User`s manual

6
FUNCTIONS
6.15 Watchdog Timer (WDT)
6 - 59
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) Precautions
(a) Watchdog timer error
An error of 0 to 10 ms occurs in the measurement time of the watchdog timer. Set
the watchdog timer for a desired value by taking such an error into account.
POINT
1. The scan time is the time taken for the execution of the sequence program,
starting from step 0 and ending at step 0.
The scan time is not the same for each scan, which differs according to the
execution or non-execution of the instructions used in the program.
2. To execute at the same scan time at every scan, use the constant scan
function. ( Section 6.9)