PLC glossary
Deadband
A gap between the point where an alarm comes on and the point where it goes off. It stops a rippling reading from flashing the alarm.
- Also called
- alarm deadband, alarm hysteresis
- On site
- A high-level alarm comes on at 85 percent and clears only below 80 percent.
- Siemens
- WinCC analogue alarms can add hysteresis; you can also write it in the programme.
- Rockwell
- The ALMA instruction and FactoryTalk alarms have a deadband setting.