3 . I n s t r u c t i o n S e t
M N050 03003E F or mo re infor ma tio n vi sit:
w w w. e a t o n . c o m
3-47
API Mnemonic
Function
07
WDT
P Reset the Watchdog Timer
OP Range
Program
Steps
N/A
WDT, WDTP: 1 steps
ELC ELCB
ELCM
PB PC/PA/PH
PV
PB PH/PA
32 16
P
32 16
P
32 16
P 32 16 P 32 16
P
Description:
1.
The WDT instruction can be used to reset the Watch Dog Timer. If the ELC scan time (from
step 0 to END or FEND instruction) is more than 200ms, the ERROR LED will flash. The user
will have to turn the ELC OFF and then back ON to clear the fault. The ELC will determine the
status of RUN/STOP according to RUN/STOP switch when power is restored.
2.
When to use WDT:
a) When an error occurs in the ELC.
b) When the scan time of the program exceeds the WDT value in D1000. It can be modified by
using the following two methods.
i. Use WDT instruction (see the program example below for more information)
T1
T2
STEP0
END(FEND)
WDT
ii. Use D1000 (default is 200ms) to change the watchdog time.
Points to note:
1.
When the WDT instruction is used it will operate on every program scan so long as its input
conditions are true. To force the WDT instruction to operate for only ONE scan, use the suffix
P with the WDT instruction (WDTP).
2.
The watchdog timer has a default setting of 200ms for ELC controllers. This time limit may be
modified by moving another value into the contents of data register D1000, the wathdog timer
register.
Содержание ELC-PB
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