2755-2.55, Interfacing DS/DD Bare Code Decoder to PLC
Contents
1. ordan e Korea e Kuwait e Lebanon e Malaysia Mexico e Netherlands e New Zealand e Norway e Pakistan e Peru e Philippines e Poland e Portugal e Puerto Rico e Qatar e Romania Russia CIS e Saudi Arabia e Singapore e Slovakia e Slovenia e South Africa Republic e Spain e Sweden e Switzerland e Taiwan e Thailand e Turkey e United Arab Emirates e United Kingdom e United States e Uruguay e Venezuela e Yugoslavia Allen Bradley Headquarters 1201 South Second Street Milwaukee WI 53204 USA Tel 1 414 382 2000 Fax 1 414 382 4444 Publication 2755 2 55 September 1995 40062 320 01 A Copyright 1995 Allen Bradley Company Inc Printed in USA2. Overview Hardware Requirements software Requirements Application Note Interfacing a 2755 DS DD Bar Code Decoder to PLC 5 using DH485 Protocol with the 2 60 RB Module and the 2760 SFC2 Protocol Cartridge The purpose of this application note 15 to explain how to interface the 2755 DS DD Bar Code Decoder to the 2760 RB Network Interface Module via Allen Bradley s proprietary DH485 communications protocol using the 2760 SFC2 protocol cartridge Up to thirty one decoders can be interfaced to each of the three network interface ports for a total of up to ninety three decoders per 2760 RB module This document includes cable diagrams and configuration information for the 2760 RB and the 2755 DS DD decoder Also included is an introductory PLC program necessary to establish communication from the PLC to the 2760 RB interface module Implementation of the procedure described in this application note requires the following Allen Bradley hardware e Allen Bradley 2755 family of unattended bar code decoders e Bulletin 2760 RB in a Bulletin 1771 rack with a PLC 5 processor 2760 SFC2 protocol cartridge e Personal computer PC with terminal emulator software or 100 type terminal to configure the 2755 DS DD bar code decoder and the 2760 RB network interface module e Appropriate cables to program the PLC 5 and configure the Bulletin 2755 bar code decoder Refer to hardware manuals for cable requirements e Catalog Number 1784 K
3. configure screens 3 21 and 11 in that order exactly as shown below 2755 2 55 September 1995 Figure 3a 2760 RB Module Configuration Screens 2760 RB SERIES A REVISION COPYRIGHT 1989 ALLEN BRADLEY COMPANY INC 1X CONFIGURATION PARAMETERS 2X IDENTIFICATION NUMBERS 3 DEVICE PORT PROTOCOLNAMES 4DM MATCH CODE ENTRIES 5 DISCRETE BYTE INPUT ENTRIES 6 THE DATA MATRIX ENTRIES THE PASS THROUGH ENTRIES 8 NON VOLATILE SCRATCH PAD AREA 9XF RB MODULE FUNCTIONS AX HARDWARE DIAGNOSTICS BX SOFTWARE DIAGNOSTICS C EXIT CONFIGURATION MODE WHERE X 0 TO 7 AND D 1 TO 3 ARE PORT NUMBERS WHICH ARE DEFINED BELOW 0 RBCMMNDPRCSS 2 SERIALPORT2 4 CONFIG PORT 6 1 0 RACK SLT 1 I RESERVED WHERE F ARE FUNCTIONS THAT RB CAN PERFORM WHICH ARE DEFINED BELOW A RESET B SET DEFAULTS C FLUSH D INITIALIZE E CLEAR DIAGS WHERE M A TO T AND I A TO H ARE ENTRY NUMBERS FOR THE SELECTION MADE ABOVE ENTER A MAIN MENU SELECTION ENTER A MAIN MENU SELECTION 3 PORT 1 COPYRIGHT 1989 ALLEN BRADLEY COMPANY INC 2760 SFC2 LAN SERIES A REVISIONA YES NO z YES PORT 2 COPYRIGHT 1989 ALLEN BRADLEY COMPANY INC 2760 SFC2 DT SERIES A REVISIONA YES NO YES PORT COPYRIGHT 1989 ALLEN BRADLEY COMPANY INC 2760 SFC2 LAN SERIES A REVISIONA YES NO zYES EDIT THIS SELECTION YES NO 2755 2 55 September 1995 Figure 3b 2760 RB Module Configuration Sc
