Interface modules 1

[jolielily]

Hi All:
I just do the control system design not long, I am very confused about those digital interface modules.
What is the difference between digital fusible interface modules and digital relay interface model? Can they replace each other?
Thanks for the help.

 

[jolielily]

Also another question, what is external relay module?
I am very confused about those PLC wiring system , terminal blocks, and interconnection , are there any books or references related to those which I can read?
Thanks for the help.

 

[xyzz]

You have to clarify what modules you are asking about, in both questions.
It sounds like not about PLC modules, or your terminology is very incorrect.

 

[jolielily]

Thanks for your reminder, xyzz,
I use AB control wiring system, I see the manual here,
About digital interface modules (IFMS), it has different types: digital interface modules (IFMs) Feed-through; digital interface modules (IFMs) LED-indicating; digital interface modules (IFMs) fusible ; digital interface modules(XIMs) Relay.
What is the difference about those modules and where should they use for ?
Thanks for the help.