksum Controller sal 30101W090H8 lt CR gt i Start of Message Parameter Number Zone Number End of Message AUXILIARY COMMAND TO CONTROLLER Auxiliary Command Data Checksum Controller ID 0101A020 0000000067 lt CR gt 1 Start of Message Parameter Number End of Message one Number AUXILIARY RESPONSE FROM CONTROLLER Auxiliary Command Checksum Controller ID No Error 0101A020E9 CR Start of Message Parameter Number Zone Number End of Message 10 CN8240 amp CN8260 Series Communications amp Options Digital Communications Option RIETI The Read Request The Read Request is used to query parameter values and it has the following message format START CHAR ID ZONE TYPE PARAM CHKSUM END CHAR Field Description TYPE Must contain the uppercase letter R Request Message Description 0101R05C1 lt CR gt Queries the value of th
4. gt dom Remote analog setpoint Remote analog setpoint Switch input only voltage current input potentiometer with enable switch Option Description Remote setpoints use either voltage or current inputs depending on the specified option Option DIC Switch Input Closed Option RSP4 0 5 Vdc Option RSP5 1 5 Vdc Option RSP6 0 20 mA Option RSP7 4 20 mA The input signal is scalable in the Remote Analog Setpoint Menu Activation of the analog setpoint causes the F1 indicator to illuminate For current mA options the input resistance is 255 ohms For voltage input options the input resistance is greater than 10K ohms Note Switch input option DIC is active when switch is closed The digital input option menu controls the programming of this switch Ground shield at one end taking care not to run wires next to power circuitry Maximum length will be determined by noise performance CN8240 amp CN8260 Series Communications amp Options omega com CEOMEGA CN8240 CN8260 Series Controllers with Digital Communications Option CN8240 amp CN8260 Series Communications amp Options Digital Communications Option SS ee Remote Communications Options RS 232 This method allows bidirectional data transfer via a three conductor cable consisting of signal ground receive input and transmit output It is recommended for communication distances less than 50 feet between the computer termi nal and the i
5. 5 All options will provide at least 20 mA The transducer circuitry is thermally protected from short circuits CN8240 amp CN8260 Series Communications amp Options Process Output aaa eae Options PVSV1 PVSV2 Process Output P PA RISE ed RA Option PVSV2 0 5 V o a gt Option PVSV1 4 20 mA senson W o wa INPUT me aro o Option Description The Setpoint Variable or Process Variable is transmitted to a remote device chart recorders indicators data recorders computers process controllers etc with 1 of 2 different interfaces Option PVSV1 4 20 mA Option PVSV2 0 5 V The output signal is scalable in the Auxiliary Output Menu Multiple remote indicators may be driven by the controller For current mA options the remote indicators are connected in series The sum of the input resistance for all remote indicators must be less than 400 ohms For voltage options the remote indicators are connected in parallel The sum of the currents for all remote indicators must be less than 10 mA Remote Setpoint Options pto Options DIC RSP4 RSP5 RSP6 RSP7 Remote Setpoint Options RSPA RSP5 RSP6 RSP7 Option DIC EP 24 o 24 12 0 5 V 1 5 V 0 10 V 2 0 20 mA 4 20 mA 13 1 dl Enable M 15 Switch 15 T a a Enable Switch pacoon 17 16 16 8 18 LON v 2
6. E9 TC Zero Calibration X X FO TC Span Calibration X X FA RTD Zero Calibration X X F2 RTD Span Calibration X X F3 Low Voltage Zero Calibration X X F4 Low Voltage Span Calibration X X F5 High Voltage Zero Calibration X X 20 CN8240 amp CN8260 Series Communications amp Options Digital Communications Option Table 1 Continued Number Name Read Write Data Field Value F6 High Voltage Span Calibration X X F7 Current Zero Calibration X X F8 Current Span Calibration X X G1 Auxiliary Output Variable X X G2 Auxiliary Output Scale Low X X G3 Auxiliary Output Scale High X X G5 RAS Scale Low X X G6 RAS Scale High X X G7 Contact Digital Switch X X 1 Disabled 2 Second Setpoint Select 3 Standby Select 4 Run Hold Switch H2 Autotune State X 0 0 Success 1 Aborted 2 Error No PID Output 3 Error No Deviation 4 Error No Output 5 Error Timed out 6 Error Bad Tune 7 Waiting for PV to settle 8 Reverse Tune In Progress 9 Direct Tune In Progress H3 Recipe State X 0 H5 Current Recipe Statement X 0 H6 Active Setpoint X X H7 Resume Exhaustion Flag X 0 H8 LED Status Indicator X 0 H9 RTD Decimal Zero Calibration X X 10 RTD Decimal Span Calibration X X 11 1 5 V 0 10 V Zero Calibration X X 12 1 5 V 0 10 V Span Calibration X X 13 10 050 mV 0 100 mV Zero Calibration X X 14 10 50 mV 0 100 mV Span Calibration X X 21 CN8240 amp CN8260 Series Communications amp Options Digital C
