Nematron Pointe Controller - Manual (Page 344)

Appendix C: Ladder Diagram Block Reference Pointe Controller User Guide
342
When the input state from the left becomes on, the associated Bit tag is set to 1.
The tag is maintained, or “latched, at 1 until it is explicitly reset to 0 by an
external action (either an I/O change or another PointeControl block). The tag is
not changed when the input state becomes off.
The coil is checked every time the ladder is scanned , so long as the input state
remains on. However, the associated Bit tag cannot be set (latched) unless it is
already 0.
Configuration Reference
Any Memory Bit (%MX) or Output Bit (%QX) tag may be associated with the
block.
C.1.8 Unlatched Coil (UOC)
When used in a Ladder Diagram, this block acts as a coil that sets an associated Bit
tag to 0 and maintains it until it is explicitly reset to 1 by an external action.
Select the tool (from the Relays and Coils toolbar) and click on a ladder rung
to insert the following block:
Once the block is inserted, you can double-click on it to configure it.
Functional Description
This block always passes the input state through to the output state without
change; when the input state becomes on, the output state is turned on, and
when the input state becomes off, the output state is turned off.
When the input state from the left becomes off, the associated Bit tag is set to 0.
The tag is maintained, or “unlatched, at 0 until it is explicitly reset to 1 by an
external action (either an I/O change or another PointeControl block). The tag is
not changed when the input state becomes on.
The coil is checked every time the ladder is scanned , so long as the input state
remains off. However, the associated Bit tag cannot be set (unlatched) unless it is
already 1.
Configuration Reference
Any Memory Bit (%MX) or Output Bit (%QX) tag may be associated with the
block.