4. 42 Cable d or Equivalant 2755 DD DS DM6 9 Table A Example PLC 5 Processor Dip Switch Settings Switch No 1 2 3 4 5 6 7 8 ff SWI 1 on on on on on on on 0 SWI 2 off on on off a fo fo fo Table B Example I O Chassis Backplane Dip Switch Settings 1 2 3 4 5 6 T 8 of of of epum of of Table C Example 2760 RB Module Dip Switch Settings Switch No SWI 1 off ff ff SWI 2 of off of of of of off of of of 0 pepepepe opo m of of om off 2755 2 55 September 1995 Running the Application 2755 2 55 September 1995 The configuration screens for the 2760 RB and the 2755 DS DD decoder should be entered exactly as shown in the following pages Save them and then restart the decoder Connect a network cable from the host port of the 2755 DD DS decoder to port 1 of the 2760 RB See Figure 6 for cable construction information When the 2755 DS DD is in the network mode RS485 ASCII Mode 1 or RS485 ASCH Mode 2 it will be waiting for a poll from the 2760 RB module If the 2760 RB is not configured to poll a node that is physically installed on the network the decoder will refuse to read any bar codes When the decoder has valid bar code data or a no read message it will transmit the data to the 2760 RB on receipt of a poll You can recognize Normal operation by green LED s on the 2760 RB module e The Active Faul
5. 760 822 Pages 4 11 and 5 5 for further RS 485 wiring details especially if using the node connectors provided with the 2760 SFC2 Protocol Cartridges 2755 2 55 September 1995 Notes 11 2755 2 55 September 1995 SLC 5 03 SLC 5 04 DH and INTERCHANGE are trademarks of Allen Bradley Company Inc OS 2 is a registered trademark of International Business Machines Incorporated Gateway 2000 and COLORBOOK are trademarks of Gateway 2000 Inc Microsoft and MS are registered trademarks and Windows is a trademark of Microsoft Corp VERSA is a trademark of Nippon Electric Information Systems Inc 0 Rockwell Automation Allen Bradley a Rockwell Automation Business has been helping its customers improve productivity and quality for more than 90 years We design manufacture and support a broad Allen Bradley range of automation products worldwide They include logic processors power and motion control devices operator interfaces sensors and a variety of software Rockwell is one of the worlds leading technology companies Worldwide representation Argentina e Australia e Austria e Bahrain e Belgium e Brazil e Bulgaria e Canada Chile e China PRC e Colombia e Costa Rica e Croatia e Cyprus e Czech Republic e Denmark e Ecuador e Egypt e El Salvador e Finland e France e Germany e Greece e Guatemala e Honduras e Hong Kong Hungary Iceland e India e Indonesia e Ireland e Israel e Italy eJ amaica
6. T or equivalent card installed in your personal computer to enable you to program the PLC 5 e DH485 network cables Implementation of the procedure described in this application note requires the following Allen Bradley software e Bulletin 6200 development software for the PLC 5 e Terminal Emulation Package such as Procomm or Windows Terminal if a personal computer is used to configure the 2755 DS DD 2155 2 55 September 1995 Related Publications This document refers to the following publications which should be available for reference while working