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MELSEC-Q
3 SPECIFICATIONS
(4) Master Function Communication Status (address 01B0
H
/432)
The higher and lower bytes indicate the following master communication status:
(a) Higher byte
This byte indicates the I/O communication status of the QJ71DN91 master
function. The values in Table 3.16 are stored according to the
communication status.
Table 3.16 I/O communication status
Value Name Operation
00
H
Offline Being initialized
40
H
Stop I/O communication being stopped
C0
H
Operate I/O communication in progress
When the power is turned ON, the status of the master function automatically
changes from Offline to Stop if the auto communication start setting in the
buffer memory address 0631
H
is 0. The status automatically makes
transitions from Offline to Operate if the setting is 1.
If a reset message is received from the DeviceNet network, the status
automatically returns to Offline and makes transitions from Offline to Operate.
Offline
Stop
Operate
(b) Lower byte
This byte indicates the network's communication status. Each bit is turned
ON/OFF as follows, according to the communication status.
Bit 7
There is a station with
a communication error.
Parameter error
Network has a fatal problem
and communication cannot be
continued.
Always sets to OFF.
These problem occurred when the
corresponding bits were ON.
Always sets
to OFF.
Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0