Modbus Plus language objects
Explicit exchange language object
Introduction
Word objects
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This page describes all the language objects for explicit exchange in Modbus Plus communication that can be displayed or modified by the application program (PL7
Micro/Junior/Pro ; Communication applications ; Volume 1).
The table below shows the different word objects for explicit exchange.
Object (1) Function
%MWxy.MOD.2
Module status
%MWxy.i.2
%MWxy.i.3
%MWxy.i.4
Standard channel status
Specific channel status
Status of link layer
Specific channel status
Peer Cop
Meaning z z z z z z x0 = 1: defective module x1 = 1: functional error (error between the processor and the module, adjustment or configuration error, …) x2 = 1: terminal block fault (not connected) x3 = 1: self-tests running x4 = 1: reserved x5 = 1: error in hardware or software configuration (the module present is not the one declared in the configuration, the submodules are not compatible) x6 = 1: module missing x7 = 1: error in one of the sub-modules z z z z z z z z z z x0 = 1: only station on the network x1 = 1: not used x2 = 1: transmission line error x3 = 1: not used x4 = 1: internal software fault x5 = 1: hardware or software error or no configuration x6 = 1: processor communication error x7 = 1: application fault (double station address)
Byte 0 z z z
= 0: initialization phase
= 3: awaiting token phase
= 4..10: normal status z z z z
Byte 0 z = 0: station being tested
= 32: normal status
= 64: no token
= 96: only station (idem x0 of %MWxy.i.2)
= 128: two stations have the same number
(idem x7 of %MWxy.i.2)
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Modbus Plus language objects
Object (1)
Key
(1)
Function Meaning
Address xy.i
z z z x: corresponds to the rack number y: corresponds to the module number i: corresponds to the channel number
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