through this application note Publication Number Title 1785 XXX User Manual for your PLC 5 6200 XXX Programming Manual for your PLC 5 755 833 Bulletin 2755 DS DD Enhanced Decoder User Manual 2760 ND001 Bulletin 2760 Flexible Interface Module User Manual 755 82 Bulletin 2760 RS485 LAN Master Slave Protocol Cartridge User Manual Configuration Mount the Catalog Number 2760 RB interface module in Slot 0 of the 1771 chassis next to the PLC The Bulletin 2755 DS DD bar code decoder communicates through Port 1 of the 2760 RB module A Catalog Number 1771 ASB interface module can also be used to communicate with the 2760 RB module over the chassis backplane via Remote I O The 2760 RB configuration example in this document includes configuration screens and DIP switch settings necessary to establish communications with the 2755 DS DD decoder via DH485 The 2760 RB and
7. addressed to the BRR bit in another rung just before the Block Transfer Read BTR rung This ensures that the BRR bit is seen by the NP 5 processor See Figure 5 below Figure 5 Sample PLC Program 2760 RB Revision H or J to PLC 5 20 30 40 50 Note BTR must come before BTW 7 200 0 0 N 1 0 0 7 25 N7 400 0 0 2755 2 55 September 1995 10 Figure 6 Cable diagrams 2760 RB Module 1784 T45 Configuration P ort to Terminal Mode 25 pin D Male 25 pin D Female TX 2 3 RX RX 3 2 IX 4 5 jumper 6 20 2760 RB Module Dumb Terminal or 9 pin Configuration P ort to VT 100 PC Com Port 25 pin D Male 25 pin D Female TX 2 3 RX 2 RX RX 3 2 IX 3 IX GND 7 7 GND 5 GND 4 6 jumper 7 6 jumper 2755 DSIA Dumb Terminal or 9 pin Auxiliary P ort to VT 100 PC Com Port 25 pin D Male 25 pin D Female RX 2 2 IX 3 IX TX 3 3 RX 2 RX GND 7 7 GND 5 GND 4 6 jumper 7 8 jumper 2755 051 2760 Host P ort Port 1 25 pin D male to 25 pin D male RS 485 14 14 RS 485 RS 485 13 15 RS 485 Jumper 12 Cable Shield 1 Com 7 7 GND Note Use Beldon 9842 Cable or Equivalant Note Refer to Publication 2
8. er Read 0 15 Rack 0 Group 1 Module 0 Control Block 7 100 Length 0 Continuous N 11 LAXE S N7 5 Block Transfer Write 15 Rack 0l Group 1 0 Module 0 Control Block 7 5 Data File 7 200 Length 0 Continuous N SS SS SS Refer to your PLC 5 Instruction Reference Manual for detailed information on using the PLC 5 programming software BRR BT7 5 BT7 25 001 E a IIN BTR BRR BT7 5 BT7 25 ques pee 17 127 Rack EN EN Group Module Control Block File Length Continuous 4 Write BTW Data 7 5 7 25 4 17 17 Rack EN EN Group Module Control Block Data File Length Continuous 4 Using the 2760 RB Revision or Above with the New Generation PLC5 When the 2760 RB Revision H or above is used with the New Generation PLCS processors in a local rack there is a possibility that the PLC will not see the BRR bit from the 2760 RB For the PLCS to see the BTR bit an odd number of image scans must occur To ensure that the BTR instruction sees the BRR bit bit 13 you must place an Immediate Input Instruction
