The controller cover is held in place by four plastic latches
that extend from the base and snap into slots on the
inside of the housing cover.
To remove the controller cover:
1. Place your fingernails under the two cover lift tabs
(
) on the sides of the housing cover and
gently pry the top of the cover away from the base to
release the cover from the two upper latches.
2. Pivot the top of the cover further to release it from the
lower two latches.
3. Replace the cover by placing it squarely over the
base, and then gently and evenly push the cover on
to the latches until they snap into the latched position.
Figure 10: FEC26 with Cover Removed Showing EOL
Switch and Jumper Positions
Setting the End-of-Line (EOL) Switch
Each controller has an EOL switch, which, when set to
ON, sets the controller as a terminating device on the
bus. See
for the EOL switch location. The default
EOL switch position is Off.
Figure 11: End-of-Line Switch Positions
To set the EOL switch on a field controller:
1. Determine the physical location of the controller on
the FC bus.
2. Determine if the controller must be set as a
terminating device on the bus.
Note:
Refer to the
MS/TP Communications Bus
Technical Bulletin (LIT-12011034)
for detailed
information regarding EOL termination rules
and EOL switch settings on FC buses.
3. If the controller is a terminating device on the FC bus,
set the EOL switch to ON. If the controller is not a
terminating device on the bus, set the EOL switch to
Off.
When a field controller is connected to power with its
EOL switch set to ON, the amber EOL LED on the
controller cover is lit.
Setting the Input and Output
Jumpers
Binary Output (BO) Source Power
Selection Jumpers
Risk of Electric Shock:
Disconnect supply power to
the field controller before attempting to adjust the Binary
Output Source Power Selection Jumpers. Failure to
disconnect the supply power may result in electric shock.
Mise En Garde: Risque de décharge électrique:
Débrancher l'alimentation de l'controller avant tout
réglage du Binary Output Source Power Selection
Jumpers. Le non-respect de cette précaution risque de
provoquer une décharge électrique.
Important:
Do
not
connect an external power source
to a BO when the BO power source jumper
is in the internal power (INT) position.
Connecting external power to a BO that
sources internal power can damage the
controller and void any warranties.
The BO source power selection jumpers determine
whether a BO provides internal power (sourced from the
controller) to the output load (INT position) or requires
an external power source (EXT position) for the output
load.
shows an example of a controller BOs
and the associated power selection jumpers to the right
of the BOs terminal block.
24
FEC26Field Equipment Controllers Installation Instructions
