COMM: AB Micrologix 1100 Modbus Communication with Telemecanique Motor Starter

Tue Oct 13 15:47:31 EDT 2009

==> Automation List post by aditya...
To view or reply to this thread: http://www.control.com/thread/1255024226#1255459213

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Re: COMM: AB Micrologix 1100 Modbus Communication with Telemecanique Motor Starter
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I've read the entire manual for the LULC031(the modbus module in the TeSysU starter) and i'm trying to setup a basic ladder logic program in RSLogix500. 

In the manual it says there is a 16-bit register, 457, that has bits that change when the rotary handle on the starter is On or Tripped. I thought i would use this mechanical input and display their states on the LCD of the 1100 processor. 

I only have 2 rungs in my code - one for the LCD and one for the MSG. I have setup the Message such that it uses Channel0 (setup for Modbus Master) and following settings:

* Modbus Command: 03 Read Holding Registers (4xxxx)
* Data Table Address: B3:0
* Size in Elements: 1
* Data: 16 bit

* Message Timeout: 2 (seconds)
* MB Data Address: 457
* Slave Node Address : 1
* Modbus Address : 40458 (this field is automatic based on "MB Data Address")

Am I correct in understanding that by specifying B3:0 and the data to 16 bit, when the data returns it will populate B3:0/0 to B3:0/15? 

I am unsure of the MB Data Address field. The modbus addressing of 400001 to 49999 versus the register number 457 is confusing me. 

Does anyone see whats wrong this configuration? I keep getting Error Code 37 (hex) - Message timed out in local processor. 

Also, on the TeSys starter, I have the COMM and ERR lights flashing alternately. According to the manual this means "Bus parameters are being initialized" 

Thanks.
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