Rockwell Automation GMLC Reference Manual - Manual (Page 361)

Publication GMLC-5.2 - November 1999
324 I/O and Event Blocks
If other tasks are executing (multitasking), the task which contains this
block pauses but the other tasks continue to execute. In this way, a Wait
for Registration selection in one task does not pause execution of any
other tasks or hang the task dispatcher.
If Registration
The If Registration type evaluates a previously configured registration
event for the selected axis, without pausing the program. An On Watch
block with If Registration selected executes only if a registration event
has previously been set up for the selected axis with an Arm Registration
block.
When the program executes, program flow branches to the top (true) node
if the event has occurred, and to the bottom (false) node if the event has
not occurred.
When multiple tasks are executing (multitasking), you can use an If
Registration type in one task to evaluate a registration event set up in
another task, even if Wait for Tripped is selected in the Watch Control
block. See Watch Control for more information on registration events.
Set Timer
Use the Set Timer block to:
•
Set one of four count down timers to the desired time setting.
• Set the value of the free running clock.
The Set Timer block resides on the Main Palette.
Set Count Down Timer
The count down timer counts downward from the set time to zero. Use the
count down timer to implement dwells and other time-related events in
the diagram.
Wait for Timeout
Selecting one of the countdown timers displays the Wait For Timeout
field.