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LogicPro User’s Guide Chapter 10: Function Blocks

Doc.# 28002-00 Rev 3.00 Watlow Anafaze 165

N-- is an integer (INT) or long integer (LONG) specifying the

number of bits the shift should be done for per scan.

D-- is the INT or LONG integer Variable on which the shift is

to be performed (also an output).

Outputs

Q-- is the shift function’s output bit. The output bit is disabled

if the enable bit is False and is enabled as soon as the enable

bit is True.

D-- is the shift function’s output destination (as well as input).

The INT integer or LONG integer will be replaced with the

result of the shift operation.

Negation (NEG)

symbol1 = NEG

The NEG function block, shown in Figure 10.47, implements

a bitwise-NOT and complements the lowest bit (two’s

position).

symbol2 = W, L, WP, or LP

Variable A and B need to be declared as integer type, of size

specified in this symbol, as follows. Two memory sizes are

available for this integer, word-length W (16-bit) and long-

word L (32-bit). In addition, the function block’s calculation

can be performed continuously, or only as pulses, when the

enable bit (EN) switches value from False to True. In the

continuous computation case, integers are marked as W or L,

while in the Pulse computation case, they are marked as WP or

LP.

Figure 10.47 The Negation Function Block

Inputs

EN-- is the NEG function block’s enable bit: the conversion is

performed if it is True.

A-- is the integer (INT) or long integer (LONG) Variable to

have NEG performed on it.

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