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MODBUS TCP COMMUNICATION

Created by: Yalcin at: 11/26/2012 8:39 AM (6 Replies)

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11/26/2012 8:39 AM	Rate (0)
Yalcin Experienced Member Joined: 12/25/2006 Last visit: 7/18/2024 Posts: 40 Rating: (1)	Hi, I'm using cpu 3172pndp v2.5 and step 7 v5.5 sp2 I have a frigel ping device and connect it modbus tcp. I already inserted the fb102(modbuspncpu) but I dont know how I read the input registers. I have 4 modbus slave address 1,2,3,4 and how I select the adress and registers codes can anybody help me.. Attachment modbuspnblock.JPG (413 Downloads)
	automation and machine desing, project manager, drawing,programing, and automation responsable
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11/26/2012 1:26 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (323)	Hello Yalcin, is this ping device a gateway from ModbusTCP to ModbusRTU? If yes, the input UNIT at FB102 can be used to address the serial slaves. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (323)
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11/30/2012 8:04 AM	Rate (0)
Yalcin Experienced Member Joined: 12/25/2006 Last visit: 7/18/2024 Posts: 40 Rating: (1)	Thank you for reply but when I select the plc as master, the input unit is to be output and I can't write any data to unit input. Attachment master tcp.JPG (398 Downloads)
	automation and machine desing, project manager, drawing,programing, and automation responsable
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11/30/2012 11:46 AM	Rate (0)
Sakura Silver Member Joined: 9/22/2010 Last visit: 7/25/2024 Posts: 225 Rating: (28)	Hello Yalcin, the text that you marked is for the Modbus server, which is similar to a Modbus RTU slave. If you want to use the PLC as a master, you have to use the FB102 as a client. Regards Sakura
	Last edited by: Sakura at: 11/30/2012 11:46 AM
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11/30/2012 12:50 PM	Rate (0)
Yalcin Experienced Member Joined: 12/25/2006 Last visit: 7/18/2024 Posts: 40 Rating: (1)	Ok. I understand now I selected the s7 acts as server But I wil not select the s7 acts as server then is ok. Is it right. You wil see in the attacment, which parameter I was selected. Attachment tcpwizard.zip (365 Downloads)
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11/30/2012 2:29 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (323)	Hallo Yalcin, I think you ,missunderstood a main point. Modbus TCP is a client/server application. One communication partner is the client which sends requests and the other one is the server it responds to requests. ModbusRTU is a serial master/slave protocol, the master sends a request and the slave responds to a request. So client and master are the equivalents and server and slave. When you connect a Protocol converter ModbusTCP / ModbusRTU to a S7 tocommunicate withseveral ModbusRTU slaves, the converter is Modbus master on RTU side. The S7 is Modbus client on TCP side and the converter is server on TCP side. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (323)
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11/30/2012 2:48 PM	Rate (0)
Yalcin Experienced Member Joined: 12/25/2006 Last visit: 7/18/2024 Posts: 40 Rating: (1)	Thank you for your reply. Is ok now.
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