PLC glossary
Wire break
A cut or loose cable that stops a sensor's signal reaching the PLC. A 4–20 mA input then reads close to 0 mA.
- Also called
- broken wire, open circuit
- On site
- A damaged transmitter cable makes the level reading drop far below empty.
- Siemens
- S7-1500 analogue cards can report it as a diagnostic, with the value 32767.
- Rockwell
- Logix analogue modules flag it with channel fault status bits.