User Manual

174 • Appendix
Mailbox Command References
WAGO-I/O-SYSTEM 750
I/O Modules
6.3.6.3 Read Diagnostic Information (GetStatusMessage, 0xD2)
The command returns diagnostic information on occurring errors and warn-
ings from the local bus module.
When querying, a concrete object identification MBX_OBJECT_ID must be
indicated. The response then always contains the same MBX_OBJECT_ID
plus a defined status report MBX_STATE_MESSAGE. If the object identifi-
cation remains unknown, the system returns the information byte for executing
the command MBX_CMD_RESULT and the value
MBX_CMD_INVALID_ARG.
Each defined MBX_OBJECT_ID is always uniquely assigned a current status
report (usually "OK"). If an event occurs, the status report is changed each
time to mirror the most recently occurring event. The status report of an indi-
vidual MBX_OBJECT_ID is always overwritten with the next more recent
event as long as it is not "OK". The prioritization of error message before
warning message must always be observed.
Note
In the cyclical status report (C/S byte, LED activation), errors/warnings are
only displayed as long as the disturbed status lasts. The status report, on the
other hand, remains until it is overwritten (new message for the same Objec-
tID occurs).
Errors always have a higher priority than warnings in the display.
Only the status of WAGO devices is recorded.
Conditions
Mailbox size Operating mode/profile Device role
6 12 18 Config.
Real-
time
Ad hoc Master Slave
Save
config.
Restart
● ● ● ● ● ● ● ● - -
Request
Byte 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
0 MBX_GETSTATUSMESSAGE
1 T -
2 MBX_OBJECT_ID (LSB)
3 MBX_OBJECT_ID_LO