26
Configuration of the diagnostic output
dOU1
Response of the analogue output in case of a fault
2 settings can be selected:
• FOU2 = ON: The analogue signal goes to the value (21.1 mA).
• FOU2 = OFF: The analogue signal goes to the value (3.5 mA).
FOU2
drEd
Normally Closed (DESINA characteristics, wire-break can be
detected)
Nominal operation:
Diagnostic output active
1)
Fault warning:
Diagnostic output active
1)
Fault alarm:
Diagnostic output inactive
nc
1)
pnp or npn, depending on the setting of the parameter P-n
2)
depending on the setting of the parameter FOU2
Normally Closed extended (wire-break can be detected)
Nominal operation: Diagnostic output active
1)
Fault warning:
Diagnostic output provides 2-Hz signal
1)
Fault alarm:
Diagnostic output inactive
nc+
Normally Open extended
Nominal operation: Diagnostic output inactive
Fault warning:
Diagnostic output provides 2-Hz signal
1)
Fault alarm:
Diagnostic output active
1)
no+
HB: Heartbeat (wire-break and short circuit on the wire of
the diagnostic output can be detected)
Nominal operation: Diagnostic output provides 4-Hz signal
1)
Fault warning:
Diagnostic output provides 2-Hz signal
1)
Fault alarm:
Diagnostic output inactive*
Hb
Characteristics of the redundancy switching (backup)
Fault in the electronics:
Analogue signal at fault value
2)
Both sensor elements defective: Analogue signal at fault value
2)
One sensor element defective: Analogue signal at fault value
2)
Both drift thresholds (alarm / warning) exceeded:
Analogue signal corresponds to measured temperature.
OFF
Fault in the electronics:
Analogue signal at fault value
2)
Both sensor elements defective: Analogue signal at fault value
2)
One sensor element defective: Analogue signal corresponds to
the temperature of the 2
nd
measuring element (backup).
Both drift thresholds (alarm / warning) exceeded:
Analogue signal corresponds to measured temperature.
On
