Nematron Pointe Controller - Manual (Page 341)

Pointe Controller User Guide Appendix C: Ladder Diagram Block Reference
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Functional Description
When the input state from the left becomes on, the value of the associated Bit
tag is checked. If the tag is false or 0, then the output state to the right is turned
on. If the tag is true or 1, then the output state is kept off.
The relay is checked every time the ladder is scanned , so long as the input state
remains on.
Configuration Reference
Any Bit tag may be associated with the block: %IX, %MX, %QX, or T_DONE.
C.1.3 Rising Edge Relay (LEC)
When used in a Ladder Diagram, this block acts as a relay that controls the
passing of the rung state from the left to the right. The state is passed only when
the value of the associated Bit tag changes from 0 to 1.
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
When the value of the associated Bit tag transitions from 0 to 1, the input state
from the left is momentarily passed through the the output state to the right.
The state is passed only once, on the first scan immediately following the
transition. After that, the output state is turned off and kept off until the
associated Bit tag transitions again from 0 to 1.
Configuration Reference
Any Bit tag may be associated with the block: %IX, %MX, %QX, or T_DONE.
C.1.4 Falling Edge Relay (TEC)
When used in a Ladder Diagram, this block acts as a relay that controls the
passing of the rung state from the left to the right. The state is passed only when
the value of the associated Bit tag changes from 1 to 0.
Select the tool (from the Relays and Coils toolbar) and click on a ladder rung
to insert the following block: