User`s manual

6
FUNCTIONS
6.11 Clock Function
6 - 45
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
(4) Changing and reading the clock data
(a) Changing the clock data
Clock data are changed with GX Developer.
Using [Online] [Set clock], GX Developer displays the clock setting window
where the CPU module clock data is changed.
POINT
When the CPU module clock data is changed using GX Developer, the CPU
module records OP210: "ADJUST SYSTEM CLOCK" in the operation/error
history.
(b) Reading Time Data
The special relay (SM213) and special registers (SD210-213) read clock data.
For details on the special relay, refer to Appendix 1; for details on the special
registers, refer to Appendix 2.
(5) Precautions
(a) Initial clock data setting
The clock data is not factory-set.
The clock data is used by the CPU module system for error
ยท operation history, etc.
When using the CPU module for the first time, be sure to set the precise time.
(b) Clock data when battery is low
The CPU measures the time even if the power fails module, using a battery
mounted on the CPU module.
Therefore, if the CPU module's battery capacity falls, the clock data value may
become inaccurate.
When the PLC power-on or the CPU module reset is canceled, the CPU module
checks if the clock data value is within the range shown in this Section (3).
If the clock data value is incorrect, the clock data value is initialized to January 1,
2005, 00:00:00.
At this time, the CPU module records OP004: "SYSTEM INITIALIZE SYSTEM
CLOCK" in the operation/error history.
(The time recorded in the operation/error history is the value of the clock data after
the clock data was initialized.)
Diagram 6.23 Clock data write from GX Developer