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Reference Manual
00809-0200-4101, Rev AA
July 2008
Rosemount 2051
2-24
NOTE
The transient protection terminal block does not provide transient protection
unless the transmitter case is properly grounded. Use the guidelines to
ground the transmitter case. Refer to page 2-25.
Do not run the transient protection ground wire with signal wiring as the
ground wire may carry excessive current if a lightning strike occurs.
Jumpers Security
After you configure the transmitter, you may want to protect the configuration
data from unwarranted changes. Each transmitter is equipped with a security
jumper that can be positioned “ON” to prevent the accidental or deliberate
change of configuration data. The jumper is located on the front side of the
electronics module and is labeled SECURITY (see Figure 2-15).
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 Jumper Procedure
To reposition the jumper, 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. Refer to Figure 2-15.
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.
Simulate
The simulate jumper is used in conjunction with the Analog Input (AI) function
block. This switch is used to simulate the measurement. To enable the
simulate feature, insert the jumper across “ENABLE” (see Figure 2-15) while
the transmitter is powered.
NOTE
When power is cycled to the transmitter, simulate is automatically disabled
regardless of the position of the jumper. This prevents the transmitter from
being accidentally left in simulate mode. Therefore, to enable the simulate
feature, the jumper must be inserted after power is applied to the transmitter.