7. A Of Course TEMPERATURE Thermocouple RTD amp Thermistor Probes Connectors Panels amp Assemblies Wire Thermocouple RTD amp Thermistor Calibrators amp Ice Point References Recorders Controllers amp Process Monitors Infrared Pyrometers PRESSURE STRAIN AND FORCE Transducers amp Strain Gages Load Cells amp Pressure Gages Displacement Transducers Instrumentation amp Accessories FLOW LEVEL Rotameters Gas Mass Flowmeters amp Flow Computers Air Velocity Indicators Turbine Paddlewheel Systems Totalizers amp Batch Controllers pH CONDUCTIVITY pH Electrodes Testers amp Accessories Benchtop Laboratory Meters Controllers Calibrators Simulators amp Pumps Industrial pH amp Conductivity Equipment DATA ACQUISITION Data Acquisition amp Engineering Software Communications Based Acquisition Systems Plug in Cards for Apple IBM amp Compatibles Datalogging Systems Recorders Printers amp Plotters HEATERS Heating Cable Cartridge amp Strip Heaters Immersion amp Band Heaters Flexible Heaters Laboratory Heaters ENVIRONMENTAL MONITORING AND CONTROL Metering amp Control Instrumentation Refractometers Pumps amp Tubing Air Soil amp Water Monitors Industrial Water amp Wastewater Treatment pH Conductivity amp Dissolved Oxygen Instruments
8. CN8240 amp CN8260 Series Communications amp Options omega com EOMEGA www omega com e mail info omega com CN8240 amp CN8260 SERIES Communications amp Options Guide User s Guide Qu CN8240 amp CN8260 Series Communications amp Options omega com OMEGAnet On Line Service www omega com Internet e mail info omega com Servicing North America USA ISO 9001 Certified One Omega Drive Box 4047 Stamford CT 06907 0047 Tel 203 359 1660 FAX 203 359 7700 e mail info omega com Canada 976 Bergar Laval Quebec H7L 5A1 Tel 514 856 6928 FAX 514 856 6886 e mail info omega ca For immediate technical or application assistance USA and Canada Sales Service 1 800 826 6342 1 800 TC OMEGA Customer Service 1 800 622 2378 1 800 622 BEST Engineering Service 1 800 872 9436 1 800 USA WHEN TELEX 996404 EASYLINK 62968934 CABLE OMEGA Mexico Tel 001 800 826 6342 FAX 001 203 359 7807 En Espa ol 001 203 359 7803 e mail espanol omega com Servicing Europe Benelux Postbus 8034 1180 LA Amstelveen The Netherlands Tel 31 20 6418405 FAX 31 20 6434643 Toll Free in Benelux 0800 0993344 e mail nl omega com Czech Republic Rud arm dy 1868 733 01 Karvina 8 Tel 420 69 6311899 FAX 420 69 6311114 Toll Free 0800 1 66342 e mail czech omega com France 9 rue Denis Pap
9. ESSING DELAYS The assigned AR number should then be marked on the outside of the return package and on any correspondence The purchaser is responsible for shipping charges freight insurance and proper packaging to prevent breakage in transit FOR WARRANTY RETURNS please have the FOR NON WARRANTY REPAIRS consult OMEGA following information available BEFORE contacting for current repair charges Have the following OMEGA information available BEFORE contacting OMEGA 1 Purchase Order number under which the 1 Purchase Order number to cover the COST product was PURCHASED of the repair 2 Model and serial number of the product under 2 Model and serial number of the product and warranty and 3 Repair instructions and or specific problems 3 Repair instructions and or specific problems relative to the product relative to the product OMEGAS policy is to make running changes not model changes whenever an improvement is possible This affords our customers the latest in technology and engineering OMEGA is a registered trademark of OMEGA ENGINEERING INC Copyright 2008 OMEGA ENGINEERING INC All rights reserved This document may not be copied photocopied reproduced translated or reduced to any electronic medium or machine readable form in whole or in part without the prior written consent of OMEGA ENGINEERING INC Where Do I Find Everything Need for Process Measurement and Control 900M 124U00B OMEG
