CASE Logic in Structured Text PLC Running, Block

Описание: In this video, we learn how to use CASE logic in Structured Text inside Studio 5000.

Instead of writing multiple IF statements, we use CASE to control real PLC board outputs based on machine status.

We use an industrial example with the following states:

0 = STOPPED
1 = RUNNING
2 = BLOCKED
3 = STARVED

Green light indicates Running
Red light indicates Stopped
Yellow light indicates Blocked
Blue light indicates Starved

You will learn:

• How CASE works in Structured Text
• Why outputs can stay ON unexpectedly
• The clear-first pattern for safe state control
• How to debug output retention issues
• How to structure state-based logic cleanly

Practice questions are included at the end of the video.

This is part of the Structured Text playlist where we build real industrial automation logic step by step.

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Timeline
00:00 What You’ll Learn
00:40 Why CASE Instead of IF
02:00 Define Machine Status States
03:10 CASE Without Clearing Outputs
05:30 Why Lights Stay ON (Debug Moment)
06:45 Clear-First Pattern (Correct Version)
08:40 Live PLC Board Demo
09:45 Common Mistakes
10:40 Practice Problems
11:45 Wrap-Up

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