Function List - Mitsubishi A1SJH(S8) User Manual

4. CPU MODULE
4.3

Function List

Various functions of the CPU modules are explained below.
Function (application)
Constant scan
•Program execution at
constant intervals
•Simplified positioning
Latch (power failure
compensation)
Continuous control by data
retention on power failure
Remote RUN/STOP
When performing RUN/
STOP control from outside
the programmable controller
PAUSE
•When stopping the
operation of CPU while
retaining the output (Y)
•When performing RUN/
PAUSE control from
outside the programmable
controller
Status latch
Carries out operation check
and failure factor check on
each device when
debugging or a failure
condition is met.
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Description
• Makes the processing time for a single scan in the sequence
program constant.
• Set the processing time within the range of 10ms to 2000ms
by 10ms.
• When the power supply failure of 20ms or the longer/CPU
reset/power supply off occurs, data contents of the devices
for which latches have been set up in advance are retained.
• Latch-enabled devices: L, B, T, C, D, W
• Latched data are stored in the CPU main module and
backed up by the batteries of the CPU main module.
• When a programmable controller CPU is in RUN (the RUN/
STOP key switch is set to RUN), performs the
programmable controller's STOP/RUN from outside the
programmable controller (external input, peripheral devices,
computer) with a remote control.
• Stops the operation processing of a programmable controller
CPU while retaining the ON/OFF of all the outputs (Y).
When the operation is stopped by STOP,
all the outputs (Y) are set to OFF.
• When a programmable controller CPU is in RUN (the RUN/
STOP key switch is set to RUN), performs the
programmable controller's STOP/RUN from outside the
programmable controller CPU (external input, peripheral
devices, computer) with a remote control.
• With respect to the devices to which status latches are set
up, when the status latch conditions are met, the data
contents of the devices are stored in status latch area in the
CPU main module.
• The criteria for the satisfied condition can be selected from
when the SLT instruction is executed by the sequence
program or when the device value matches the set
condition.
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Overview of Setting and Operation
• Write to the special register D9020
by the sequence program.
• Latch device and latch range are
specified by setting of the
peripheral device parameters.
• When performed with the external
input (X), the parameter is set with
a peripheral device.
• When performed by a peripheral
device, perform in the
programmable controller test
operation.
• When performed via the computer
link module, perform using the
dedicated commands.
• Performed by the peripheral device
in the programmable controller test
operation.
• When performed with the external
input (X), perform the parameter
setting with the peripheral device,
set the special relay M9040 to ON
with the sequence program, then
perform.
• Set-up devices of status latch is
performed by parameter setting of
peripheral devices.
• Using the peripheral devices,
monitor the status latch data.