User`s Manual PLC09 Arbitrator Unit Modbus Interface
Contents
1. The unit checks all messages from a host to see if they are of the all station type If they are a response is not expected If a response is expected a safety timer is invoked to abort a request in case a response is not received The time out value is the time in milliseconds until the first character is received from the PLC after a message is sent The current default time out is 10000 milliseconds 4 21 HOST 1 CHARS O P TO PLC The unit ordinarily sends out characters to the Modicon PLC or Modbus device from a host as soon as received if another host is not active The unit can however be made to wait for a complete message from a host before passing it out the PLC port This will allow characters to be sent out the PLC port without inter character gaps which may be introduced by a host With RTU protocol the newer MODICON PLCs will only tolerate a 3 character inter character time out before invalidating a request If the WHEN ALL RECVD option is selected characters begin to be sent to the PLC only upon expiration of a particular host s inter character time out If the host baud rate is less than that to the PLC the WHEN ALL RECVD must be selected for newer PLCs The current default is 0 AS RECVD Page 15 D filein bcl_temp23651 plc09man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 4 22 HOST 2 CHARS O P TO PLC The unit ordinarily sends out characters to the MODICON PLC or2. 4 14 HOST 2 PROTOCOL RTU 0 ASCII 1 This option is only available if the unit has been configured for RTU protocol section 4 9 If the unit has been configured to communicate with the PLC using RTU protocol itis possible to configure the Host 2 port to communicate with the PLC using ASCII or RTU protocol If ASCII is selected the unit will translate the host s protocol to RTU to the PLC and vice versa If the unit detects a LRC error it will invalidate the computed CRC passed on to the PLC and vice versa Selecting RTU protocol results in the messages from Host 2 being passed on unaltered The current default is 0 RTU protocol Page 13 D filein bcl_temp23651 plc09man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 4 15 HOST 2 RTU FORMAT 8 DATA This option is available only if the unit has been configured for RTU protocol section 4 9 For RTU protocol Host 2 can only communicate to the unit with a format of 1 start 8 data odd even or no parity and 1 or 2 stop bits The current default is 0 1 start 8 data even parity and 1 stop bit 4 16 HOST 2 ASC FORMAT 7 DATA This option is available if the unit has been configured for either RTU or ASCII protocol section 4 9 Host 2 can only communicate to the unit with a format of 1 start 7 data odd or even parity and 1 or 2 stop bits The current default is O 1 start 7 data even parity and 1 stop bit 4 17 HOST 3
3. 2 2 1 HOST 1 CONFIG 9 pin female DB9 connector Pin 2 RX data input Pin3 TX data output Pin 4 DTR output Held high through 3 K res to 5 V Pin5 Ground Pin 7 RTS output 2 2 2 HOST 2 9 pin female DB9 connector Pin2 RX data input Pin 3 TX data output Pin 4 DTR output Held high through 3 K res to 5 V Pin5 Ground 2 2 3 PLC 9 pin male DB9 connector Pin2 RX data input Pin3 TX data output Pin 4 DTR output Held high through 3 K res to 5 V Pin5 Ground Pin 7 RTS output 2 24 HOST 3 6 pin Telco RJ 12 Pin 1 Ground Pin 2 DTR output Pin 3 RX data input Pin4 TX data output 2 25 DC POWER female DC power jack 2 5mm Tip 9to 15 VDC 24 VDC optional Ring Ground Page 7 D filein bcl_temp23651 plc09man with connection doc PLCOO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 3 0 Mode of Operation The MODBUS Interface Unit utilises time outs to determine the end of request and response messages It assumes the start of a message as soon as the first character is received from a host and calls the message complete whenever the inter character time exceeds a configurable value or a response is received from the Modicon PLC or Modbus device The unit uses an internal 1 millisecond clock to resolve time outs There are separate time outs that can be altered for each port The message from a host to the PLC is checked to determine if it is a broadcast type all station If it is a b
