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LogicPro User’s Guide Chapter 8: Ladder Diagrams

Doc.# 28002-00 Rev 3.00 Watlow Anafaze 91

Figure 8.7 Ladder Diagram Before Elements

Are Added to Function Block

Figure 8.8 Ladder Diagram After Elements

Are Added to Function Block

Function Blocks with More Than One Input and Output Bit

Some Function Blocks have more than one input and output

logical bit. For example, the CTUD (Counter Up Down)

Function Block has four logic input bits (CU, CD, R, LD) and

two logical bits (QU and QD) on the output side, as shown in

Figure 8.9 on page 92.

To insert a new element between the left power rail and the

second or lower logical input:

1. Select the element type from the toolbar.

2. Click and hold on the right side of the left power rail

directly across from the logical input of the Function

Block. Handles appear on the left power rail to indicate

that you have selected the correct part of the rail.

3. Drag the line to the connecting point on the Function

Block.

4. Release the mouse button. A rung appears with the

element on it, as shown in Figure 8.10 on page 92.

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