Re: S7plc driver - PV block receiving problems

[Dirk Zimoch <dirk.zimoch@psi.ch>]

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