capture traffic to PLC

[Marius-Simion Cristea <cristea12 () yahoo com>]

Hi,

I want to capture the traffic (the commands) that are sent from a SCALANCE touch panel emulator to a PLC. The 
configuration of my network looks like this:

Emulator---HUB---Scalance_Switch---PLC
  |
PC (Wireshark)

I'm giving commands to the PLC from the emulator, the PLC responds, but I can't capture any of those commands using 
Wireshark, i'm seeing only ARP, LLDP, PN-DCP packets and some other broadcast packets.

Is it possible to capture those commands using Wireshark? if so, what am I doing wrong? because, as far as I know the 
hub must send all the packets that are meant for the PLC also to the PC.

Thanks!
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