Rockwell-automation AutoMax Enhanced Ladder Language Reference Manual Uživatelský manuál stáhnout pdf (Strana 22)

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1.5 Using Transition Contacts

This section explains the methods for using transition contacts PTI and NTI and how

the transitions will be interpreted. The methods explained in this section are the

following:

D using a variable only on a transition contact

D using a variable on a coil and on a transition contact

D using a variable on more than one coil and on a transition contact

D forcing or setting variables used on transition contacts

D using a variable on a set (SCO) coil and reset coil (RCO) pair and on a transition

contact

D using transition contacts in a program with a Jump and Label construct

1.5.1 Using a Variable Only on a Transition Contact

When you use a variable only on transition contacts and not on any other coil within a

program, the transition contact behaves as follows:

D If the variable is local, setting or forcing the variable causes the transition contact to

always evaluate true. Therefore always use a coil for the local variable somewhere

else in the program.

D If the variable is global, another task determines whether a transition is detected by

the transition contact, since only another task can change the variable's value.

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