4. Page 4 Upon power up the unit checks EPROM and RAM memory for validity If a fault occurs the LED on the front of the unit will blink once every 1 5 seconds for an EPROM problem twice every 2 0 seconds for a RAM problem and three times every 2 5 seconds if the default configuration has been restored If there are no errors the LED is on steady if characters are not being output to a PLC or as configured If the LED is out and the unit is not in configuration mode the unit is faulty The unit uses time outs to determine the end of messages Messages are checked for all station requests that don t invoke a response from the controller The unit can be configured to communicate with all hosts in ASCII protocol RTU protocol or to one host in RTU protocol and the other two hosts in ASCII protocol In the latter case the unit converts the ASCII to RTU protocol If the power up checks indicate that RAM and EPROM are fine the LED on the front panel goes on steady However the front LED can be configured to indicate output is currently in progress via one of the ports A parameter is available to select which port output to monitor using the LED A configurable option allows host ports to be locked out if another host port is issuing programming commands to the PLC Note Some Modicon PLC internal status commands are considered programming commands so this feature D filein bcl_temp23651 plcO9man with connection doc PLCO9
5. This parameter is the inter character time out for messages from Host 3 to the PLC The minimum value should be at least 3 times the time to receive a single character from the host For instance if the baud rate is 9600 and the host can send characters continuously a value of 3 should be sufficient If the host does not send characters at this rate the time out s value should be increased accordingly This value should be made larger than required as it is mainly to start the response safety timer if the HOST 3 CHARS O P TO PLC option is not selected If the complete message is passed to the PLC and the timer is still active and the PLC responds the unit will automatically assume the message was complete anyway However if the HOST 3 CHARS O P TO PLC option is selected section 4 23 this time out determines when to begin sending the buffered message to the PLC and in this case should not be made larger than required Values from 1 to 9999 milliseconds are allowed The current default time out is 100 milliseconds 4 4 PLC INTER CHAR AND MSG COMPL T O This parameter is the message complete time out from the PLC to a host It s value should be the larger of the inter character time outs from the PLC to the unit or from the unit to either host The time out will be aborted if the host currently receiving a message from the PLC sends another message immediately However if this is the case and another host has a pending message it w
6. 1 RTS CONTROL OFF 0 ON 1 RTS TO HOST 1 TX DELAY T O RTS TO HOST 1 OFF DELAY T O HIGHEST VALID PLC NO LOWEST VALID PLC NO PLC RTS CONTROL OFF 0 ON 1 RTS TO PLC TX DELAY T O RTS TO PLC OFF DELAY T O UNSOLICITED HOST IGNORE HOST 1 COMMAND MSG IGNORE HOST 2 COMMAND MSG IGNORE HOST 3 COMMAND MSG PRIORITY HOST PRIORITY HOST T O 157 RX CHAR MATCH 1 TX CHAR OFF 0 ON 1 157 RX CHAR MATCH DESIG CHAR OFF 0 ON 1 157 RX CHAR DESIGNATED CHAR 5 0 Hardware 6 0 Radio Frequency Information 7 0 Contact Information 8 0 Cable Interconnect Page 3 D filein bcl_temp23651 plc09man with connection doc Rev 1 83 2003 July 28 23 24 25 PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 1 0 Introduction The MODBUS Interface Unit is equipped with four serial asynchronous ports It is designed to connect between the serial ports of three host computers and a MODICON PLC or Modbus device The Interface unit s software allows access to the controller on around robin basis If one host is currently accessing the controller and a request is received from another other host its request is queued until the initial host s interrogation and subsequent PLC response is complete The unit is equipped with battery backed up RAM which holds the configurable parameters 1 1 Features Power Up Check Message Detection Protocols Output Indication Programming Lock
7. Canputer Systens Lin ited 09 ARB ITRATOR D filein bcl_temp23651 plcO9man with connection doc
8. Modbus device from a host as soon as received if the other host is not active The unit can however be made to wait for a complete message from a host before passing it out the PLC port This will allow characters to be sent out the PLC port without inter character gaps which may be introduced by a host With RTU protocol the newer MODICON PLOs will only tolerate a 3 character inter character time out before invalidating a request If the WHEN ALL RECVD option is selected characters begin to be sent to the PLC only upon expiration of a particular host s inter character time out If the host baud rate is less than that to the PLC the WHEN ALL RECVD must be selected for newer PLCs The current default is 0 AS RECVD 4 23 HOST 3 CHARS O P TO PLC The unit ordinarily sends out characters to the MODICON PLC or Modbus device from a host as soon as received if the other host is not active The unit can however be made to wait for a complete message from a host before passing it out the PLC port This will allow characters to be sent out the PLC port without inter character gaps which may be introduced by a host With RTU protocol the newer MODICON PLCs will only tolerate a 3 character inter character time out before invalidating a request If the WHEN ALL RECVD option is selected characters begin to be sent to the PLC only upon expiration of a particular host s inter character time out If the host baud rate is less than that to the PLC th
