Switch Block - Desired Value Switcher
Full Name
Lib.Mervis.v1_0.SwitcherBlockValue
Required Project References
- Lib.Mervis
Description
A helper block used, in combination with a switch block, for switching the desired value.
Usage in ST
program test
var
switcherblock: lib.mervis.v1_1.SwitcherBlock;
switchervalue: lib.mervis.v1_0.SwitcherBlockValue;
end_var
switcherblock();
switchervalue(CompositeState := switcherblock.CompositeState);
end_program
Example Usage in FBD
Inputs
| Name | Data Type | Retain | Mandatory Connection | Meaning | |
| Demand | real | No | Yes | Desired value in automatic mode | |
| CompositeState | uint | No | Yes | Output CompositeState from the control switch block | |
| OffDemand | real | No | No | Demand value in the off state | |
| ManualDemand | real | Yes | No | Desired value when manually turned on |
Outputs
| Name | Data Type | Meaning |
| Command | real | Command |
Detailed Function Description
The block is used for selecting the control value when switching a device (e.g., a continuous demand for a frequency converter). If the device (or its switch block) is in automatic mode and has an operational demand, the Demand input value is copied to the Command output. In the case of manual activation, the ManualDemand value is copied to the Command output. In the off state (no demand or the device is manually turned off), the OffDemand value is copied to the Command output.