Watlow LogicPro - Manual (Page 174)

Chapter 10: Function Blocks LogicPro User’s Guide
158 Watlow Anafaze Doc.# 28002-00 Rev 3.00
Vendor Provided Function Blocks
This section provides information and examples of vendor
provided function blocks.
In this section, the terms symbol 1, symbol 2, and symbol
3 are used. These terms refer to the labels shown within each
of the function blocks as shown in Figure 10.39.
Figure 10.39 Vendor Provided Function Block
diagram
Vendor provided comparison and calculation functions offer
an alternate format and other options not found in standard
function blocks.
Comparison (CMP)
symbol1 = CMP
The comparison function block (CMP) is designed to test
quantitative relationships between two specified inputs, A and
B, and report the finding in the output bit (Q). See Figure
10.40 on page 159.
symbol2 = W or L
The Variables A and B need to be declared as INT type or
LONG integer type, of size specified in this symbol. Two
memory sizes are available for these integers, word-length W
(16-bit) and long-word L (32-bit). Pulse-types are not
available.
symbol3 = comparison
In the CMP function block, this symbol specifies the type of
comparison to be made and takes on one value from the set of
{ = (equal), <> (not equal), > (greater than), >= (greater or
equal), < (less than), <= (less than or equal)}. For example, the
function block would compute the comparison
A <= B
and enable the output bit Q, if B is greater or equal to A, and
disable Q if B is less than A. Similarly, the comparison A<>B
would enable Q if A does not equal B, while disable Q if A did
equal B.
Symbol 1
Symbol 2
Symbol 3