9. input After configuration is complete or to abort the dialog at any time the ESCAPE key should be pressed The message RETURNING TO NORMAL OPERATION will be output and the unit will begin operation with the new parameters If CONTROL R rather than ENTER is pressed the message RESTORE DEFAULT CONFIGURATION Y N is asked If Y followed by ENTER is entered the unit will reset all its parameters to the default values Page 9 D filein bcl_temp23651 plcO9man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 4 1 HOST 1 INTER CHAR AND MSG COMPL T O This parameter is the inter character time out for messages from Host 1 to the PLC The minimum value should be at least 3 times the time to receive a single character from the host For instance if the baud rate is 9600 and the host can send characters continuously a value of 3 should be sufficient If the host does not send characters at this rate the time out s value should be increased accordingly This value should be made larger than required as it is mainly to start the response safety timer if the HOST 1 CHARS O P TO PLC option is not selected If the complete message is passed to the PLC and the timer is still active and the PLC responds the unit will automatically assume the message was complete anyway However if the HOST 1 CHARS O P TO PLC option is selected section 4 21 this time out determines when to begin
10. is required when enabling this feature as some Modicon PLC internal status requests are interpreted as programming commands The default condition is 0 OFF which means the unit will not detect programming messages in order to lockout a Host 4 27 HOST 1 RTS CONTROL OFF 0 ON 1 This option allows RTS to be set high modem carrier on during output from the Arbitrator to Host 1 Option 4 28 sets the time from RTS going high until the first character of a PLC response is sent out the Host 1 port This time can be used for 202 modem carrier stabilisation before transmission occurs Option 4 29 sets the time from the last bit transmitted until RTS is turned off If control is OFF RTS is always asserted The default option is 0 OFF Page 17 D filein bcl_temp23651 plc09man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 4 28 RTS TO HOST 1 TX DELAY T O This option is only available if option 4 27 is selected ON This timeout specifies the time to begin sending characters to Host 1 after RTS is set high RTS is set high when the first character of a response from the PLC is received and is not set low modem carrier off until all characters are sent out plus an additional time specified in option 4 29 Timeout values from 1 to 2000 milliseconds may be specified The default timeout is 1 millisecond 4 29 RTS TO HOST 1 OFF DELAY T O This option is only available if option 4 27 is
11. of the device detecting interference Relocate the device away from the PLCO9 ARBITRATOR Use different branch outlets to power the device The booklet HOW TO IDENTIFY AND RESOLVE RADIO TV INTERFERENCE PROBLEMS prepared by the FCC may also be helpful Page 23 D filein bcl_temp23651 plc09man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 7 0 Contact Information For any further assistance and suggestions for future enhancements concerning the PLCO9 ARBITRATOR MODBUS INTERFACE please contact Calta Computer Systems Limited Suite 202 7003 5 Street S E Calgary Alberta Canada T2H 2G2 Phone 403 252 5094 Fax 403 252 5102 E Mail ccompute calta com Web Site http www calta com Page 24 D filein bcl_temp23651 plc09man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual 8 0 Cable Interconnect DB 9S H 5 BRD 5 9 LED lt TO TR o 3 Xx P 7 TS 7 2 X p o 1 DB 9S H 5 BRD 5 79 T 4 TR 5 0 2 x s 7 0 2 RX o 1 P Ps L DB M 0 n i PRD 9 9 9 A L 4 0 TR R B 0 3 X I Pp n 7 RTS R R 2 X A T c T 1 ou R S RJ128 1 o s l 1 T i 3 1 P I o R T I l CONF GURAT DN P 9 15 we 5 POR UDIN Page 25 Rev 1 83 2003 July 28 B Calta
