Root binary inputs - why some module doesn't have these kinds of inputs?

Hi

Are you sure about that?

I don't understand that. why some module doesn't have these kinds of inputs.

for example IO102 doesn't have the same thing and it doesn't need to be connected to the common negative Pol. in the same way.

------------------------------------------------------------------------------------------
Split from Root binary inputs.

SIPROTEC 5 ⋅ Devices Protection, Automation and Monitoring ⋅ Siemens SIPROTEC 5.01 - Edition 4
 

page: 306

Figure 4.3/8 Connection diagram for the IO201

Mike J

Hi

which Manual?

SIPROTEC 5 ⋅ Devices Protection, Automation and Monitoring ⋅ Siemens SIPROTEC 5.01 - Edition 4

page: 306

Figure 4.3/8 Connection diagram for the IO201

I've found the answer in the SIPROTEC 5 Manual.

'The binary inputs contain interference suppression capacitors. In order to ensure EMC immunity, use the
terminals shown in the terminal diagrams/connection diagrams to connect the binary inputs to the common potential.'

This is what I found from SIPROTEC 5 Manual.

So I think it's better to connect the common polarity (I don't know if it's the negative/positive potential) of all the binary inputs together in order to avoid Electromagnetic Interference (EMI), but it's not a must.

Has any body faced to this problem?

I will be grateful if anyone share his/her idea about this matter.

I have no idea about the polarity of common node. Is it negative OR positive polarity?