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Subject: Re: S7plc driver - PV block receiving problems
From: Dirk Zimoch <dirk.zimoch@psi.ch>
To: <tech-talk@aps.anl.gov>
Date: Thu, 9 Feb 2017 13:37:11 +0100
Maybe the block your PLC is sending has a different size than what you expect? Or the size is not constant?

Have a look with wireshark (or ethereal or tcpdump) what the PLC is really sending.

Dirk

On 28.01.2017 12:12, Gianluca Borgese wrote:
Dear All, I'm using the s7plc driver to monitor and control an RF
modulator which has a PLC sending a 253byte data array and receiving a
16byte data array to/from my IOC. I did some test using the PLC server
emulator (server.tcl) which was into the s7plc folder and all is nice
and working right! I obtain the right process variable (PV) values I
expect!!! But when I connect my IOC to the real PLC I have problems with
the PVs. The PV values sometimes are correct and often wrong! Do you
have any idea about the possible causes? Thanks in advance. Regards,
Gianluca


References:
S7plc driver - PV block receiving problems Gianluca Borgese

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