Table of Contents
Advertisement
3
SPECIFICATIONS
Request from master
FREEZE mode signal (X07)
FREEZE LED
3 - 7
(d)
The SYNC receive signal (X06) turns off if a communication time-out error
occurs due to a stop of communication with the master station while the
SYNC receive signal (X06) is on.
However, if the communication watchdog timer setting in the master station
side parameters is "invalid", the SYNC receive signal (X06) does not turn
off since a communication time-out error does not occur. (The output data
in the output receive area is held.)
Communication watchdog timer
Setting in Master Station Side
Parameters
Invalid
Valid (2 to 65025)
The communication watchdog timer setting can be confirmed in the
"Current communication watchdog timer value (buffer memory address:
8D1
)" of the QJ71PB93D.
H
(7) FREEZE mode signal (X07)
(a)
The FREEZE mode signal (X07) turns on when the QJ71PB93D is placed
in the FREEZE mode by a FREEZE request from the master station.
(b)
The FREEZE mode signal (X07) turns off when the FREEZE mode is
terminated by an UNFREEZE request from the master station, a
communication stop or a CPU reset.
(c)
The FREEZE LED turns on/off in synchronization with the on/off of the
FREEZE mode signal (X07).
Communication time-out error occurrence
FREEZE request
Off
Operation at Master Station Fault
No error
(SYNC receive signal (X06) remains on)
(SYNC receive signal (X06) turns off)
UNFREEZE request
On
MELSEC-Q
Off
3 - 7
Advertisement
Table of Contents
