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.
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