10. R gt Change both the RAM and EEPROM copies of Setpoint 1 in controller 1 to the value of 10 123 0101w1010 123J1 CR Change only the RAM copy of setpoint 1 T in controller 1 to the value of 10 123 notice the lowercase w END CHAR CHKSUM DATA PARAM TYPE ZONE ID START CHAR 12 CN8240 amp CN8260 Series Communications amp Options Digital Communications Option The Auxiliary Command Request The Auxiliary Command Request is used to issue commands to the controllers and it has the following message format Field Description TYPE This field must contain the uppercase letter A DATA Aten character ASCII representation of a numeric value or 10 alphanumeric ASCII characters Request Message Description 0101 AQ1XXXXXXXXXXL2 lt CR gt Tell controller 1 to load all parameters with their defaults The 10 X s are padding characters 0201A020001 0000069 CR Tell controller 2 to perform a low T I RTD calibration END CHAR CHKSUM DATA PARAM TYPE ZONE ID START CHAR Response Messages Response Messages are replies to the requests sent from the host For each request received the slave will reply back with a response For all requests the Omega Protocol specifies a maximum response time of 100 milliseconds If the controller does not start responding within 100 milliseconds after the last req
11. THAT OF TITLE AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED LIMITATION OF LIABILITY The remedies of purchaser set forth herein are exclusive and the total liability of OMEGA with respect to this order whether based on contract warranty negligence indemnification strict liability or otherwise shall not exceed the purchase price of the component upon which liability is based In no event shall OMEGA be liable for consequential incidental or special damages CONDITIONS Equipment sold by OMEGA is not intended to be used nor shall it be used 1 as a Basic Component under 10 CFR 21 NRC used in or with any nuclear installation or activity or 2 in medical applications or used on humans Should any Product s be used in or with any nuclear installation or activity medical application used on humans or misused in any way OMEGA assumes no responsibility as set forth in our basic WARRANTY DISCLAIMER language and additionally purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product s in such a manner RETURN REQUESTS INQUIRIES Direct all warranty and repair requests inquiries to the OMEGA Customer Service Department BEFORE RETURNING ANY PRODUCT S TO OMEGA PURCHASER MUST OBTAIN AN AUTHORIZED RETURN AR NUMBER FROM OMEGA S CUS TOMER SERVICE DEPARTMENT IN ORDER TO AVOID PROC
12. X X B4 Output 2 Low Limit X X B5 Output 2 High Limit X X B6 TC RTD Decimal Position X X B7 Linear Decimal Position X X B8 Display Filter X X B9 Display Units X X 1 Fahrenheit 2 Celsius 3 Kelvin C1 Display Blanking X X C2 Alarm 1 Action 1 Off 2 Normal 3 Latched 4 Event C3 Alarm 1 Operation X X 1 Process High 2 Process Low 3 Deviation High 4 Deviation Low 5 Normal Band 6 Inverse Band C4 Alarm 1 Delay X X C5 Alarm 1 Inhibit X X C6 Alarm 1 Process Setpoint X X C7 Alarm 1 Deviation Setpoint X X C8 Alarm 2 Action X X 1 Off 2 Normal 3 Latched 4 Event C9 Alarm 2 Operation X X 1 Process High 2 Process Low 3 Deviation High 4 Deviation Low 5 Normal Band 6 Inverse Band 19 CN8240 amp CN8260 Series Communications amp Options Digital Communications Option EE Table 1 Continued Number Name Read Write Data Field Value DO Alarm 2 Delay X X D1 Alarm 2 Inhibit X X D2 Alarm 2 Process Setpoint X X D3 Alarm 2 Deviation Setpoint X X D4 Communications Protocol X 0 1 Omega 05 Communications ID X X D6 Baud Rate X X 0 75 1 150 2 300 3 600 4 1200 5 2400 6 4800 7 9600 D7 Data Format X X 0 7 0 1 1 7 E 1 2 7 N 2 3 7 0 2 4 7 E 2 5 8 N 1 6 8 0 1 7 8 E 1 8 8 N 2 D8 Communications Transmit Delay X X El Output 1 Failsafe X X E2 Output 2 Failsafe X X E3 Loop Break Time X X E4 Highest Reading X X E5 Lowest Reading X X E8 Option Selection X 0 1 Comm Option
13. e Process Variable of Controller 1 0101R 9C5 lt CR gt Queries the value of the EEPROM Setpoint 1 of Controller 1 0201 R09C6 CR Queries the value of the EEPROM Lo Setpoint 1 of Controller 2 END CHAR CHKSUM PARAM TYPE ZONE ID START CHAR Request Messages are sent from the host to the slaves Each request will have an ID identifying the intended recipient of the request If the ID is 00 zero then the request is a broadcast message All slaves will perform the action requested in the broadcast request However a response message will not be returned Therefore it only makes sense to send Write or Auxiliary Command Requests as broadcast requests There are three types of Request Messages Read Write and Auxiliary Commands Examples of the responses to these requests are given in later sections on Response Messages 11 CN8240 amp CN8260 Series Communications amp Options Digital Communications Option eee The Write Request The Write Request is used to modify parameter values and it has the following message format START CHAR ID ZONE TYPE PARAM DATA CHKSUM END CHAR Field Description This field must contain one of the following two characters W Value in DATA is a positive value w Value in DATA is a negative value DATA A six character ASCII representation of a numeric value Request Message Description 9191W9919 123G7 lt C