12. selected ON This timeout specifies the time to drop RTS after the last bit is transmitted Timeout values from 2 to 255 milliseconds may be specified The default timeout is 2 milliseconds 4 30 HIGHEST VALID PLC NO The unit can be configured to wait for replies only from a selected range of PLC addresses This option specifies the largest PLC address for which the Arbitrator can expect a response The message is sent out the PLC port but the unit does not wait for a reply This option is important when a Host port is on a multidrop communications link The highest valid PLC address is 255 The default range of PLC addresses is from 0 see section 4 31 to 255 4 31 LOWEST VALID PLC NO The unit can be configured to wait for replies only from a selected range of PLC addresses This option specifies the lowest PLC address for which the Arbitrator can expect a response This option is important when a Host port is on a multidrop communications link The default lowest valid PLC address is 0 The default range of PLC addresses is from 0 to 255 see section 4 30 Page 18 D filein bcl_temp23651 plc09man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 4 32 PLC RTS CONTROL OFF 0 ON 1 This option allows RTS to be set high modem carrier on during output from the Arbitrator to the PLC Option 4 33 sets the time from RTS going high until the first character of a PLC response is sent out
13. sending the buffered message to the PLC and in this case should not be made larger than required Values from 1 to 9999 milliseconds are allowed The current default time out is 100 milliseconds 4 2 HOST 2 INTER CHAR AND MSG COMPL T O This parameter is the inter character time out for messages from Host 2 to the PLC The minimum value should be at least 3 times the time to receive a single character from the host For instance if the baud rate is 9600 and the host can send characters continuously a value of 3 should be sufficient If the host does not send characters at this rate the time out s value should be increased accordingly This value should be made larger than required as it is mainly to start the response safety timer if the HOST 2 CHARS O P TO option is not selected If the complete message is passed to the PLC and the timer is still active and the PLC responds the unit will automatically assume the message was complete anyway However if the HOST 2 CHARS O P TO PLC option is selected section 4 22 this time out determines when to begin sending the buffered message to the PLC and in this case should not be made larger than required Values from 1 to 9999 milliseconds are allowed The current default time out is 100 milliseconds Page 10 D filein bcl_temp23651 plc09man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 4 3 HOST 3 INTER CHAR AND MSG COMPL T O
14. AT 8 DATA This option is available only if the unit has been configured for RTU protocol section 4 9 For RTU protocol the unit can only communicate to the PLC with a format of 1 start 8 data odd even or no parity and 1 or 2 stop bits The current default is O 1 start 8 data even parity and 1 stop bit Page 12 D filein bcl_temp23651 plc09man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 4 11 PLC ASC FORMAT 7 DATA This option is available only if the unit has been configured for ASCII protocol section 4 9 For ASCII protocol the unit can only communicate to the PLC with a format of 1 start 7 data odd or even parity and 1 or 2 stop bits The current default is O 1 start 7 data even parity and 1 stop bit 4 12 HOST 1 RTU FORMAT 8 DATA This option is available only if the unit has been configured for RTU protocol section 4 9 For RTU protocol Host 1 can only communicate to the unit with a format of 1 start 8 data odd even or no parity and 1 or 2 stop bits The current default is O 1 start 8 data even parity and 1 stop bit 4 13 HOST 1 ASC FORMAT 7 DATA This option is available only if the unit has been configured for ASCII protocol section 4 9 For ASCII protocol Host 1 can only communicate to the unit with a format of 1 start 7 data odd or even parity and 1 or 2 stop bits The current default is O 1 start 7 data even parity and 1 stop bit
15. Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 should be used with caution RTS Control Host port 1 can control RTS for a 202 type modem or Radio in order to turn carrier on off Page 5 D filein bcl_temp23651 plcO9man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 2 0 Installation 2 1 General The rear of the MODBUS Interface Unit contains four female connectors a male connector and a pushbutton switch The first connector a dc power jack on the left is for power 9 to 15 volts D C Next is the pushbutton used for initiating the configuration mode This is followed by a telco RJ12 connector for Host 3 The third connector male 9 pin is for connection to the Modicon PLC or Modbus device The remaining two female 9 pin connectors are for Hosts 2 and 1 respectively The Host 1 connection is also used for configuration For MODBUS ASCII protocol all ports can be configured for 1 start bit 7 data bits even or odd parity and 1 or 2 stop bits For MODBUS RTU protocol all ports can be configured for 1 start 8 data even odd or no parity and 1 or 2 stop bits The current default rate for all four ports is 9600 baud Each port baud rate can be configured for 110 300 1200 2400 4800 9600 and 19200 baud Page 6 D filein bcl_temp23651 plcO9man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 2 2 Port Connector Pin Assignment
