Nematron Pointe Controller - Manual (Page 376)

Appendix C: Ladder Diagram Block Reference Pointe Controller User Guide
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Configuration Reference
The parameters of this block are described in the following table:
Param Name Config Var Type Description
EN Enable no - The state of the rung (off/on)
received from the left.
ENO Enable
Out no - The state of the rung (off/on)
passed to the right.
IN Input
Value req signed only*
T_DONE
T_VALUE
T_PREVAL
Numeric
The input value.
OUT Output
Value req signed only* The result of calculating the
absolute value of the input value.
* Any Input, Output, or Memory tag labeled as “signed. For more information, see “ Defining Input,
Output, Memory tags ” on page 114 .
C.3.14 Logarithm (LOG)
When used in a Ladder Diagram, the LOG block finds the base-10 logarithm of an
input and sends the result to output.
Select the tool (from the Math 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 logarithm of the Input
Value (IN) is calculated and the result is placed in the Output Value (OUT).
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.