Instruction Manual

Pointe Controller User Guide Appendix C: Ladder Diagram Block Reference
395
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: a bit-for-bit logical
inversion is made upon the Input Values (IN) and the result is placed in the
Output Value (OUT).
Each bit in IN is evaluated according to the following table:
IN 01
OUT 10
Therefore, a 16-bit example of NOT would be:
IN1: 1010010101011101
OUT: 0101101010100010
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.
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 any integer*
T_DONE
T_VALUE
T_PREVAL
The input value.
OUT Output
Value
req any integer* The result of a bit-for-bit NOT
inversion upon the input value.
* Any Input, Output, or Memory tag except 32-bit Real (F). For more information, see “Defining Input,
Output, Memory tags” on page 114.
NOTE: If the function result is larger than the output variable (for example, a 16-
bit result to be placed in an 8-bit output variable), then the high-order bits of the
result are discarded and the low-order bits are placed in the output.
Also, this function does not negate or invert the sign of a signed variable. To
invert the sign of a signed variable, configure an XOR function with the variable
to be inverted as the first input value and –1 as the second input variable.