Industrial Engineer · phase 3 of 16
Force
Temporary override that commands an I/O point or tag to a selected state for testing and troubleshooting.
The Explain card
- Plain English
- A force overrides an I/O point to a value you choose, whatever the field wiring or the logic says. It is a troubleshooting tool that lives outside the program.
- Example
- A sensor is broken and the part is on order. A technician forces the input on so the line can run, and tapes a note to the panel.
- Why it matters
- Forces are invisible in the code, so a forced input makes logic look right while the machine runs blind. A force left on after the repair is how a press runs with its guard bypassed. Most controllers flash a light when any force is active, and that light means find it.
- Hook
- Useful for an hour, dangerous for a week.
Where it sits in the deck
Phase 3: PLC Program Organization and Execution
How the logic is arranged and how the scan actually runs it, which is the difference between code that works and code that works every time.
