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3
SPECIFICATIONS
BBLKRD start request signal (Y0A)
BBLKRD start request acceptance
completion signal (X0A)
BBLKRD instruction
3 - 8
(d)
The FREEZE mode signal (X07) turns off if a communication time-out error
occurs due to a stop of communication with the master station while the
FREEZE mode signal (X07) is on.
However, if the communication watchdog timer setting in the master station
side parameters is "invalid", the FREEZE mode signal (X07) 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
(8) BBLKRD start request acceptance completion signal (X0A)
(a)
This signal is used as an interlock condition signal to execute the dedicated
instruction BBLKRD.
(b)
When the BBLKRD start request signal (Y0A) is turned on in the sequence
program, the BBLKRD start request acceptance completion signal (X0A)
turns on.
(c)
When the BBLKRD start request signal (Y0A) is turned off in the sequence
program, the BBLKRD start request acceptance completion signal (X0A)
also turns off.
(9) BBLKWR start request acceptance completion signal (X0B)
(a)
This signal is used as an interlock condition signal to execute the dedicated
instruction BBLKWR.
(b)
When the BBLKWR start request signal (Y0B) is turned on in the sequence
program, the BBLKWR start request acceptance completion signal (X0B)
turns on.
Operation at Master Station Fault
No error
(FREEZE mode signal (X07) remains on)
Communication time-out error occurrence
(FREEZE mode signal (X07) turns off)
MELSEC-Q
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