9. reens ENTER A MAIN MENU SELECTION 21 RS485 LAN 2755 DM6 ASCII MODE 3 Oh YES NO YES EDIT THIS SELECTION YES NO ENTER A MAIN MENU SELECTION 11 SLOT TIME NO CHARS DEC 0 255 7 INTER CHAR TIME NO CHARS DEC 0 255 7 IDLE TIME NO CHARS DEC 0 255 3 RETRIES DEC 0 255 3 19200 BITS PER SECOND YES NO YES BCD NODE NUMBERS ENABLE DISABLE ENABLE BYTE SWAPPING ENABLE DISABLE ENABLE RECEIVE MATRIXING ENABLE DISABLE DISABLE MATRIX ADDRESS HEX 0 0 RE ESTABLISH FREQUENCY DEC 0 255 25 POLL FREQUENCY DESTINATION O HEX 0 POLL FREQUENCY DESTINATION 1 HEX 0 POLL FREQUENCY DESTINATION 2 HEX 0 POLL FREQUENCY DESTINATION 3 HEX 0 POLL FREQUENCY DESTINATION 4 HEX 0 POLL FREQUENCY DESTINATION 5 HEX 0 POLL FREQUENCY DESTINATION 6 HEX 0 POLL FREQUENCY DESTINATION 7 HEX 0 POLL FREQUENCY DESTINATION 8 HEX 0 POLL FREQUENCY DESTINATION 9 HEX 0 POLL FREQUENCY DESTINATION 10 HEX O ffff uH wu H I e SS SS S35 3533533 3 CONTINUE THIS SELECTION YES NO EDIT THIS SELECTION YES NO 2755 2 55 September 1995 2755 2 55 September 1995 Figure 4 Sample PLC Program PLC 5 15 25 Etc to 2760 RB 000 N7 0 1 13 15 Write Data N7 0 N7 5 Block Transf
10. t LED will flash green e The Port 1 LED will be dim green In addition the yellow Communication LED on the 2755 DS DD Decoder will be Solid ON The bar code data will appear in the PLC data table in the following format 0 BYTE COUNT IN BCD BYTE COUNT IN BCD 1 DATA SOURCE DATA DESTINATION 2 ait NUMBER ALWAYS NODE NUMBER 3 DATA DATA 4 DATA DATA 5 DATA DATA See the 2760 RB and the 2760 SFC2 User Manuals for further information Figure 2 2755 DS DD Host Communications Configuration Screens 05 BAUD RATE 19200 BITS GHRR 8 Data Stop PARITUY Even HOST PROTOCOL DH485 ASCII 1 DEUICE BDDRESSx 1 ACK CHAR Mone 255 GHAR Mone 255 faue and Restart required for these parameters to take effect SCANMER f SCANNER B START SCAN GHAR Mone 255 Mane 255 SIOP SCAN CHAR Hone 255 None 255 LARGE BUFFER SEND HOST MESSAGE At End of Trigger TRANSMISSION CHECK Mone START GHARAGTER None 455 SOURCE IDENTIFIER for lt 0 2 CAD e HEADER STRING FIELD DELIMITER None 255 WIMBER OF FIELDS MESSAGE SEND SYHBOLOGY No SEND PACKAGE COUNT SEND BAR CODE STRINGS Yes SEND DECODER PERFORMANCE END MESSAGE DEFAULT HO READ STRING FIELD FIELD NUMBER NO READ REPLACEMENT STRING NUMBER NO RERD REPLACEMENT STRING 1 9 Important When configuring the 2760 RB module first select Main Menu Selection 90B to reset the unit to factory defaults Then
11. the 1771 chassis are set up for two slot addressing There are other 2760 RB configuration features available and not used See Publication 2760 ND001 for additional information The 2755 DS DD decoder configuration shows only the screens necessary to establish communications to the 2760 RB module Other decoder configuration parameters such as selecting bar code symbology or a decoder trigger method are beyond the scope of this document See the Decoder User Manual Publication 2755 833 for additional information The PLC program is a minimum mode example showing that data can be moved into the PLC Use the following table as a configuration guideline when using the examples shown in this document PLC 5 COMPATABILITY PLC 5 15 25 New Generation PLC 5 etc Series A Rev C or above only Set BT Compatibility Bit S26 4 while in program mode Use example PLC program shown Figure No 4 2760 RB In Use Series A Rev G or below Follow example PLC program as Seres A Rey Hor OW In Figure Add ladder logic using IIN update of RB 4 BTR must be before BTW Refer to Figure Above No 5 2755 2 55 September 1995 Bulletin 1771 Rack gt Dumb Terminal or PC Running Terminal Emulation Software Te Figure 1 Configuration 2760 SFC2 2760 RB PLC 5 1771 P4 Power Supply Bulletin 2755 L Scanner DH485 Beldon 98
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