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MP377 Comms Issues

3/24/2011 8:00 AM	Rate (0)
Fernex Posts: 1 Rating: (0)	Greetings all, I am hoping for some help with a communications issue I am having with an MP377 and a S7-300 PLC. Background:- My client has has an MP370 and S7-300 PLC install and working without issue for many years now. They ahve been communicating with a MPI connection. Recently the MP370 failed due to power supply issues. Ths unit was replaced with an MP377. I have converted and trasnfered the original program to the newHMI without too many issues. When we connect the new HMI, we are not getting any data sent from the PLC. All analog data reads '0', and all digital data is 'Off'. If I navigate away from a display, and then return, then the analog data will change to '######'. All screen graphics and navigation seem normal, so I am convinced it is a communications issues. The comms settings have remained the same from the original HMI. Does anyone have any ideas on where I should be looking to solve these issues. THis project is becoming time sensitive so a speedy reply would be appreciated. Cheers Rohan D.
Fernex Posts: 1 Rating: (0)
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3/24/2011 8:21 AM	Rate (0)
umencho Diamond Expert Joined: 3/21/2006 Last visit: 3/17/2025 Posts: 10239 Rating: (1183)	Hello Rohan, Check again the MPI address and the connection. Best regards, Hristo Mihalev

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3/24/2011 8:47 AM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 3/18/2025 Posts: 8897 Rating: (1186)	Dear Rohan, Perhaps this link might help: how do you configure a connection between WinCC flexible Runtime (PC/Panel) and a SIMATIC S7-300/S7-400 via Profibus/MPI? Best regards, Wizard

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