Industrial Automation, PLC, VFD, and Troubleshooting
In many PLC programs, the machine does not only turn devices ON and OFF randomly.
The machine often needs to follow a specific order.
For example:
Step 1: Start conveyor
Step 2: Detect product
Step …
Opening an unfamiliar PLC program can feel overwhelming.
You may see:
Dozens of routines
Hundreds or thousands of tags
Timers and counters everywhere
Interlocks
Permissives
Fault logic
HMI commands
VFD control
Analog signals
Communication logic
Old logic that nobody remembers
Comments that may …
Read MoreIn industrial automation, many machines operate in steps.
A door opens, stops, closes, and faults.A conveyor starts, runs, stops, and detects jams.A filler waits for a bottle, fills, verifies level, and …
Read MoreBuilding Professional and Industrial Ladder Logic with State Machines, Subroutines, and Status Codes
In a basic PLC program, it is common to organize the logic using a simple structure:
Input BufferingMode SelectionRequestsPermissivesInterlocksCommandsFault …
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