WAGO 750-643, Manual

Page: 20 / 30

20 • 750-643 [MP-Bus Master Module]
Data transfer
WAGO-I/O-SYSTEM 750
I/O Modules
MSG_CODE DPID DATA Description
ERR=0 Communications request for request-response telegrams.
The module returns the transmitted MP-Bus command byte
with the reply.
0 D0 Master command sent.
0 D1-4 MP-Bus telegram according to specification without length and
cross parity.
0 D5 TNO
1
D0-D4 MP-Bus telegram according to specification without length and
cross parity.
1 D5 TNO
ERR=1
0 D0 Error
number
0 D1 Extended error status
0 D2-D4 not used
0 D5 TNO
1 D0-D4 not
used
K2F_COM_T2 5
1 D5 TNO
ERR=0
Module test (transparent MP-Bus communication).
0 D0 Function macro ID.
0 D1-4 Macro-specific result parameters.
0 D5 TNO
1
D0-D4 Macro-specific result parameters.
1 D5 TNO
ERR=1
0 D0 Error
number
0 D1 Extended error status
0 D2 Function macro ID.
0 D3-D4 not used
0 D5 TNO
1 D0-D4 not
used
K2F_FM 6
1 D5 TNO
2.1.1.8.3 Use of the module 750-643 with programmable fieldbus controllers
Appropriate IEC 61131-3 function blocks and libraries are available for
WAGO-I/O-
PRO
32 and WAGO-I/O-
PRO
CAA in order to read out the
process data of the MP-Bus Master Module with a programmable fieldbus
controller (PFC).
In the WAGO-I/O-
PRO
application, the "FbMpBusMaster" function module
accepts the data packets from several module bus cycles (module bus
communication).
After the packets have been assembled to form a telegram, this module checks
the telegram for errors (protocol security).
In order that the master can communicate with the slaves, each slave must be
assigned a unique address. The nodes are addressed with the
"FbMpBusAddressing" module.
Further function modules subsequently undertake the evaluation and
processing of the telegram content.