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Chapter 10: Function Blocks LogicPro User’s Guide

162 Watlow Anafaze Doc.# 28002-00 Rev 3.00

InterLock (IL)

InterLock and InterLock-Clear function blocks, shown in

Figure 10.43 and Figure 10.44 are designed to act as opening

(IL) and closing (ILC) brackets to a segment of logic. The

section(s) of a ladder program positioned between IL and ILC

rungs can be selectively executed. IL and ILC cannot be nested.

IL and ILC alter the performance of all elements contained in

the “bracket” (all rungs between the IL and the ILC markers) as

dictated by the result of the logic to the left of the IL block.

Therefore, if the EN bit of the IL block is False, there is no

execution of the bracketed logic; however, if the EN bit of the

IL block is True, the bracketed logic executes. The IL/ILC

bracket is local to one Ladder, and so does not affect others

which may be running simultaneously in a “parent” SFC.

symbol1=IL

The InterLock function block marks the beginning of a group

of Ladder logic diagram operations that are “bracketed” for

special purpose.

Figure 10.43 The InterLock Function Block

Input

EN-- is the InterLock enable bit. A True condition of this bit

activates the IL/ILC bracket and causes the special effects listed

in the previous section.

Output

Q-- is the InterLock output bit. This bit reflects the state of the

enable bit (EN). It does not affect the rest of the program.

InterLock-Clear (ILC)

symbol1=ILC

The ILC function block simply marks the end of the Ladder

logic segment that is affected by the Interlock function.

Figure 10.44 The InterLock Clear Function

Block

1 2 ... 173 174 175 176 177 178 179 180 181 182 183 ... 295 296

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