Inovance H3U Series - Watchdog Timer Reset

69
4
4 Instructions 4.1.6 Other Processing Instructions
WDT: Watchdog timer reset
◆
Overview
The WDT instruction resets the watchdog timer.
WDT
Watchdog timer
reset
Applicable model:
H3U
An independent instruction without operands
16-bit instruction (1
step)
WDT: Continuous
execution
WDTP: Pulse
execution
◆
Function
The PLC has a timer used to monitor the duration of a user program execution. If the execution times out,
it is stopped and an alarm is generated. Use the WDT instruction to reset the watchdog timer, allowing it to
start timing again and avoiding the timeout error.
X2
(WDT)
A running timeout error may occur when a user program executes a complex operation (for
example, an operation with many loop computations). To avoid this error, use the WDT instruction (for
example, insert it between the FOR and NEXT instructions) when necessary during the programming
process.
If the program scan duration exceeds the value in D8000 (default: 200 ms), insert the WDT instruction into
the program to divide it into segments, each with a scan duration less than 200 ms, or change the value in
D8000.
Example:
The scan duration of the program is 320 ms. Use the WDT instruction to divide the program into two
segments, each with a scan duration less than 200 ms.