6
FUNCTIONS
6.1 Function List
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CHAPTER6 FUNCTIONS
Function of CPU module is as follows:
6.1 Function List
Functions of CPU module are listed in Table6.1.
The Nos. in the "CPU module" field correspond to the CPU modules as indicated below.
: Available : N/A
Table6.1 CPU module function list
Item
Description
Safety CPU operation
mode
Reference
SAFETY
MODE
TEST
MODE
Safety CPU operation mode
Selects whether to normally operate the CPU module as
part of the safety device or to carry out maintenance on
the CPU module using program changes and device
test functions.
CPU access password
Prevents incorrect operations from GX Developer
connected by mistake.
PLC memory initialization
Erases user data written to the CPU module. When the
PLC memory is initialized, data is returned to its factory
settings status.
Setting for preventing continuous RUN
in TEST MODE
Prevents the PLC system from running continuously for
long periods in TEST MODE.
ROM write count check
Checks the number of writing to ROM.
Self-Diagnosis function
Enables the CPU module to check for failures.
Operation/error history
Records the the operations that have been executed to
the CPU module from the outside and the self-
diagnostics errors that have occurred in the CPU
module in the past.
Constant scan
Executes the program at a constant frequency.
Output status selection function for
transition from STOP status to RUN
status
Selects the output Y status (output before STOP/output
after the calculation execution) when the CPU module is
set from STOP status to RUN status.
Clock function
Executes the CPU module internal clock.
Remote RUN/STOP
Stops and starts operating the CPU module.
Remote RESET
Resets the CPU module when the CPU module is in a
STOP status.
Monitoring function
Monitors the status of programs and devices on the
CPU module by operating from the GX Developer.
Online change
Writes programs when the CPU module is in the RUN
status.
Watchdog timer
Monitors operational delays caused by CPU module's
hardware and program errors.
Remote password
Prevents an illegal access using the Ethernet module.
System display
Connects to the GX Developer and monitors system
configuration.
LED display
Enables the front-mounted LEDs to indicate the
operating conditions of the CPU module.
Summary of Contents for MELSEC QS Series
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