6
FUNCTIONS
6.16 Watchdog Timer (WDT)
6 - 127
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 using
built-in Ethernet ports of
CPU module
8
Communication with
Intelligent Function
Module
(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.
(b) Watchdog timer reset when program is executed repeatedly by FOR and
NEXT instructions
The watchdog timer can also be reset by executing the WDT instruction in a
sequence program.
If the watchdog timer expires while the FOR and NEXT instructions are
repetitiously executed, reset the watchdog time with the WDT instruction.
Figure 6.83 Watchdog timer reset when FOR and NEXT instructions are executed
FOR K1000
WDT
NEXT
Program for repetition processing
WDT reset
Repetition
(1000 times)
M0
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