Hello everyone

I have the following questions that I could not find the answer to:

1- What is the maximum number of CP 341 communication processors are allowed to be installed in one project (1 PLC) and how many are allowed to be in the central rack (8?) and how many are allowed in the et 200 Rack.

2- what is the communication limitation (communication resources) for 

Can it handle more than 10 communication processors? and how many CPs are the maximum for 1 PLC?

3- it says in this link that my cpu has 16 connection resources limit, how many resources does each CP consume? do I need to upgrade my plc to S7-317 to handle up to 32 connections? and would that be enough for 10+ CPs ?

https://support.industry.siemens.com/cs/document/299124/what-is-the-maximum-number-of-ops-that-a-cpu-s7-300-can-communicate-with?dti=0&lc=en-WW

Thank you !

Hi,

See the 6ES7315-2EH14-0AB0 link under entry "Number of operable FMs and CPs (recommended)".

About your question regarding to the number of connections can be used, see the How are the communication resources assigned in the S7-300?

Have you considered to use one CP to handle multiple connections( as suggested in the above article )?

Hello,

It de[ends on CPU type, CP and  CPU specific connection resorces.

What is the maximum number of CP modules that can be slotted in a SIMATIC S7-300/400 station?

Max number of CP341 in S7 300 Rack

Ayman Elotaify

Hello,

It de[ends on CPU type, CP and  CPU specific connection resorces.

What is the maximum number of CP modules that can be slotted in a SIMATIC S7-300/400 station?

Max number of CP341 in S7 300 Rack

 Thanks Mr.Ayman Elotaify

For useful link

 Thank you for your reply.

It says in the product support for 317 2PN/DP that it is recommended to use 8 CP

So it is limited for all S7-300 to 8 CPs?

and in the second link it says : 

is modbus RS 485 point to point communication considered as which type of connection here? is it an S7, S7 standard ? (diffenetely not OP nor PG)

so the main question remains for me is which PLC S7-300 can take 10 CP connections or more ?

MicroMan

Hi,

See the 6ES7315-2EH14-0AB0 link under entry "Number of operable FMs and CPs (recommended)".

About your question regarding to the number of connections can be used, see the How are the communication resources assigned in the S7-300?

Have you considered to use one CP to handle multiple connections( as suggested in the above article )?

 Thank you Ayman for the reply.

The reply was mainly focused on current consumption from the backplane, the second link says that CP 341 does not consume since it has it's own PS, my main focus is on communication restricstions and hardware/software limits of the PLC itself.

Thank you

Ayman Elotaify

Hello,

It de[ends on CPU type, CP and  CPU specific connection resorces.

What is the maximum number of CP modules that can be slotted in a SIMATIC S7-300/400 station?

Max number of CP341 in S7 300 Rack

Does anyone have any info on this?

much appreciated

Still waiting :)

the number of CP341s that one CPU 315-2 PN/DP can handle (communication wise).