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Storing Alarm: A1MD = LTCH
With the setting LTCH, the alarm is activated depending on the alarm value A1SP
and the hysteresis A1HY switched on and by the event input EIFN or the switching
off of the operating voltage reset.
The setting of the EIFN must RS.A1, RS.A2 or R.A1.2.
Example:
Storing alarm
Alarm held: A1MD = HOLD
With the setting HOLD, the alarm is activated depending on the alarm value A1SP
and the hysteresis A1HY switched (like setting NORM), however, the function only
becomes active when the control setpoint has been reached. This helps to avoid
unnecessary alarms when starting a process.
Example:
Alarm held
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