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4. CPU MODULE
4.3 Function List
Various functions of the CPU module 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
190ms in 10ms units.
• Write to the special register D9020
by the sequence program.
Latch (power failure
compensation)
Continuous control by data
retention on power failure
• When 20ms or longer power off, CPU reset or power off
occur, 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 batteries of the CPU main module.
• Latch devices and latch ranges are
specified by setting of the peripheral
device parameters.
Auto refresh of
MELSECNET/MINI-S3
Simplification of sequence
program
• Up to 8 A1SJ71PT32-S3 modules make I/O auto refresh
communication with batch refresh send/received data
area.
• Auto refresh is executed in a batch after END
processing.
• I/O devices allocated directly by each module can
program without FROM/TO instruction in the sequence
program.
• Performed by setting auto refresh
parameters of peripheral devices.
(Refer to Section 4.2.6.)
Remote RUN/STOP
When performing RUN/STOP
control from outside the
programmable controller
• When programmable controller CPU is in RUN (the
RUN/STOP 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 operation of
CPU while retaining the output
(Y)
•When performing RUN/
PAUSE control from outside
the programmable controller
• Stops the operation processing of programmable
controller CPU while retaining the ON/OFF of all the
outputs (Y).
• When programmable controller CPU is in RUN (the
RUN/STOP 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 devices
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
Check an operation and failure
factor on each device when
QCPU debugs or a failure
condition is met.
• The devices, for which status latch is set, are stored to
the extension file register of the status latch area in the
CPU main module when the status latch conditions are
met. (The stored data are cleared by the latch clear
operation.)
• 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.
• Using the peripheral devices, set
the device to which the status latch
is performed and the extension file
register where the data are stored.
• 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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