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5.3 Slave Function
5.3.2 MODBUS(R) device assignment function
5
FUNCTIONS
(b) Specifying the error status read device
Users can specify the data to be read out as an exception status when the
QJ71MB91 (slave) receives Read Exception Status (FC:07) from the
master.( Section 7.3.4)
(c) Specifying access target when mounted to MELSECNET/H remote I/O station
For the case where the QJ71MB91 is mounted to a MELSECNET/H remote I/O
station, the access target can be specified.( Section 7.3.5)
The access target can be selected from the MELSECNET/H remote master
station and the MELSECNET/H remote I/O station.
Figure 5.14 Error status read device and programmable controller CPU device
M100
M107
M100 to M107
Device
R
Programmable
controller CPU
No sequence
program required
01H
QJ71MB91 (Slave function)
Error status read device specification
Device memory
Exception
status
Request message
(Sends Read Exception Status (FC:07))
Receives response message (exception
status 01
H
)
MODBUS
Master
device
RS-232, RS-422 or RS-485
to
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