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4. CPU MODULE
4.3 Function List
Various functions of the CPU modules are explained below.
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Function (application) Description Overview of Setting and Operation
Constant scan
•Program execution at
constant intervals
•Simplified positioning
• 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.
• Write to the special register D9020
by the sequence program.
Latch (power failure
compensation)
Continuous control by data
retention on power failure
• 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.
• Latch device and latch range are
specified by setting of the
peripheral device parameters.
Remote RUN/STOP
When performing RUN/
STOP control from outside
the programmable controller
• 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.
• 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.
PAUSE
•When stopping the
operation of CPU while
retaining the output (Y)
•When performing RUN/
PAUSE control from
outside the programmable
controller
• Stops the operation processing of a programmable controller
CPU while retaining the ON/OFF of all the outputs (Y).
• 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.
• 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.
Status latch
Carries out operation check
and failure factor check on
each device when
debugging or a failure
condition is met.
• 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.
• Set-up devices of status latch is
performed by parameter setting of
peripheral devices.
• Using the peripheral devices,
monitor the status latch data.
When the operation is stopped by STOP,
all the outputs (Y) are set to OFF.
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