Alarm

What you will find in this section:

  1. Alarm
  2. Related topics

 

The digital output complies with IEC 61131-2 Type 3. It can be configured via the web server or the Modbus communication interface. 

Alarm

 

If limit value alarms are present (see chapter: Alarming) and the function of the digital output is set to Alarm, the digital output can reflect these alarms.

 

Navigation on the web server

Menu: “Settings, Digital output”, “Alarm” function

 

Menu: “Settings, Digital output”, “Alarm” function
Menu: “Settings, Digital output”, “Alarm” function

 

Status

The “Status” area shows the current status of the digital output.

Identifier

The identifier can be used to assign a user-specific designation to the digital output.

Idle level

There are two possible statuses for the idle level.

  • NC: Normally closed
  • NO: Normally open

Function

Select the “Alarm” function.

The integrated logic gate makes it possible to define several alarm messages for the alarm function of the digital output. The digital output can be used for this type of multiple assignment, depending on up to four alarms/thresholds.

Alarm 1…4:

Select the alarms that are to be linked to the logic gate. You can use the checkbox to invert the signal.

Logic gate

An operator has to be defined for the function of the logic gate.

Select a logic operator from the drop-down menu:

  • AND
  • OR
  • XOR
  • NAND
  • NOR
  • NXOR

The alarms themselves are configured via “Settings, Alarms”.

Function description of the logic gate

The logic gate links configured statuses of the respective alarms with an assigned logic function. Various application-specific statuses can be monitored, depending on how the connections are combined.

Below, you can find explanations on how the logic operators work:

 

AND operator

Logic gate with AND operator
Logic gate with AND operator

 

When all alarms are active at the same time, this signal output is set.

If one of the alarms is no longer active, this signal output is reset. 

 

NAND operator

Logic gate with NAND operator
Logic gate with NAND operator

 

When none of the alarms are active, this signal output is set. 

If one of the alarms is active, this signal output is reset. 

 

OR operator

Logic gate with OR operator
Logic gate with OR operator

 

When one of the alarms is active, the signal output is set.

If none of the alarms are active, this signal output is reset.

 

NOR operator

Logic gate with NOR operator
Logic gate with NOR operator

 

When none of the alarms are active, this signal output is set.

If one of the alarms is active, this signal output is reset. 

 

XOR operator

Logic gate with XOR operator
Logic gate with XOR operator

 

If an alarm is active, this signal output is set.

If none or several of the alarms are active, this signal output is reset.

 

NXOR operator

Logic gate with NXOR operator
Logic gate with NXOR operator

 

If none or several of the alarms are active, this signal output is set.

If only one of the alarms is active, this signal output is reset.

  1. Digital output
  2. Impulse
  3. Manually
  4. Deactivating the digital output
  5. Rotary field direction
  6. Device status

 

EMpro online documentation
Published/reviewed: 2026-07-10, en revision 004, Version history