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Communication between M172 and TM172DCL

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jyoon
Crewman jyoon
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‎2020-07-14 08:27 AM
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‎2020-07-14 08:27 AM

Communication between M172 and TM172DCL

Hi,

 

I am trying to connect TM172DCL (Display for M172) but I keep getting Modbus Comm error.

 

Current Setting:

1.  I am using RS485-2 as a Modbus Master on M172.

2.  Created a Generic Modbus Device for TM172DCL.

3.  Since they both have the same power source, I left ground disconnected.

4.  Installed 120 ohm to TM172DCL.  Maybe I need to install 120 ohm on M172 as well?

 

Can you tell me what I am doing wrong?  I need to be able to exchange variables between them but It seems that RS485-2 link on M172 is dead.

 

Thank you for your help!

 

Jung

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LeTomas
Ensign LeTomas Ensign
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‎2020-07-16 07:24 AM
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‎2020-07-16 07:24 AM

Re: Communication between M172 and TM172DCL

Hi @jyoon ,

 

When I work with the M172D I usually use it as a master in the communication because for me is much simpler to exchange the information between the devices.

Take a look on this presentation of how to connect both devices (M172 plc as slave): 

https://schneider-electric.box.com/s/ld78b6pxs08l0tb7qgz3eix01hha5wpt

Project: https://schneider-electric.box.com/s/kcwhv7kxtat0shm20njyzzc87azx4dkk

 

In your case if something is not working you should try to check:

 

1) The connection from the M172 RS-485 2 to the display (you can check the connection in my presentation but with RS 485-1).

2) The Actual values on the modbus configuration on the M172D and the PLC (They must match).

3) Verify the registers that you want to read from the M172D.

 

I hope this helps you 👍

 

See Answer In Context

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LeTomas
Ensign LeTomas Ensign
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‎2020-07-16 07:24 AM
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‎2020-07-16 07:24 AM

Re: Communication between M172 and TM172DCL

Hi @jyoon ,

 

When I work with the M172D I usually use it as a master in the communication because for me is much simpler to exchange the information between the devices.

Take a look on this presentation of how to connect both devices (M172 plc as slave): 

https://schneider-electric.box.com/s/ld78b6pxs08l0tb7qgz3eix01hha5wpt

Project: https://schneider-electric.box.com/s/kcwhv7kxtat0shm20njyzzc87azx4dkk

 

In your case if something is not working you should try to check:

 

1) The connection from the M172 RS-485 2 to the display (you can check the connection in my presentation but with RS 485-1).

2) The Actual values on the modbus configuration on the M172D and the PLC (They must match).

3) Verify the registers that you want to read from the M172D.

 

I hope this helps you 👍

 

See Answer In Context

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jyoon
Crewman jyoon
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‎2020-07-20 10:28 AM
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‎2020-07-20 10:28 AM

Re: Communication between M172 and TM172DCL

Hi, @LeTomas 

 

Thank you very much for your help.  I followed it and everything is working fine now.

 

Jung

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S_Stolyarov
Lieutenant JG S_Stolyarov
Lieutenant JG
‎2021-01-18 11:28 PM
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‎2021-01-18 11:28 PM

Re: Communication between M172 and TM172DCL

Thank you for sharing your experience it is very useful, I'll keep in mind this.

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Helen562
Helen562
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2 weeks ago
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2 weeks ago

Re: Communication between M172 and TM172DCL

I'd like to receive news and commercial info from Schneider Electric and its affiliates via electronic communication means such as email. 

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