Emerson Rosemount 2051 Reference Manual page 24

Installation
March 2024
2.5.7 Configure security and alarm
Security (Write protect)
There are three security methods with the Rosemount 2051 transmitter:
Procedure
1. Security Jumper: prevents all writes to transmitter configuration.
2. Local Keys (Local Zero and Span) Software Lock Out: prevents changes to transmitter
3. Physical Removal of Local Keys (Local Zero and Span) Magnetic Buttons: removes
Configuring transmitter security and alarm jumper procedure
To reposition the jumpers, follow the procedure described below:
CAUTION
Do not remove the transmitter covers in explosive atmospheres when the circuit is live. If
the transmitter is live, set the loop to Manual and remove power.
Procedure
1. Remove the housing cover opposite the field terminal side. Do not remove the
2. Reposition the jumpers as desired.
3. Reattach the transmitter cover.
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range points via local zero and span adjustment keys. With local keys security
enabled, changes to configuration are possible via HART
ability to use local keys to make transmitter range point adjustments. With local keys
security enabled, changes to configuration are possible via HART.
Note
The Local Keys (Local Zero and Span Adjustments) are optional (option code D4 in
model number). If the Adjustments are not ordered on the transmitter, options 2
and 3 above are not valid security method options.
You can prevent changes to the transmitter configuration data with the write
protection jumper. Security is controlled by the security (write protect) jumper
located on the electronics board or LCD display. Position the jumper on the
transmitter circuit board in the ON position to prevent accidental or deliberate
change of configuration data.
If the transmitter write protection jumper is in the ON position, the transmitter will
not accept any "writes" to its memory. Configuration changes, such as digital trim
and reranging, cannot take place when the transmitter security is on.
Note
If the security jumper is not installed, the transmitter will continue to operate in the
security OFF configuration.
transmitter covers in explosive atmospheres when the circuit is live.
• Figure 2-12 shows the jumper positions for the 4-20 mA HART
• Figure 2-13 shows the jumper positions for the 1-5 HART Vdc Low Power
Transmitter.
Always ensure a proper seal by installing the electronics housing covers so that
metal contacts metal to meet explosion-proof requirements.
Reference Manual
00809-0100-4101
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Transmitter.
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Emerson.com/Rosemount