List three rules that pertain to most latch and unlatch instructions.

What will be an ideal response?


The following rules pertain to most latch and unlatch instructions.
1. Latch and unlatch instructions are typically used in pairs.
2. Latch and unlatch pairs of instructions must have the same reference address.
3. The latch and unlatch ladder rungs do not need to be grouped together in the ladder program.
4. Latching and unlatching instructions are retentive, provided your controller battery is installed and in good condition.
5. Use an unlatch instruction to unlatch, or clear, status bits.
6. If an unlatch instruction is left energized, the associated latching output cannot be latched.
7. Output latch instructions are retentive.

Computer Science & Information Technology

You might also like to view...

Which one of the following is NOT one of the three basic types of statement structures?

(A) sequence (B) loop (C) decision (D) input/output

Computer Science & Information Technology

In most cases, you will import the data stored in a single Excel worksheet, but you can also import named ranges of data. _________________________

Answer the following statement true (T) or false (F)

Computer Science & Information Technology

The small squares and circles around a selected graphic, as shown in the accompanying figure, are called ____ handles.

A. sizing B. shape C. base D. dimension

Computer Science & Information Technology

A text box is represented by a(n) ____ object.

A. Element B. Input C. Box D. Text

Computer Science & Information Technology