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4 FUNCTION LIST
4 FUNCTION LIST
The following table lists the functions of the CPU module.
Function Description Reference
Scan monitoring function
(Watchdog timer setting)
Detects an error in the hardware and program of the CPU module by
monitoring the scan time.
Page 44
Clock function This function is used for the time management in the function which
the system operates such as the date of the error history.
Page 46
Online change Changing ladder blocks
while online
Writes the part of a program edited on the ladder editor using the
engineering tool to the CPU module in units of ladder blocks. Edited
contents spanning multiple portions can be written to the CPU
module at once.
Page 50
Interrupt function Multiple interrupt function When an interrupt occurs while an interrupt program triggered by
another cause is running, stops the program if its priority is lower
than that of the new interrupt, and runs the higher-priority program
whenever its execution condition is satisfied.
Page 53
PID control function Performs PID control by the PID control instruction. Page 55
Constant scan Keeps the scan time constant and executes program repeatedly. Page 84
Remote operation Remote RUN/STOP Changes the CPU module status to the RUN/STOP/PAUSE status
externally while the RUN/STOP/RESET switch of the CPU module is
in RUN status.
Page 86
Remote PAUSE
Remote RESET Resets the CPU module externally while the CPU module is in the
STOP status.
Device/label memory area setting Sets the capacity of each area in the device/label memory. Page 92
Initial device value setting Sets the initial values of devices used in the program directly (not via
the program) to the devices.
Page 97
Latch function Holds the contents of the device and label of the CPU module when
the power is turned ON etc.
Page 99
Memory card function SD memory card forced
stop
Makes the SD memory card unavailable without turning OFF the
power even when the function accessing the SD memory card is
executed.
Page 103
Boot operation Transfers the file stored in the SD memory card to the transfer
destination memory judged automatically by the CPU module when
the power is turned ON or is reset.
Device/label access service processing setting Sets the number of execution times of the device/label access
service processing executed by END processing, with parameter.
Page 107
RAS function Self-diagnostics function Self-diagnoses the CPU module to see whether an error exist or not. Page 109
Error clear Batch-clears all the continuation errors being detected.
Security function Protects resources stored in PCs and resources in the units in the
system of the FX5 from illegal access by a third party such as theft,
alteration, accidental operation and unauthorized execution.
Page 113
GX Works3 Operating
Manual
Built-in
input/
output
function
High-speed counter function Performs high-speed counter, pulse width measurement, input
interruption, timer interruption, high-speed counter interruption, etc.
by using the input of the CPU module.
Page 114
Pulse width measurement function
Input interrupt function
Timer interrupt function
High-speed counter interrupt function
Built-in positioning function Executes positioning operation of up to 4 axes by using the
transistor output of the CPU module.
MELSEC iQ-F FX5 User's
Manual (Positioning
Control)
PWM output function Executes a PWM output by using the transistor output of the CPU
module.
Page 193
Built-in
analog
function
Analog input function Two analog inputs and one analog output are built in the FX5U CPU
module so that voltage input/voltage output can be performed.
Page 201
MELSEC iQ-F FX5 User's
Manual (Analog Control)
Analog output function
Built-in Ethernet function A function related to the Ethernet such as the connection with the
MELSOFT products and GOTs, and socket communication.
MELSEC iQ-F FX5 User's
Manual (Ethernet
Communication)
Serial communication function A function related to the serial communication such as N:N Network,
MC protocol, inverter communication function and non-protocol
communication.
MELSEC iQ-F FX5 User's
Manual (Serial
Communication)