Details Concerning Explicit Exchange Language Objects for a Modbus Function
(Original Document)
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At a Glance
The following tables present the language objects for communication in master and slave Modbus mode. These objects are not integrated in the IODDTs.
List of Explicit Exchange Objects for Master Mode
The table below shows the explicit exchange objects.
Address
Type
Access
Meaning
%MWr.m.c.4
INT
R
Number of responses received without CRC error
%MWr.m.c.5
INT
R
Number of responses received with CRC error
%MWr.m.c.6
INT
R
Number of responses received with an exception code
%MWr.m.c.7
INT
R
Number of master messages sent without response
%MWr.m.c.8
INT
R
Number of transmissions broadcast
%MWr.m.c.9
INT
R
Number of receipts with NACK
%MWr.m.c.10
INT
R
Number of master messages repeated
%MWr.m.c.11
INT
R
Number of character errors
List of Explicit Exchange Objects for Slave Mode
The table below shows the explicit exchange objects.
Address
Type
Access
Meaning
%MWr.m.c.7
INT
R
Number of messages for the CPU
%MWr.m.c.8
INT
R
Number of receipts broadcast
%MWr.m.c.10
INT
R
Number of messages received during Slave busy or LOM