3 years ago

Ladder Logic Programming Basics - XIC & XIO Instructions in RSLogix 5000
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The XIC, also known as Examine If Closed, instruction is one of the fundamental instructions used in ladder logic programming for Programmable Logic Controllers (PLCs). This instruction is always found on the left side of a ladder rung and will verify if the specified bit is in a logic Active state (Meaning a value of 1). If that’s the case, the instruction will evaluate to true and allow the rest of the rung to execute.

The XIO, also known as Examine If Open, instruction performs the function opposite to the XIC (Examine if Closed). It’s a fundamental instruction for working with Programmable Logic Controllers (PLCs). This instruction can be found on the left side of a ladder logic rung and will evaluate to true if the specified bit is set to a Not Active state (Meaning a value of 0). If that’s the case, the instruction will allow the rest of the rung to execute.

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0:00 XIC and XIO Intro
0:20 The hardware
1:20 What an XIC instruction does
2:15 How an XIC instruction works
2:50 XIC instruction recap
3:45 Example of a seal-in Circuit
5:00 Using XIC instructions
5:55 How an XIO instruction works
6:15 Pressing both buttons to show the XIC & XIO instructions in use
6:25 XIC instruction opposite to an XIO instruction
6:45 Quick recap