Emerson 3051S Specifications Page 30

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20
Reference Manual
00809-0100-4001, Rev JA
Section 2: Installation
November 2012
Installation
2.8.7 Configure security and alarm
Security (write protect)
There are three security methods with the Rosemount 3051 transmitter:
1. Security Jumper: prevents all writes to transmitter configuration.
2. Local Keys (Local Zero and Span) Software Lock Out: prevents changes to transmitter
range points via local zero and span adjustment keys. With local keys security enabled,
changes to configuration are possible via HART.
3. Physical Removal of Local Keys (Local Zero and Span) Magnetic Buttons: removes ability
to use local keys to make transmitter range point adjustments. With local keys security
enabled, changes to configuration are possible via HART.
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.
Configuring transmitter security and alarm jumper procedure
To reposition the jumpers, follow the procedure described below.
1. 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.
2. Remove the housing cover opposite the field terminal side. Do not remove the
transmitter covers in explosive atmospheres when the circuit is live.
3. Reposition the jumpers as desired.
–Figure2-13 shows the jumper positions for the 4-20 mA HART Transmitter.
–Figure2-14 shows the jumper positions for the 1-5 HART Vdc Low Power
Transmitter.
4. Reattach the transmitter cover. Always ensure a proper seal by installing the electronics
housing covers so that metal contacts metal to meet explosion-proof requirements.
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