10.1.4 Operating modes of the device
The device can be operated as follows:
● "Functional Safety disabled" is used for operation in non-safety-related applications.
●
"Functional Safety enabled" is used for operation in safety-related applications.
See also
Enabling Functional Safety (Page 166)
10.1.5 Device mode
When Functional Safety is disabled, the following device modes are displayed via the display
or remote operation:
Device mode Display Description Current output val‐
ue
Safe current output
Functional Safety
disabled
STD Used for operation
in non-safety-rela‐
ted applications.
The safety-related
parameters of the
device are set.
Operating signal
(4 to 20 mA)
No
FUNCT The safety-relevant
parameters and
the
safety function are
validated.
Out of service, non-
safe mode
O/S The device is out of
service (e.g. a firm‐
ware update is run‐
ning)
Failure signal
(≤ 3.6 mA or >
21.5 mA)
No
Functional Safety
10.1 Safety concept
SITRANS P320/P420 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E44852162-AC 163
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