Logix
®
420 Digital Positioner FCD LGENIM0106-07-AQ – 10/15
20
10.1.2 Scrolling Status Messages
The Scrolling Status Message provides the following information as
applicable:
Ambient Temperature –
This is the temperature inside the positioner.
DIP Switch Override –
This indicates that the Configuration (DIP)
Switches do not reflect the actual configuration of the positioner. This
can happen if a Configuration Switch is changed after a Quick-Cal, or if
the configuration is was changed from the DTM. Performing a Quick-
Cal will reset the configuration to what the Configuration Switches
show, which may not be desirable. Ensure the Configuration Switches
are set properly before performing a Quick-Cal.
10.1.3 Current Alarm Status
The Current Alarm Status area shows the highest priority alarm,
warning, alert or status indication. This matches the code indicated by
the flashing LEDs.
10.1.4 Status Icons
Status icons continuously show the state of the features and modes.
Table 12: Status Icons
Icon Location
Icon
Icon Meaning
Command
Source
Analog command mode
Digital command mode
Out of service
Pressure
Control
Pressure control locked
(blank)
Pressure control not locked
HART
Communications
HART communication currently
in progress
Burst mode in progress
(blank)
No HART communication
currently in progress
Command Source Icons –
The positioner is in Analog Command mode
if it is using the 4-20 mA signal to control the location of the valve. In
Digital Command mode, the positioner ignores the 4-20 command
and responds to the position command given through HART. In Out
Of Service mode, the positioner is performing a calibration, signature,
partial stroke test or is in a factory reset state.
Pressure Control –
When the position of the valve gets very close to the
commanded position, the positioning algorithm will change to pressure
control. This means the pressures will be held constant (locked),
improving the stability of the valve position. The point at which the
pressure control is locked depends on the Valve Stability switch on the
positioner. When the switch is set to “Lo Friction”, the locking point is
self-adjusting to optimize accuracy. When the switch is set to “Hi Fric-
tion” and the deviation is smaller than +/- 1.0%, the pressure “locks”.
This value can be adjusted using the Display Menu or DTM. See section
10.3.7 CONFIGURATION (PRESSURE CONTROL).
HART Communications Icons –
When the positioner is sending or
receiving data via the HART communication protocol, the icon will be
displayed. During burst mode, a pulsating heart icon will be displayed.
10.1.5 Adjusting the Display Contrast
To adjust the display contrast, hold the
◄
Back button for 3 seconds.
Use the
▲
Up and
▼
Down buttons to adjust the contrast. Use the
►
ACCEPT/QUICK-CAL to accept the settings.
