Johnson Controls FAC2611-0U, Installation Instructions Manual, Page: 22 / 25

UI Current Loop Jumpers
The current loop fail-safe jumpers are on the circuit board
under the controller cover near the UI terminals (
Figure
10 ). When a UI is defined (in the system software) as a
4-20 mA Analog Input and the UI’s current loop jumper
is in the Disabled (default) position (
Figure 13 ), the 4-20
mA current loop circuit opens whenever power to the
controller is interrupted or off.
Figure 13: Current Loop Jumper Positions
Setting the current loop jumper to the Enabled position
(
Figure 13 ) connects an internal 100 ohm resistor across
the UI terminals, which maintains the 4-20 mA current
loop circuit even when power to the controller is
interrupted or off.
Important: Current Loop jumpers must be in the
Disabled (default) position for all UIs that
are not set up to operate as 4-20 mA analog
inputs.
Table 7 identifies the current loop switches associated
with each UI on the FAC2611 controller.
Table 7: FAC2611 UI Inputs and Jumper Labels
Switch Label on Current Loop DIP
Switch Block Board Universal Input
Label
J20 IN1
J21 IN2
J22 IN3
J23 IN4
J24 IN5
J25 IN6
Commissioning Field Controllers
You commission BACnet ® MS/TP field controllers with
the Controller Configuration Tool (CCT) software. Refer
to
Controller Tool Help (LIT-12011147) for detailed
information on commissioning field controllers.
22 FAC2611-0U Advanced Application Field Equipment Controller Installation Instructions