# PLC typical instructions

**URL:** <https://forumautomation.com/t/plc-typical-instructions/2602>\
**Category:** PLC (Programmable Logic Controllers)\
**Tags:** plc\
**Created:** [November 7, 2017, 9:11pm UTC](https://forumautomation.com/t/plc-typical-instructions/2602 "2017-11-07T21:11:29Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sivaranjith](https://forumautomation.com/letter_avatar_proxy/v4/letter/s/ba9def/32.png) [@sivaranjith](https://forumautomation.com/u/sivaranjith)\
**Post date:** [November 7, 2017, 9:11pm UTC](https://forumautomation.com/t/plc-typical-instructions/2602/1 "2017-11-07T21:11:31Z")

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**XIC ( Examine ON):** Examine a bit for an ON condition.

**XIO (Examine OFF):** Examine a bit for OFF condition.

**OTE (Output energize):** Turn ON a bit ( non retentive)

**OTL (Output latch):** Latch a bit (retentive)

**OTU (output unlatch):** Unlatch a bit (retentive)

**TOFF ( timer off delay):** Turn an output ON/OFF after its rung has been OFF a preset time interval.

**TON (timer on delay):** Turn an output ON/OFF after its rung has been ON a preset time interval.

**CTD ( Count down ):** Use a software counter to count down from special value.

**CTU (Count up):** Use a software counter to count up to a specified value.