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【正文】 a token passing network.Now I can39。t remember for the 113 controllers (it is the case for 434/534 controllers) there are two slide switches on the font panel which changes the munication parameters between what is configured in Concept vs dafult settings of 9600,8,E,1. Check these vs Concept HELP files. Posted by Rajesh Sharma on 17 January, 2005 9:01 amDear Mr. Brad,I full agree with you that Modbus PLUS should not municate on RS232 cable. But we all Foxboro,ABB engineers had seen by issuing query amp。 getting response on Modbus Plus port. We also confused on this behaviour. Request Pl. answer if you have. We don39。t have word IMPOSSIBLE because there are many cases where Vendors says it is impossible amp。 we had seen same in front of them. Posted by Anonymous on 13 January, 2005 3:47 pmDear Rajesh,What you observed like munication, that was something else. Modbus Plus is an RS 485 based network with peertopeer munication.Modbus Port is using RS232 signaling and different munication stack. Master polls the slaves after each other. In your case the Modbus Port 1 acts as Master port. Your DCS devices as a slave, I think.Ignore that munication signals. Posted by on 13 May, 2009 1:24 amModbus Plus protocol uses RS485 for its multidrop feature and is a MasterSlave protocol. It is supported by many manufactures. I have found it standard (or an option) in many medium voltage protection relays and meters. I suspect Foxboro and ABB offer a Modbus Plus interface module. These interfaces will allow engineers to configure tables to specify blocks of boolean/integers/real/word data to amp。 from the PLC.If your DCS has a serial port then use Modbus protocol to pass data between it and the PLC. It uses RS232 for a pointtopoint serial connection. Connect using an off the shelf serial cable c/w null modem between the DCS serial port and the Quantum CPU534 Comm 1 port or buy a Schneider Modbus munication cable. Set the PLC slider selector switch to RTU and configure munication settings to 9600, even, 8, 1.Have you considered Modbus Plus over Ethernet (MBE)? Posted by balberoz on 25 January, 2010 10:47 pmThe cable connection principle are the same device application will be used cross cable connection while for the different application (ex: Pc to sw) will be used direct connection cable.tq Posted by on 27 January, 2010 9:12 amCrossovers depend upon what the devices are. DTE to DCE (Data Terminal Equipment to Data Communication Equipment) connections are 1:1. EG PC to Modem, PLC to MODEM. However, when connecting DTE to DTE you will likely require a crossover EG PLC to PC or HMI. However, with the wide interpretation of serial port pinouts and lack of standards you will discover expections.Check the pinout designations and look for connection examples. Your use of this site is subject to the terms and conditions set forth under and the. Please read those terms and conditions carefully. Subject to the rights expressly reserved to others under Legal Notices, the content of this site and the pilation thereof is 169。 19992011 Nerds in Control, LLC. All rights reserved.Users of this site are benefiting from open source technologies, including, and. Be FortuneKeep America beautiful. Swallow your beer cans.Help keep our servers running...16 /
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