To retrieve the IP address of the BMENOC without knowing in advance what it is, a READ_VAR request needs to be sent :

1- The configuration of the character string of the ADDMX should follow this rule : 'r.s.c{127.0.0.1}UnitID' , with :

• r : rack number of the BMENOC
• s: slot number of the BMENOC
• c: channel to be used to communicate with BMENOC
• UnitID : if UnitID is not 255, then you need to type in the number

In my example , my BMENOC is located in slot 3 of rack 0 , the string is '0.3.0{127.0.0.1}100'

Then the IP address used is the loopback IP address of the BMENOC module:127.0.0.1 .

2- Then send a modbus request to the BMENOC with the following parameters :

• Enable : trigger
• ADR : ADDM_TYPE with Unit ID =100
• OBJ : '%MW'
• NUM : 5
• NB: 2
• GEST : exchange management array of 4 INT, do not forget to define a timeout (3rd INT of the array)

The array RECP_NOC[1..2] contains the IP address of the BMENOC in hexadecimal format.

Gepubliceerd voor: Schneider Electric Belgium