8
Reference Manual
00809-0200-4728, Rev SA
Configuration
July 2018
Configuration
Figure 2-3. LOI Configuration Buttons
A. Configuration buttons
LOI password
An LOI password can be entered and enabled to prevent review and modification of device configuration
via the LOI. This does not prevent configuration from HART or through the control system. The LOI
password is a four-digit code that is to be set by the user. If the password is lost or forgotten the master
password is “9307”. The LOI password can be configured and enabled/disabled by HART communication
via a Field Communicator, AMS Device Manager, or the LOI.
LOI menu trees are available in
Appendix C: Local Operator Interface (LOI)
2.4.3
Setting the loop to manual
When sending or requesting data that would disrupt the loop or change the output of the transmitter,
set the process application loop to manual. The Field Communicator, AMS Device Manager or LOI will
prompt you to set the loop to manual when necessary. Acknowledging this prompt does not set the loop
to manual.
The prompt is only a reminder; set the loop to manual as a separate operation.
2.4.4
Failure mode
As part of normal operation, each transmitter continuously monitors its own performance. This
automatic diagnostics routine is a timed series of checks repeated continuously. If diagnostics detect an
input sensor failure or a failure in the transmitter electronics, the transmitter drives its output to low or
high depending on the position of the failure mode switch. If the sensor temperature is outside the range
limits, the transmitter saturates its output to 3.9 mA for standard configuration on the low end (3.8 mA if
configured for NAMUR-compliant operation) and 20.5 mA on the high end (or NAMUR-compliant).
These values are also custom configurable by the factory or using the Field Communicator.The values to
which the transmitter drives its output in failure mode depend on whether it is configured to standard,
NAMUR-compliant, or custom operation. See Rosemount 644 Tempeture Transmitter
for standard and NAMUR-compliant operation parameters.
Table 2-2. LOI Button Operation
Button
Left
No
SCROLL
Right
Yes
ENTER
A
Summary of Contents for Rosemount 644 with HART Protocol
Page 2: ......
Page 8: ...vi Reference Manual 00809 0200 4728 Rev SA Title Page July 2018 Title Page ...
Page 48: ...40 Reference Manual 00809 0200 4728 Rev SA Configuration July 2018 Configuration ...
Page 62: ...54 Reference Manual 00809 0200 4728 Rev SA Installation July 2018 Installation ...
Page 111: ......
