# Bistable Relay - 40

Bistable Relay is a signal controlled by the inputs "Set Bistable Relay" and "Reset Bistable Relay".
After receiving the input "Set Bistable Relay", Bistable Relay signal is set to True.
After receiving the input "Reset Bistable Relay", Bistable Relay signal is set to False.

If "Set Bistable Relay" or "Reset Bistable Relay" goes low, the Bistable relay keeps its state.
The state for the Bistable relay changes when "Set Bistable Relay" or "Reset Bistable Relay" goes high.

After restarting the controller, the Bistable relay is set to False as default.

Name in SoftPLC: BISTABLE_RELAY

Converter | Signal Type | Value Type | Size Min [bit] | Size Max [bit]
--- | --- | --- | --- | ---
Standard | State | Boolean | 1 | 1
Invert | State | Boolean | 1 | 1

To avoid duplicating signals, it is possible to define Value Converters.

Converters are used to support more than one representation of the same signal (for example Angle/Torque Status can both be represented bitwise or as a status character).

## Devices

- Fieldbus: TRUE

- Indicator Box: TRUE

- Internal I/O: TRUE

- Operator Panel: TRUE

- Tool Functions: TRUE

- ST Selector: FALSE

- Stacklight: TRUE

- TLS Tag: TRUE

- I/O Expander: TRUE