16. PROTOCOL RTU 0 ASCII 1 This option is only available if the unit has been configured for RTU protocol section 4 9 If the unit has been configured to communicate with the PLC using RTU protocol itis possible to configure the Host 3 port to communicate with the PLC using ASCII or RTU protocol If ASCII is selected the unit will translate the host s protocol to RTU to the PLC and vice versa If the unit detects a LRC error it will invalidate the computed CRC passed on to the PLC and vice versa Selecting RTU protocol results in the messages from Host 3 being passed on unaltered The current default is 0 RTU protocol 4 18 HOST 3 RTU FORMAT 8 DATA This option is available only if the unit has been configured for RTU protocol section 4 9 For RTU protocol Host 3 can only communicate to the unit with a format of 1 start 8 data odd even or no parity and 1 or 2 stop bits The current default is O 1 start 8 data even parity and 1 stop bit Page 14 D filein bcl_temp23651 plc09man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 4 19 HOST 3 ASC FORMAT 7 DATA This option is available if the unit has been configured for either RTU or ASCII protocol section 4 9 Host 3 can only communicate to the unit with a format of 1 start 7 data odd or even parity and 1 or 2 stop bits The current default is O 1 start 7 data even parity and 1 stop bit 4 20 PLC RESPONSE SAFETY T O
17. User s Manual PLCOO9 Arbitrator Unit Modbus Interface Calta Computer Systems Limited Firmware Revision 1 83 July 28 2003 registered Trade Mark of Modicon an AEG Company 9 Arbitrator Modbus Interface Unit Manual INDEX 1 0 Introduction 1 1 Features 2 0 Installation 2 1 General 2 2 Port Connector Pin Assignment 2 2 1 HOST 1 CONFIG 2 2 2 HOST 2 2 2 3 PLC 2 2 4 HOST 3 2 2 5 DC POWER 3 0 Mode of Operation 4 0 Configuration Dialog HOST 1 INTER CHAR AND MSG COMPL T O HOST 2 INTER CHAR AND MSG COMPL T O HOST 3 INTER CHAR AND MSG COMPL T O PLC INTER CHAR AND MSG COMPL T O HOST 1 RATE HOST 2 RATE HOST 3 RATE PLC RATE PLC PROTOCOL RTU 0 ASCII 1 PLC RTU FORMAT 8 DATA PLC ASC FORMAT 7 DATA HOST 1 RTU FORMAT 8 DATA HOST 1 ASC FORMAT 7 DATA HOST 2 PROTOCOL RTU 0 ASCII 1 HOST 2 RTU FORMAT 8 DATA HOST 2 ASC FORMAT 8 DATA HOST 3 PROTOCOL RTU 0 ASCII 1 HOST 3 RTU FORMAT 8 DATA HOST 3 ASC FORMAT 8 DATA PLC RESPONSE SAFETY T O HOST 1 CHARS O P TO PLC HOST 2 CHARS O P TO PLC D filein bcl_temp23651 plc09man with connection doc Rev 1 83 2003 July 28 NN N N O O 9 Arbitrator Modbus Interface Unit Manual 4 23 4 24 4 25 4 26 4 27 4 28 4 29 4 30 4 31 4 32 4 33 4 34 4 35 4 36 4 37 4 38 4 39 4 40 4 41 4 42 4 43 HOST 3 CHARS O P TO PLC HOST 1 CONFIGURATION RATE LED O P PROGRAMMING PLC LOCKOUT HOST
18. ardware The MODBUS Interface Unit contains a HC68B09 Hitachi microprocessor 8192 bytes of battery backed up RAM 65536 bytes of EPROM Erasable programmable read only memory a status LED and two 88C681 DUART Dual universal asynchronous receiver transmitter used to communicate with the Hosts and PLC Internal TTL to RS232C signal conditioning is provided by RS232 and RS237 interface ICs Any D C voltage from 9 to 15 volts can power the standard unit A calculator power supply rated at 9 volts D C and 500 milliamps is supplied As an option units can be supplied with 24 volt D C capability and a power cable is substituted for the calculator power supply All ICs are CMOS type allowing the unit to operate in a wide variance of operating conditions The unit s current drain is 70 milliamps Page 22 D filein bcl_temp23651 plc09man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 6 0 Radio Frequency Information PLCO9 ARBITRATOR has been tested and found to comply with the limits of a Class computing device in accordance with the specifications in part 15 of the FCC rules which are designed to provide reasonable protection against RF interference ina commercial installation However there is no guarantee that interference will not occur in a particular installation If this equipment does cause interference to radio or TV reception the following measures may be attempted Reorient the antenna
