When Functional Safety is enabled, 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
enabled
SAFE Ensures safe meas‐
urement output at
the current output.
Operating signal
(4 to 20 mA)
Yes
Safety-related error ERROR The system has de‐
tected a safety-criti‐
cal error in "Func‐
tional Safety ena‐
bled"
device
mode.
The errors are lis‐
ted in the error list
of the device. Once
the errors have
been eliminated,
the device can only
be put back into
safe operation by
performing the
safety validation.
Failure signal
(≤ 3.6 mA or >
21.5 mA)
Yes
See also
Active device mode [28]
(Page 140)
Safety-related parameters (Page 165)
Enabling Functional Safety (Page 166)
10.1.5.1 Validation
In "Functional Safety disabled" device mode, you have the option of making the following
validations before you enable Functional Safety:
● Validation of safety-related parameters.
This validation ensures that all safety-related parameters are correctly transferred to the
device.
● Validation of the safety function (function test).
See also
Enabling Functional Safety (Page 166)
Functional Safety
10.1 Safety concept
SITRANS P320/P420 with 4 to 20 mA/HART
164 Operating Instructions, 11/2019, A5E44852162-AC
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