Use In Safety Instrumented; Systems; Device Behavior During Operation; Device Behavior When Switched On - Endress+Hauser Proserve NMS80 Functional Safety Manual

Proserve NMS80
Endress+Hauser
5 Use in safety instrumented systems
5.1

Device behavior during operation

Digital
5.1.1

Device behavior when switched on

Once switched on, the device runs through a diagnostic phase of approx. 30 seconds. The
relay contact is open during this time. During the diagnostic phase, communication via the
service interface (CDI) or via protocols (HART, V1, Modbus, WM550) is not possible.
5.1.2

Device behavior when safety function is requested

The device displays a digital output value which corresponds to the limit value to be
monitored. The relay contact is closed within the range of validity, and is open outside this
range. This contact must be monitored and processed accordingly by a connected logic
unit.
5.1.3

Device behavior in the event of alarms and warnings

The relay contact is always open in the event of alarms and warnings. This contact must be
monitored and processed accordingly by a connected logic unit.
5.1.4

Alarm and warning messages

Additional information is provided by the alarm and warning messages in the form of
error codes and associated plain text messages.
The following table shows the correlation between the error code and the relay contact
output:
1)
Error code Relay contact (message type)
Fxxx Open
Mxxx corresponding to measuring mode
Cxxx corresponding to measuring mode
Sxxx corresponding to measuring mode
1) The error codes are listed in the Operating Instructions.
Analog
5.1.5 Device behavior when switched on
Once switched on, the device runs through a diagnostic phase of approx. 30 seconds. The
current output is set to failure current ≤3.6 mA during this time.
During the diagnostic phase, communication via the service interface (CDI) or via protocols
(HART, V1, Modbus, WM550) is not possible.
5.1.6 Device behavior when safety function is requested
The device outputs a current value corresponding to the limit value to be monitored. This
value must be monitored and processed further in a connected logic unit.
Use in safety instrumented systems
Note
xxx = three-digit number
xxx = three-digit number
xxx = three-digit number
xxx = three-digit number
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