19. e WHEN ALL RECVD must be selected for newer PLCs The current default is 0 AS RECVD 4 24 HOST 1 CONFIGURATION RATE This parameter is used to set the default baud rate from Host 1 to a terminal or PC for configuring the unit This is a completely separate parameter from the HOST 1 RATE in section 4 5 When the configuration pushbutton is pressed this parameter selects the baud rate at which the unit will communicate Values allowed are 110 300 600 1200 2400 4800 9600 and 19200 baud The current default rate is 9600 baud Page 16 D filein bcl_temp23651 plc09man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 4 25 LED O P As a diagnostic aid the front panel LED can be used for indicating when characters are being sent out one of the four ports If characters are being sent the LED will blink 10 times a second It will continue to blink up to 1 second after a character is sent Specifying can disable this feature The default condition is 0 PLC port output monitoring 4 26 PROGRAMMING PLC LOCKOUT This option allows the unit to detect a programming message with a function code of 9 13 18 or 126 on a host port if selected ON When a programming message is detected messages from another Host port will be ignored for ten 10 seconds to allow for uninterrupted multiple programming messages Each subsequent programming message will extend the lock out Caution
20. he Arbitrator still sends the message out the PLC port but invalidates the CRC code This feature can be turned ON 1 or OFF 0 The default option is 0 OFF 4 37 IGNORE HOST 2 COMMAND MSG This option allows all command messages function codes 5 6 15 and 16 to be invalidated from Host 2 The Arbitrator still sends the message out the PLC port but invalidates the CRC code This feature can be turned ON 1 or OFF 0 The default option is 0 OFF 4 38 IGNORE HOST 3 COMMAND MSG This option allows all command messages function codes 5 6 15 and 16 to be invalidated from Host 3 The Arbitrator still sends the message out the PLC port but invalidates the CRC code This feature can be turned ON 1 or OFF 0 The default option is 0 OFF 4 39 PRIORITY HOST This option allows a Host to be designated as a priority Host This means as long as the priority Host is active it is allowed exclusive use of the PLC port Once the priority Host port is idle for the timeout specified by item 4 40 other Hosts can access the PLC port Host ports 1 2 or 3 can be selected as priority The default option is 0 and therefore no Host is selected as the priority one Page 20 D filein bcl_temp23651 plc09man with connection doc PLCOO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 4 40 PRIORITY HOST T O This option sets the time out for a priority Host port This option is only available if option 4 39 has a priorit
21. ill gain access to the PLC Values from 1 to 9999 milliseconds are allowed The current default time out is 100 milliseconds 4 5 HOST 1 RATE This parameter is used to set the baud rate from Host 1 to the unit Values allowed are 110 300 600 1200 2400 4800 9600 and 19200 baud The current default rate is 9600 baud Page 11 D filein bcl_temp23651 plc09man with connection doc PLCOO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 4 6 HOST 2 RATE This parameter is used to set the baud rate from Host 2 to the unit Values allowed are 110 300 600 1200 2400 4800 9600 and 19200 baud The current default rate is 9600 baud 4 7 HOST 3 RATE This parameter is used to set the baud rate from Host 2 to the unit Values allowed are 110 300 600 1200 2400 4800 9600 and 19200 baud The current default rate is 9600 baud 4 8 PLC RATE This parameter is used to set the baud rate from the PLC to the unit Values allowed are 110 300 600 1200 2400 4800 9600 and 19200 baud The current default rate is 9600 baud 4 9 PLC PROTOCOL RTU 0 ASCII 1 This parameter specifies the protocol from the unit to the PLC If ASCII protocol is selected all three hosts must also communicate in Ascii protocol If RTU protocol is selected Host 1 must communicate in RTU protocol and Hosts 2 and 3 can communicate in either RTU or ASCII protocol The current default type is 0 RTU protocol 4 10 PLC RTU FORM
22. prompt under Windows 3 1 95 and 98 It will not work under NT or 2000 For NT and 2000 the file PLCO9 HT is supplied for use in configuring HyperTerminal which replaces TERM EXE HyperTerminal is included without charge with Windows 95 98 NT 2000 See TERM TXT and 9 on the supplied Terminal Emulator floppy disk for operating instructions with TERM EXE and HyperTerminal respectively Pressing the pushbutton for approximately 1 second on the back of the unit until the Front Panel Led is extinguished will put the unit into configuration mode At this time the message PLCO9 MODBUS ARBITRATOR 2000 DEC 20 REV 1 8 CONFIGURATION MODE PRESS ENTER OR CR TO PROCEED CONTROL R TO RESET TO UNIT DEFAULT PARAMETERS OR ESCAPE TO RETURN TO NORMAL OPERATION is repeatedly sent out the Host 1 port If the message is sent out ten times without a response the unit will return to Normal Operation automatically Once ENTER is input the configuration dialog begins The configuration method is of the question and answer type The description of the configurable parameter and it s current value followed by a is output If the value is only to be viewed pressing carriage return or ENTER will leave the value unaltered and display the next parameter or pressing CONTROL B will display the previous parameter If the value is to be altered the new value is typed followed by ENTER Typing the BACKSPACE or DELETE keys can erase erroneous
