User`s manual
6
FUNCTIONS
6.1 Function List
6 - 1
1
Overview
2
Performance
Specification
3
Sequence Program
Configuration and
Execution Conditions
4
I/O Nunber Assignment
5
Memories and Files
Handled by CPU Module
6
Functions
7
Communication with
Intelligent Function
Module
8
Parameters
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
This function 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.
Section 6.2
CPU access password
This function prevents incorrect operations from GX
Developer connected by mistake.
Section 6.3
PLC memory initialization
This function erases user data written to the CPU
module. When the PLC memory is initialized, data is
returned to its factory settings status.
Section 6.4
Setting for preventing continuous RUN
in TEST MODE
This function prevents the PLC system from running
continuously for long periods in TEST MODE.
Section 6.5
ROM write count check This function checks the number of writing to ROM. Section 6.6
Self-Diagnosis function
This function enables the CPU module to check for
failures.
Section 6.7
Operation/error history
This function recordsthe 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.
Section 6.8
Constant scan
This function executes the program at a constant
frequency.
Section 6.9
Output status selection function for
transition from STOP status to RUN
status
This function 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.
Section
6.10
Clock function This function executes the CPU module internal clock.
Section
6.11
Remote RUN/STOP
This function stops and starts operating the CPU
module.
Section
6.12.1
Remote RESET
This function resets the CPU module when the CPU
module is in a STOP status.
Section
6.12.2
Monitoring function
This function monitors the status of programs and
devices on the CPU module by operating from the GX
Developer.
Section
6.13
Online change
This function writes programs when the CPU module is
in the RUN status.
Section
6.14
Watchdog timer
This function monitors operational delays caused by
CPU module's hardware and program errors.
Section
6.15
System display
This function connects to the GX Developer and
monitors system configuration.
Section
6.16
LED display
This function enables the front-mounted LEDs to
indicate the operating conditions of the CPU module.
Section
6.17