Wireshark-users: [Wireshark-users] capture traffic to PLC

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From: Marius-Simion Cristea <cristea12@xxxxxxxxx>
Date: Sat, 21 Apr 2012 08:25:01 -0700 (PDT)
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!