Alarm Trigger for Real Variables (v1.1)
Full Name
Lib.Mervis.v1_1.real_to_alrtrig
Required Project References
- Lib.Mervis
Description
Auxiliary block used for generating an alarm from a real variable.
Usage in ST
program test
var
alrTrig: lib.mervis.v1_1.real_to_alrtrig;
end_var
alrTrig();
end_program
Inputs
| Name | Data Type | Retain | Required to Connect | Meaning | |
| Input | bool | No | Yes | Input value | |
| Priority | AlarmPriorityType | No | No | Alarm class | |
| LowLimit | real | No | No | Lower allowable value | |
| HighLimit | real | No | No | Upper allowable value | |
| Hysteresis | real | No | No | Hysteresis around limit values | |
| Delay | time | No | No | Alarm delay | |
| TriggerType | RealAlarmTriggerType | No | No | Type of monitored event |
Outputs
| Name | Data Type | Meaning | |
| Alarm | AlarmTrigger | Output |
Detailed Function Description
The block generates an alarm if the Input is outside the defined range. The alarm is activated when the condition specified by the TriggerType parameter is met.
| Condition | Condition for Activation | Condition for Deactivation |
| LowAndHigh | Input < LowLimit or Input > HighLimit | Input > LowLimit + Hysteresis and Input < HighLimit - Hysteresis |
| Low | Input < LowLimit | Input > LowLimit + Hysteresis |
| High | Input > HighLimit | Input < HighLimit - Hysteresis |
If a delay is set, the condition for activation must be met for at least this defined period.