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4.13 Get Communications Event Log (FC: 12)
4
MODBUS(R) STANDARD FUNCTIONS
2) When sending a response message
The slave (QJ71MB91) stores the communications event log after sending the
response message.
For the relevant communications event, "1" is stored.
* 1 While the occurrence of busy status (exception code 05H to 07H) is stored for the MODBUS
protocol, "0" is stored for the QJ71MB01 because this kind of events does not occur in it.
3) When switching to the listen only mode
The slave (QJ71MB91) stores the communications event log when switching
to the listen only mode.
04
H is stored to the communications event log.
4) When processing restart communications option
The slave (QJ71MB91) stores the
communications event log when processing
the restart communications option.
00
H is stored to the communications event log.
(b) Clearing the communications event log
The communications event can be cleared by either of the following:
Clear setting of the communications event log with the restart communications
option ( Section 4.11.2)
Power OFF ON, or programmable controller CPU reset
Figure 4.79 Communications event at response message transmission
Figure 4.80 Communications event when switching to listen only mode
Figure 4.81 Communications event when processing restart communications option
b0b1b2b3b4b5b6b7
000100 1/0 1/0
Message error (Exception code 01H to 03H)
Processing interruption (Exception code 04
H)
Unused (Fixed to 0) *
1
Fixed to 1
Unused(Fixed to "0")
b0b1b2b3b4b5b6b7
00100000
b0b1b2b3b4b5b6b7
00000000
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