14. e X 0 6 Operating Mode X X 1 Manual 2 Standby 3 Normal automatic 4 Initiate Autotune 5 Recipe Run 6 Recipe Hold 7 Access Level X X 1 Lockout 2 Setpoint 3 Setpoint Plus 4 User 5 Configuration 6 Factory 8 Contact Digital Input State X 0 0 Switch Open 1 Switch Closed 9 Setpoint RAM EEPROM 10 Setpoint RAM Only 11 Second Setpoint RAM EEPROM X X 12 Second Setpoint RAM only X X 13 Remote Analog Setpoint X 0 14 Recipe Setpoint X 0 16 Output 1 Percentage X 0 1 Output 2 Percentage X 0 18 Manual Control Output 1 Percentage X X 19 Manual Control Output 2 Percentage X X 20 Output 1 Deadband X X 21 Output 1 Hysteresis X X 22 Output 1 Proportional X X Band 23 Output 2 Proportional X X Band 30 Rate Derivative Value X X 32 Reset Integral Value 34 Manual Reset Integral Value 37 Output 2 Deadband 38 Output 2 Hysteresis 16 CN8240 amp CN8260 Series Communications amp Options Digital Communications Option EE Table 1 Continued Number Name Read Write Data Field Value 39 Autotune Damping X X 1 Low 2 Normal 3 High 40 Recipe Option X X 0 Disabled X X 1 Single Step X X 2 Multi Step 41 Single Setpoint X X Ramp Time 42 49 Ramp Times 1 8 X X 50 57 Ramp Events 1 8 X X 0 Disabled 1 Event 1 On 2 Event 1 Off 3 Event 2 On 4 Event 2 Off 58 65 Soak Levels 1 8 X X 66 73 Soak Times 1 8 X X 74 81 Soak Events 1 8 X X 0 Disabled 1 Event 1 On 2 Event 1 Off 3 Even
15. ge will not be returned Therefore the host can only broadcast Write or Auxiliary Command Requests All slaves will ignore all Read Broadcast Requests Message Formats All Omega messages adhere to the general format of START CHAR ID ZONE TYPE PARAM ERROR DATA CHKSUM END CHAR START CHAR This is a single character which designates the start of the message For a Request message this character is the ASCII and for a Response message this character is the ASCII ID This is a two character ID identifying the receiving controller Controller IDs go from 1 255 inclusively and all slaves in the network must have unique IDs The ID number of 00 when used in a request designates a broadcast mes sage that is used to address all controllers in the network See the section Request Message for an explanation of the broadcast message In order to represent 255 with just two ASCII characters a number system known as the Message Code Numbering System is used In this system the most significant digit is represented with the numbers 0 9 and the letters A Z and the least significant digit is represented with the numbers 0 9 The numbers 0 9 have the same values as their decimal counterparts and the letters A Z have the values of 100 50 inclusively in increments of 10 Example Message Code Value Decimal Value 00 0 0 00 99 90 9 99 A0 100 0 100 A2 100 2 102 B8 110 8 118 P5 250 5 255 Zone T
16. his is a two character ID identifying the Zone number in multi zone capable controllers For the 18C 25C this num ber must be 01 CN8240 amp CN8260 Series Communications amp Options Digital Communications Option ee Type This is a single character identifying the type of message The following table lists the type characters for all messages TYPE character Message Type R Read Request or Read Response Returning a Positive Result r Read Response Returning a Negative Result W Write Positive Value Request and Response w Write Negative Value Request and Response A Auxiliary Command For further information see following sections on the different message types PARAM This is a two character message specific parameter ID For a Read Write Request or Response message this ID identifies the controller parameter For an Auxiliary Command Request or Response message this ID specifies the command ERROR Code Description 0 No error 1 Framing error 2 Hardware error 3 Parity error 4 Bad character in the TYPE field 5 Bad message Message cannot be understood 6 Bad checksum The checksum received did not match the checksum of the message 7 Bad zone ID 8 Bad auxiliary command ID The auxiliary command is not supported in this controller 9 Bad parameter ID The parameter is not supported in this controller A Bad data Bad representation in the data field or data is out of range B Attempt
