Johnson Controls FAC2611-0U, Installation Instructions Manual, Page: 19 / 25

Table 5: Communications Bus and Supply Power Terminal Blocks, Functions, Ratings, Requirements, and
Cables
Recommended Cable Type Function, Electrical Ratings/Requirements Terminal
Labels Terminal
Block/Port
Label
0.8 mm to 1.0 mm
(18 AWG) 2-wire
24 VAC Power Supply - Hot
Supplies 20–30 VAC (Nominal 24 VAC)
HOT 24~
24 VAC Power Supply Common (Isolated from all other
Common terminals on controller)
14 VA
COM
1 The SA Bus and FC Bus wiring recommendations in this table are for MS/TP bus communications at 38.4k baud. For more
information, refer to the
MS/TP Communications Bus Technical Bulletin (LIT-12011034) .
Setup and Adjustments
Setting the Device Addresses
Metasys ® field controllers are master devices on MS/TP
(SA or FC) buses. Before operating field controllers on
a bus, you
must set a valid and unique device address
for each controller on the bus. You set a field controller's
device address by setting the positions of the switches
on the DIP switch block at the top of the controller (
Figure
3 ). Device addresses 4 through 127 are the valid
addresses for these controllers.
The DIP switch block has eight switches numbered 128,
64, 32, 16, 8, 4, 2, and 1 (
Figure 9 ). Switches 64 through
1 are device address switches. Switch 128 is a mode
switch that enables a controller to operate on a ZFR/ZFR
Pro Series Wireless Field Bus. Set switch 128 to Off for
all hard-wired SA and FC bus applications.
Figure 9: Device Address DIP Switch Block Set to
Address 21
Note: Metasys ® field controllers ship with switch 128
ON and the remaining address switches off
rendering the controllers wired slave devices,
which do not operate on MS/TP buses, but do not
interfere with bus operation. Set a valid and
unique device address on the controller before
applying power to the controller on the bus.
To set the device addresses on Metasys ® field
controllers:
1. Set all of the switches on the address DIP switch
block (128 through 1) to Off.
2. Set one or more of the seven address switches (64
though 1) to ON, so that the sum of the switch
numbers set to ON equals the intended device
address. See
Table 6 for valid device addresses.
Set the highest number switch that is less than or
equal to the intended device address to ON. Then
continue setting lower numbered switches until the
total equals the intended address. For example, if the
intended device address is 21, set switch 16 to ON
first, then set switch 4 ON, followed by switch 1
(16+4+1= 21). See
Figure 9 .
3. Set switch 128 to OFF for all hard-wired SA and FC
bus applications.
Note: Do not connect a controller with switch 128
set to ON to an active ( hard-wired ) SA or FC
bus. When a controller with switch 128 set to
ON and a device address from 4 to 127 is
connected to a wired field bus, the entire field
bus is rendered inoperable until the controller
is disconnected or switch 128 is set to Off.
4. Set a unique and sequential device address for each
of the controllers connected on the SA or FC bus
starting with device address 4.
To ensure the best bus performance, set sequential
device addresses with no gaps in the device address
range (4, 5, 6, 7, 8, 9, and so on). The controllers do
not need to be physically connected on the bus in
their numerical device address order.
5. Write each controller's device address on the white
label below the DIP switch block on the controller's
cover.
Table 6 describes the FC bus and SA bus devices
addresses for Johnson Controls ® MS/TP
communications bus applications.
19 FAC2611-0U Advanced Application Field Equipment Controller Installation Instructions