Yaskawa MotionWorks IEC Toolboxes - Manual (Page 531)

Yaskawa Toolbox: Function Blocks
MotionWorks IEC61131-3 Toolboxes: 2013-09-13 518
CommWatchDog
This function block allows the application program to monitor data being transmitted from a master device. If
the data does not change within the TimeOut period, then the OK output goes off to indicate that the
communications is not being updated by the master.
Parameters
* Parameter Data
Type Description
VAR_INPUT Default
B Enable BOOL
The function will continue to execute while enable is held
high.
FALSE
V HeartBeat DINT
Value that the master changes and sends to the
MP2000iec controller.
DINT#0
V WatchDog DINT
The HeartBeat input must change value within the
TimeOut period for the communications to be considered
OK.
DINT#0
VAR_OUTPUT
B Valid BOOL Indicates that the outputs of the function are valid.
V OK BOOL
Indicates if the HeartBeat input has changed within the TimeOut
period.
Error Description
The Valid Output will be high when the function is executing. If the WatchDog value is not greater than zero,
the function will not operate.