Table of Contents
Advertisement
4
BASIC FUNCTIONS
This chapter shows the basic functions of C Controller modules.
4.1
Program Monitoring (WDT) Function
This function monitors and detects errors on hardware and a user program by using the watchdog timer (WDT), an internal
timer of a C Controller module.
Item
System watchdog timer
User watchdog timer
Monitoring time setting and reset
The following shows the setting and resetting method for the monitoring time for the watchdog timer.
System watchdog timer
Set a monitoring time for the system watchdog timer within the range of 20 to 2000 ms (in 10 ms units).
The system of a C Controller module resets the system watchdog timer while executing fixed cycle processing.
[CPU Parameter] [RAS Setting] [WDT (Watchdog Timer) Setting]
Window
Displayed items
Item
Monitoring time
User watchdog timer
Set a monitoring time for the user watchdog timer within the range of 100 ms to 10000 ms (in 10 ms units) by using the C
Controller module dedicated function (CCPU_StartWDT).
Monitoring starts by executing the C Controller module dedicated function (CCPU_StartWDT), and the monitoring time is
reset by executing the C Controller module dedicated function (CCPU_ResetWDT).
4 BASIC FUNCTIONS
32
4.1 Program Monitoring (WDT) Function
Description
A timer to monitor the system of a C Controller module.
Use this to detect an error in hardware and system software.
A timer to monitor a user program.
Use this to detect an error in a user program.
Description
Set the execution monitoring time to the system WDT.
Setting range
20 to 2000 ms (10 ms units)
Default
1000 ms
Advertisement
Table of Contents
