Hi,

I'm pretty new to controls and I am trying to connect an absolute encoder (BEISensors CHM5 Link to the encoder is below), to a S7-1214 I have a CM1241 to connect the encoder to the PLC, however, after piecing together what I can from the forums i'm starting to think i'm barking up the wrong tree.

Can anyone give me advice on what I would need to do to get this setup to work?

Absolute Encoder 

The CM1241 is a communication module. I don't think it can be used for encoder input.

You need something like the PosInput modules:

 Hello,

I have a similar problem. I'm making an application using 5 positioning measuerment systems, which work on 5V TTL, so I can't use signal board, because it has only 4 DI. I have a 1214C DC/DC/DC CPU and idea was to read value via 1241 RS422/485 module. Is it even possible to use 1241 module as a high speed counter and to read the value?

If it helps I have a Hiwin PM-B-05-0D-G-20-01 measurement system.

0_Einstein

You are correct about the CM1241 not being useful for encoder input of the type already purchased and linked above by OP/TS.

The DI modules I mentioned can be configured as high speed counter inputs, and collectively for A/A-/B/B- for speed and direction as quadrature encoder input. 

miami

The CM1241 is a communication module. I don't think it can be used for encoder input.

You need something like the PosInput modules:

• 6ES7138-6BA00-0BA0
  SIMATIC ET 200SP, TM POSINPUT 1 Counter and position detection module for RS422 incremental encoder or SSI absolute value encoder, 2 DI, 2DQ
• 6ES7551-1AB00-0AB0
  SIMATIC S7-1500, TM POSINPUT 2 Counter and position detection module for RS422 incremental encoder or SSI absolute value encoder, 2 channels, 2 DI, 2 DQ per channel

As far as I know, there is no version for central use with S7-1200. You will need to use a ET200SP (PosInput1) or ST200MP station (PosInput2).

An other solution is a PROFINET encoder like 6FX2001-5.N...

 

As I wrote, I think: No

RS422 only defines the electrical characteristics (which signal is high, which is low), but not what kind of information is transferred. And the CM1241 provides a serial interface and not a encoder input.