23. roadcast type no response is expected If it is not a safety timer is invoked to abort the request in case the PLC does not respond This default time out value is set to 10 seconds 10000 milliseconds and can be altered The unit does not expect a response from the PLC for messages of less than three characters from a host There is a configurable option to detect a programming message with a function code of 9 13 18 or 126 on a host port If this option is selected ON messages from other host ports will be ignored for ten 10 seconds to allow for uninterrupted multiple programming messages Each subsequent programming message will extend the lock out Page 8 D filein bcl_temp23651 plcO9man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 4 0 Configuration Parameters such as time outs protocol type and baud rates may be altered in the unit via the Host 1 port and saved in battery backed up Random Access Memory RAM Any terminal or PC equipped with a terminal emulator package may be used to respond to the configuration dialog The default configuration baud rate is 9600 and an asynchronous format of 1 start 8 data and 1 stop bit The configuration software handles X ON X OFF flow control A stand alone DOS software program TERM EXE supplied with the unit on 3 12 inch floppy disk will allow configuration from a PC with a serial communication port TERM EXE will work under DOS and the DOS
24. the PLC port This time can be used for 202 modem carrier stabilisation before transmission occurs If control is OFF RTS is always asserted The default option is 0 OFF 4 33 RTS TO PLC TX DELAY T O This option is only available if option 4 32 is selected ON This timeout specifies the time to begin sending characters to the PLC after RTS is set high RTS is set high when the first character of a message for the PLC is received and is not set low modem carrier off until all characters are sent out plus an additional time specified by option 4 34 has elapsed Timeout values from 1 to 2000 milliseconds may be specified The default timeout is 1 millisecond 4 34 RTS TO PLC OFF DELAY T O This option is only available if option 4 32 is selected ON This timeout specifies the time to drop RTS after the last bit is transmitted Timeout values from 2 to 255 milliseconds may be specified The default timeout is 2 milliseconds 4 35 UNSOLICITED HOST This option allows unsolicited characters received on the PLC port to be sent to a designated Host Host ports 1 2 or 3 can be selected The default option is 0 no Hosts selected and unsolicited characters are ignored Page 19 D filein bcl_temp23651 plc09man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 4 36 IGNORE HOST 1 COMMAND MSG This option allows all command messages function codes 5 6 15 and 16 to be invalidated from Host 1 T
25. y Host 1 2 or 3 For example if Host 1 is selected as the priority one messages from Hosts 2 and 3 will be ignored once Host 1 sends a message If Host 1 ceases to send messages for the duration of this timeout the lock out will be disabled until Host 1 begins sending messages again The default timeout is 15000 milliseconds 4 41 157 RX CHAR MATCH 15 TX CHAR OFF 0 ON 1 This option when selected ON allows the PLCO9 to begin passing PLC receive characters to a Host when the first transmitted character matches a receive character This option is only available if option 4 42 is not selected ON The default value for this option is 0 OFF no match required 4 42 157 RX CHAR MATCH DESIG CHAR OFF 0 ON 1 This option when selected ON allows the PLCO9 to begin passing PLC receive characters to a Host when a received character matches the entered designated receive character in option 4 43 This option is only available if option 4 41 is not selected ON The default value for this option is 0 OFF no match required 4 43 1 RX CHAR DESIGNATED CHAR This option is only available if option 4 42 is selected ON It allows a designated match character to be specified The character value is entered in decimal and is a number from 0 to 255 The default designated character is O Page 21 D filein bcl_temp23651 plc09man with connection doc PLCO9 Arbitrator Modbus Interface Unit Manual Rev 1 83 2003 July 28 5 0 H
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