ESD failure on Anybus Compactcom Modbus/TCP


#1

Hi,

We are having an issue with passing ESD using the Anybus Compactcom Modbus/TCP module. AB6213-B
We have the PE pad in our PCB but it looks like there is a 1MOhm resistor between the Ethernet shell and the PE pin on the anybus module. We do not see this resistance on other Compactcom modules we use.

Regards,
Karthik


#2

Hi Karthik,

Can you show us which points you’re measuring this 1MOhm resistance from?


#4

Modbus

Between the points shown by the red arrow


#5

Hi @kkarkala,

I just went through a variety of our compact coms and it looks like it is standard to have a 1M Ohm resistance between the PE and the shell. What seem to be the issues you’re running into with the ESD?