17. iary Command Response The Auxiliary Command Response will be sent in response to an Auxiliary Command Request Some examples are Request Message Description 0101 010 4 lt gt 0201A0200 00000000B6 lt CR gt Ir Default load all parameters has started RTD low calibration on controller 2 has started END CHAR CHKSUM DATA STATUS PARAM TYPE ZONE ID START CHAR Table 1 Communications Parameter List Omega Protocol Number Name Read Write Data Field Value 1 Controller Type X 0 3 2 Software Version X 0 3 Communications Version X 0 4 Status Byte X 0 This field contains the ASCII CN8240 CN8260 Parameter Codes X s mark parameters that are supported by the CN8240 and CN8260 and O s indicate parameters that are not supported representation of an 8 bit value in which the bit assignments are as follows starting from the least significant bit X Process Input Error X RAS Error 0 Always Zero X Loop Break X Alarm 1 Active X Alarm 2 Active 0 Always Zero 0 Always Zero If a bit at a location marked as X is set then the condition is TRUE For example a 48 000 in the data field means that both alarm 1 and alarm 2 are active and everything else is FALSE CN8240 amp CN8260 Series Communications amp Options Digital Communications Option Table 1 Continued Number Name Read Write Data Field Value 5 Process Valu
18. in 78190 Trappes Tel 33 130 621 400 FAX 33 130 699 120 Toll Free in France 0800 4 06342 e mail france omega com Germany Austria Daimlerstrasse 26 D 75392 Deckenpfronn Germany Tel 49 07056 3017 FAX 49 07056 8540 Toll Free in Germany 0800 TC OMEGA e mail germany omega com United Kingdom ISO 9002 Certified One Omega Drive River Bend Technology Centre Northbank Irlam Manchester M44 5EX England Tel 44 0 161 777 6611 FAX 44 0 161 777 6622 Freephone 0800 488 488 e mail sales omega co uk It is the policy of OMEGA to comply with all worldwide safety and EMC EMI regulations that apply OMEGA is constantly pursuing certification of its products to the European New Approach Directives OMEGA will add the CE mark to every appropriate device upon certification The information contained in this document is believed to be correct but OMEGA Engineering Inc accepts no liability for any errors it contains and reserves the right to alter specifications without notice WARNING These products are not designed for use in and should not be used for patient connected applications CN8240 amp CN8260 Series Communications amp Options Table of Contents For information and instructions related to basic operations refer to the CN8240 CN8260 operators manual supplied with your controller Option Wiring Diagrams Alarm voce sspe be Ere RR Rs 24 Volt DC Alarm Output
19. nstrument Note Multiple instruments cannot be connected to the same port The RS232 port is optically isolated to eliminate ground loop problems Typically Data Out of the computer terminal connects to the RCV terminal Data In connects to the XMT terminal If shielded cable is used it should be connected to the frame ground at one end only Signal ground is to be connected at appropriate ground terminals refer to wiring diagram on bottom of this page RS 485 The RS485 multipoint capability allows up to 32 controllers to be connected together in a half duplex network or up to 100 controllers with an appropriate communications repeater This method allows bidirectional data transfer over a twisted pair cable The twisted pair cable is a transmission line therefore terminating resistors are required at the most distant ends of the line to minimize reflections typically 120 ohms at each end The RS485 circuit is fully optically isolated eliminating ground loop problems Parallel drops from the transmission lines should be kept as short as possible however the line may be daisy chained at each controller The polarity of the line is important and each device will specify an A and B connection Figure 1 Wiring diagram for digital communications DIGITAL COMMUNICATIONS RCV XMT SIGGND RS 232 BC SIGGND Rs 485 2172 2 De 3 13 2 14 15 2 16 ISS
