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S7 200 connection with PC

2/15/2011 7:50 AM	Rate (0)
JainPlc Posts: 3 Rating: (0)	Hello All, We wish to connect S7 200 based system to our PC based SW. Our system is developed by third party and we don't have any information about the software running in the PLC. I am new to PLC ,Can somebody suggests that, do we need to something in order to comunicate all tags value? As per my understanding s7/200 communicates over Modbus and all the tags are by default communicated from the PLC? Thanks, Manish
JainPlc Posts: 3 Rating: (0)
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2/15/2011 8:02 AM	Rate (0)
umencho Diamond Member Joined: 3/21/2006 Last visit: 3/30/2025 Posts: 10239 Rating: (1183)	Hello Manish, Take a look at How can you read data from the S7-200 CPU via the OPC client Excel with the OPC server PC Access and archive it in an Access database? best regards, Hristo Mihalev

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2/15/2011 8:43 AM	Rate (0)
JainPlc Posts: 3 Rating: (0)	Thanks Hristo, This seems to be what I was looking for. But as I have mentioned we don't have any access to the PLC program, how can I monitor value ofall the tags. Are all the tags, by default enabled to transmit message over modbus/profibus? Thanks, Manish
JainPlc Posts: 3 Rating: (0)
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2/15/2011 9:13 AM	Rate (0)
umencho Diamond Member Joined: 3/21/2006 Last visit: 3/30/2025 Posts: 10239 Rating: (1183)	Unfortunately you need info about description of each tag or to have access to the PLC in order to "find" alone this. Best regards, Hristo Mihalev

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2/15/2011 10:42 AM	Rate (0)
JainPlc Posts: 3 Rating: (0)	Sorry, I may be asking very basic question. What do you mean access to PLC to find info about the tags? How can I check if I have access to the PLC? Cheers, Manish
JainPlc Posts: 3 Rating: (0)
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2/15/2011 2:59 PM	Rate (0)
Greg_E Posts: 88 Rating: (2)	Hi Jain, At least you need a Microwin step7 software and a PPI-PC cable, install connect and upload the program. and have a long journey to find the registers(PLC/Modbus). Best Regards, Greg.
Greg_E Posts: 88 Rating: (2)
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