7.4 Locking the device
The following options are available to lock the device:
●
Enabling
write protection using the jumper. (Page 82)
● Enabling write protection using the user PIN. (Page 138)
● Enabling write protection using the button lock. (Page 134)
Write protection Sym‐
bol
ID Read measured values on
the display
Read parameters on the
display
Change parameters
via
the
device with dis‐
play
Jumper set
L Yes No No
User PIN
1)
enabled LP Yes Yes Yes, after input of the
user PIN
Button lock enabled LL Yes No No
1)
The user PIN is factory set to 2457 in the device. When delivered, write protection is disabled
using the user PIN.
Devices with functional safety
To enable functional safety, you first enable the user PIN.
7.4.1 Enable write protection with jumper
The jumper is used for enabling write protection.
When write protection is enabled with the jumper:
● Measured values are read-only.
● The display changes automatically between the measured values.
● Operation via the buttons is disabled.
Procedure
1. De-energize the device.
2. Use a 3 mm Allen key to loosen the front safety catch.
3. Remove the front cover connector of the device.
Operating
7.4 Locking the device
SITRANS P320/P420 with 4 to 20 mA/HART
82 Operating Instructions, 11/2019, A5E44852162-AC
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