Rockwell Automation GMLC Reference Manual - Manual (Page 355)

Publication GMLC-5.2 - November 1999
318 I/O and Event Blocks
Only one of the two available virtual axes can be enabled at one time—
enabling one virtual axis automatically disables the other virtual axis if it
was previously enabled. Thus, to set up a registration event on an
AxisLink virtual axis, the virtual axis must first be enabled using a
previous Virtual Axis Control block.
Disarm Registration
The Watch Control block with disarm type and registration class selected
cancels a registration event set up by a previous Watch Control block with
Arm Registration selected that has yet to occur. If you selected Auto
Rearm Input in the original Watch Control block (with Arm type and
Registration class also selected), auto-registration also is disabled.
Enable Watch Position Event/Action
The Watch Control block, with Enable Event/Action type and Watch
Position class selected, sets up a watch position event and a specific
action that happens when the watch position event occurs. You can use
Watch Position events to synchronize an operation to a specific axis
position while the axis is moving, such as activating a solenoid to push a
carton off a conveyor at a certain axis position.
To specify the action that happens when the watch position event occurs,
one of the following blocks must be directly connected to the top (true)
node of the Watch Control block:
• Gear Axes
• Position Lock Cam
• Redefine Position
• Move Axis
Blocks connected to the top (true) node of the Watch Control block have
no output node since only a single action can happen when the watch
position event occurs.