20. ommunications Option SS A Command Parameter Description Request Data Field Response Data Field Command Parameter Description Auxiliary Commands Load Parameter Defaults 01 Restore all menu parameters to their default values Ignored Ignored Perform Process Low Calibration 02 Performs a Low Calibration The data field in the request message specifies the process Make sure the prerequisite for the calibration is satisfied before issuing a calibration command For instance the RTD calibration command must only be used when the input sensor type is chosen as RTD or RTD w Decimal 22 CN8240 amp CN8260 Series Communications amp Options Digital Communications Option gt Request Data Fields Response Data Field Command Parameter Description Request Data Field Command Parameter Description Request Data Field Response Data Field Command Parameter Description Request Data Field Response Data Field A 10 character ASCII representation of a numeric value specifying what to calibrate 0 Thermocouple 1 RTD Resistive Thermal Device 2 Linear 3 RAS Remote Analog Setpoint Ignored Perform Process High Calibration 03 Performs a High Calibration The data field in the request message specifies the process Make sure the prerequisite for the calibration is satisfied before issuing a calibration command For instance the RTD calib
21. ration command must only be used when the input sensor type is chosen as RTD or RTD w Decimal A 10 character ASCII representation of a numeric value specifying what to calibrate 0 Thermocouple 1 RTD Resistive Thermal Device 2 Linear 3 RAS Remote Analog Setpoint Retrieve Display 05 Retrieves the string currently displayed on the slave s display The data field in the request message specifies which display and the data field in the response message contains the string A 10 character ASCII representation of a numeric value specifying which display to retrieve data from 0 Lower Display 1 Upper Display The ASCII string Clear Latched Alarms 10 Clear all latched alarms Ignored Ignored 23 CN8240 amp CN8260 Series Communications amp Options Notes 24 CN8240 amp CN8260 Series Communications amp Options Notes 25 CN8240 amp CN8260 Series Communications amp Options Notes 26 MADE IN USA WARRANTY DISCLAIMER OMEGA ENGINEERING INC warrants this unit to be free of defects in materials and workmanship for a period of 25 months from date of purchase OMEGA s Warranty adds an additional one 1 month grace period to the normal two 2 year product warranty to cover handling and shipping time This ensures that OMEGAS customers receive maxim
22. t 2 On 4 Event 2 Off 82 Recycle Number X X 83 Holdback Band X X 84 Termination State X X 0 Last Setpoint 1 Default Setpoint 2 Recipe to Standby Mode 85 Power Fail Resume X X 1 Resume Off Enable 2 Resume On 86 Input Bias X X 87 Input Low Scale X X 88 Input High Scale X X 89 Lower Setpoint Limit X X 90 Upper Setpoint Limit X X 91 Input Filter X X 17 CN8240 amp CN8260 Series Communications amp Options Digital Communications Option Table 1 Continued Number Name Read Write Data Field Value 92 Input Type X X 0 B Thermocouple 1 Thermocouple 2 E Thermocouple 3 J Thermocouple 4 Thermocouple 5 N Thermocouple 6 NNM Thermocouple 7 Thermocouple 8 S Thermocouple 9 T Thermocouple 10 Platinel Il Thermocouple 11 RTD Integer 12 RTD Decimal 13 0 20 mA 14 4 20 mA 15 0 10 mV 16 0 50 mV 17 0 100 mV 18 10 50 mV 19 0 1V 20 0 5V 21 0 10V 22 1 5V 94 Output 1 Type X X 1 Inactive Disabled 2 PID 4 On Off 95 Output 1 Action X X 1 Direct 2 Reverse 18 CN8240 amp CN8260 Series Communications amp Options Digital Communications Option Table 1 Continued Number Name Read Write Data Field Value A2 Output 1 Cycle Time X X A3 Output 1 Low Limit X X A4 Output 1 High Limit X X A5 Output 2 Type X X 1 Inactive Disabled 2 PID 4 On Off A6 Output 2 Action X X 1 Direct 2 Reverse B3 Output 2 Cycle Time
23. ten Lamp 360 W RS 232 Communications A Option C2 RS 232 one to one Communications RCV XMT SIG GND Option Description Provides a one to one connection between the controller and an RS 232 port Computers PLCs or dumb terminals may be used to set and access controller data CN8240 amp CN8260 Series Communications amp Options RS 485 Communications Option C4 RS 485 one to many Communications BO AG SIG GND E 1 Option Description Provides one to many communications Terminate the controller furthest from the computer by either connecting a 120 ohm 1 4 watt resistor between ter minals 23 and 24 or using jumper 1 located on the underside of the communications board as shown above Transducer Power Supply EA Options XP1 XP2 XP3 XP4 Transducer Power Supply 13 14 15 16 17 18 a 2218 M o ma me a l NOTE FOR 2 WIRE RTD JUMPER 18 amp 20 o a SISISISISISISISIE m 0 toi volt out 0 to100 RH 61030 Vdc input Option Description The transducer power supply option provides power to remote transducers The transducer outputs in turn provide a signal to the controller input which can be scaled in the appropriate engineering units Option XP1 15 Vdc Option XP2 12 Vdc Option XP3 10 Vdc Option XP4
