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
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