10.
10 - 13
OTHER FUNCTIONS
10.6 Remote Operation
With the QnACPU, the operating status of the CPU module can be controlled from
external sources (GPP function, intelligent special function module, remote contact, etc.).
REMARK
In this chapter, a serial communication module is used as an example of an intelligent
special function module.
10.6.1 Remote RUN/STOP
Remote RUN/STOP refers to the function that sets the QnACPU to RUN or STOP from an
external source while the CPU module RUN/STOP key switch is set to the RUN position.
(1) Application of remote RUN/STOP
Remote RUN/STOP operation from remote location is useful in the following cases.
(a) When the CPU module is installed in an inaccessible location
(b) When setting the CPU module in a control panel to RUN/STOP from an external
source
(2) Operation for remote RUN/STOP
The following shows the program operations to which remote RUN/STOP is
performed.
(3) Method for performing remote RUN/STOP
The following two methods are available for performing remote RUN/STOP.
(a) Method using a remote RUN contact
The remote RUN contact is set in the PLC system in the parameter mode of
GPP function.
The settable device range is from input X0 to 1FFF.
Remote RUN/STOP can be performed by switching the remote RUN contact
ON/OFF.
1) When the remote RUN contact is OFF, the CPU module is in RUN state.
2) When the remote RUN contact is ON, the CPU module is in STOP state.
(a) Remote STOP......... The program is performed up to the END instruction, then
STOP state is established.
(b) Remote RUN........... When remote RUN is performed with the CPU in STOP set
by remote STOP, the program will be in RUN state again
and be performed from step 0.
Fig. 10.4 Time chart for RUN/STOP switching with remote RUN contact
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