24. to write to a read only parameter C Cannot write to a parameter because it s in use CN8240 amp CN8260 Series Communications amp Options Digital Communications Option Examples of valid numeric representations for a 6 character data field Numeric Value ASCII Representation 3 3 0000 000003 003 00 100 100 00 0100 0 000100 3 2 003 20 0003 2 Examples of invalid numeric representations for 6 character data field B represents a blank or a space character Numeric Value Bad ASCII Representation Why 3 BBBBB3 Leading blanks are not allowed 3 0BBBB Trailing blanks are not allowed 3 2 3 20000 is not allowed CHKSUM This is a two character Message Code Numbering System representing the sum of all the ASCII values of all the characters excluding the START CHAR the END CHAR and the CHKSM themselves in the message The sum is computed using the following formula CHKSM SUM AII Message Characters 256 represents the modulus operator END CHAR This is a single character designating the end of the message For all messages the character used is lt CR gt the carriage return CN8240 amp CN8260 Series Communications amp Options Digital Communications Option READ COMMAND TO CONTROLLER Read Command Controller ID Checksum 0101R01B7 lt CR gt Leng of Message Start of Message Parameter Number Zone Number READ RESPONSE FROM CONTROLLER
25. uest character is received that request can be considered lost See Figure 2 below There are three types of Response Messages Read Write and Auxiliary Commands Figure 2 Maximum Time Interval Between Host Request and Slave Controller Response 100 ms max gt Request Message Response Message 13 CN8240 amp CN8260 Series Communications amp Options Digital Communications Option SS SS aei The Read Response The Read Response will be sent in response to a Read Request Some examples Request Message Description 0101R05021 123K8 lt CR gt 0201R101G7 lt CR gt 0101r09021 000N8 lt CR gt LE The value of the Process Variable is 21 123 Degrees C A serial transmission has occurred Framing Error The value of the EEPROM setpoint 1 is 21 Degrees C notice the lowercase r END CHAR CHKSUM DATA STATUS PARAM TYPE ZONE ID START CHAR The Write Response The Write Response will be sent in response to a Write Request Some examples Request Message Description 0101W09311 lt CR gt 0101w100K2 lt CR gt serial transmission error has occurred Parity error Write failed RAM copy of setpoint 1 modified successfully END CHAR CHKSUM STATUS PARAM TYPE ZONE ID START CHAR 14 CN8240 amp CN8260 Series Communications amp Options Digital Communications Option The Auxil
26. um cover age on each product f the unit malfunctions it must be returned to the factory for evaluation OMEGA s Customer Service Department will issue an Authorized Return AR number immediately upon phone or written request Upon examination by OMEGA if the unit is found to be defective it will be repaired or replaced at no charge OMEGA s WARRANTY does not apply to defects resulting from any action of the purchaser including but not limited to mishandling improper interfacing operation outside of design limits improper repair or unauthorized modification This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion or current heat moisture or vibration improper specification misapplica tion misuse or other operating conditions outside of OMEGAS control Components which wear are not warranted including but not limited to contact points fuses and triacs OMEGA is pleased to offer suggestions on the use of its various products However OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA either verbal or written OMEGA warrants only that the parts manufactured by it will be as specified and free of defects OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER EXPRESS OR IMPLIED EXCEPT
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