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7. COMMUNICATION WITH PROGRAMMABLE CONTROLLER CPU
/ M E L S E C - A
7.7 Remote RUNISTOP of PC CPU
The PC CPU can be switched between RUN and STOP b y the AD51
using the following system subroutines.
(1
)
Precautions for remote RUNISTOP
Note that a "remote error" is flagged i f a remote RUN (or
STOP) signal is given t o a PC CPU which has already received
a remote STOP (or RUN) signal from a separate unit, e.g.
AJ71 C24.
Processing
Requests remote R U N of PC
CPU.
Recluerts
remote
STOP of PC CPU.
Remote RUNISTOP commands from the AD51 are valid as
follows for different CPU key switch positions:
System Subroutine
SKR
SKP
Item
PC CPU Key Switch Position
RUN
I
STOP
I
PAUSE
1
STEP-RUN
PC CPU
Command
Remote RUN
R U N
STOP
PAUSE
STEP-RUN
from
Remote STOP
I
r
I
STOP
I
STOP
1
STOP
STOP
Remote R U N
Remote STOP
3)
The clearing o f data memories on receiving a remote run
instruction depends on the states o f special relays M9016
and M9017.
I
Special Relay
/
Data Memory State
I
OFF
I
OFF
I
CPU is
run without clearing data
memory.
I
I
OFF
I
ON
I
Data memory
i s cleared outride the
latch range set in
parameters.
(Link
image
is
not
cleared.)
I
ON
ONIOFF
CPU
is run a f t e r
data memory i s cleared.
Always reset special relays
M9016
and
M9017
where data memory clearing is
not required.
4 ) Resetting the PC CPU during remote RUNISTOP control
(either w i t h the keyswitch or b y powering down and up)
causes the remote signal t o be removed and the PC CPU t o
revert t o the mode detected b y its key switch.
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