Boolean constant
constant: holds one value forever
History the device's own ring buffer, 15 min deep
1 1
Now
True
Good 15:24:55

Runtime only — not written to the configuration. Release undoes it.
Behaviour constant
This kind takes no parameters.
Where a client reads it
opcua
opc.tcp://localhost:48012
ns=2;s=Gallery.BoolConstant
read-only here
modbus
modbus://localhost:5022?unitId=2
coil 10
read-only here
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