Nematron Pointe Controller - Manual (Page 418)

Appendix C: Ladder Diagram Block Reference Pointe Controller User Guide
416
C.7.7 Compare strings (CMP)
When used in a Ladder Diagram, the CMP block compares two strings (variable or
literal) and send the result to an output.
Select the tool (from the String Blocks 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 Enable input state (EN) through to the Enable Out
output state (ENO) without change; when EN becomes on, ENO is turned on, and
when EN becomes off, ENO is turned off.
When EN becomes on, the block function is executed: the Input Strings 1 and 2
(IN1 and IN2) are compared and the result is placed in the Output Value (OUT).
Values for OUT are determined as follows:
When… OUT is…
IN1 < IN2 -1
IN1 = IN2 0
IN1 > IN2 1
When two strings are identical up to the NULL terminator in the shorter string
(‘ain1’ and ‘ain100’ for example) the shorter string is considered less than the
longer.
The block function is executed every time the ladder is scanned , so long as EN
remains on. If EN becomes off, then OUT remains at its last calculated value until
EN becomes on and the block function is executed again.