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When Functional Safety is enabled, the following device modes are displayed via the display
or remote operation:
Device mode
Description
Current output value
Safe current output
Functional Safety ena‐
bled
Ensures safe measure‐
ment output at the cur‐
rent output.
Operating signal
(4 to 20 mA)
Yes
Safety-related error
The system has detec‐
ted a safety-critical error
in "Functional Safety en‐
abled" device mode.
The errors are listed in
the error list of the de‐
vice. Once the errors
have been eliminated,
the device can only be
put back into safe oper‐
ation by performing the
safety validation.
Failure signal
(≤ 3.6 mA or ≥ 21 mA)
Yes
You can find the display of the device modes in the section Active device mode [28]
See also
Safety-related parameters (Page 159)
Enabling Functional Safety (Page 160)
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 160)
Functional Safety
10.1 Safety concept
SITRANS P320/P420 (mA/HART)
158
Operating Instructions, 06/2018, A5E44852162-AA