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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

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Watlow LogicPro Bedienungsanleitung Seite 174