Dear all

Does s7 1200 have limitation for number of analog module expansion ( 6ES7 231-4HF30-0XB0)

or i can expand until i reach  8 SM ( to the maximum ).

Regards.

Sorry for not mentioning my cpu it is 1214c; but my Doubt is can i use 8 analog input SM or there is restriction.

Regards

The software does not seem to have a problem.
Have you worked out the power budget yet?..
Look at appendix B of the S7-1200 system manual.

The below picture also has one SB card connected for analog,
you also have built-in analog inputs (x2).

Possibly the TIA software does not calculate it for you.
From a quick calculation the power budget does not work for the design in the below picture.

There are devices available {somewhere} that has only analog inputs. These devices communicate the resulting values via Modbus RTU or such communications.

Also consider.. if you have VSD (variable speed drives) that are communications capable, then you can have the VSD forward the analog value to you.

Also consider that several S7-1200's and/or LOGO (OBA7 / OBA8) can be networked.

w

Tank you for quick Response

What if i use 6EP1332-1SH71 .power supply.

Regards

Dear WILLIAM_B;

would you please give me the name of those analog signal ... equipements you mentioned?

and i am not clear about

"Also consider.. if you have VSD (variable speed drives) that are communications capable, then you can have the VSD forward the analog value to you."

does VSD can be used as analog input module ? please make it for bigners.

Regards.

ADDIS ABABA

Tank you for quick Response

What if i use 6EP1332-1SH71 .power supply.

Regards

Please get the technical manual for the S7-1200.
Read the appendix I have suggested - everything is given there.

What I will tell you is that the CPU1214 "transmits" power through the communication line to the SM and SB cards.  It is in on the 5V and 24V lines. That has nothing to do with the external 24Vdc power supply.

Where the CPU "transmits", the extension cards uses power (and the CPU does too). Appendix A in the manual gives the values you need.

I do not know which hardware you intend to use.. so have a look at the calculations and numbers yourself. I predict you will not be able to use more than x5 analog cards.. but I am not sure.

w

ADDIS ABABA

Dear WILLIAM_B;

would you please give me the name of those analog signal ... equipements you mentioned?

and i am not clear about

"Also consider.. if you have VSD (variable speed drives) that are communications capable, then you can have the VSD forward the analog value to you."

does VSD can be used as analog input module ? please make it for bigners.

Regards.

Sorry I can not give you more information. Please search on the web.

It is possible to read the inputs and outputs that are connected to the motor drives / VSD / inverter. It differs from drive make to drive make, but some manufacturers call it "pass-through". In principle your PLC reads the register that gives the status of the input and outputs.

If you need a beginners explanation on how to do this.. then neither of these two solutions are for you - you will need to much step-by-step explanation. .. and I am not trying to be rude when saying so.

w