Johnson Controls MS-FEC1611-1U Installation Instructions Manual page 20

Note: Metasys FEC 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 will 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
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
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 field 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.
Refer to the MS/TP Communications Bus Technical Bulletin (LIT-12011034) for more information on controller
device addresses and how to set them on MS/TP buses.
Refer to the Modernization Guide for Legacy N2 Controllers (LIT-12012005) for more information on controller
device addresses and how to set them on N2 buses.
Table 6: SA/FC Bus Device Address Descriptions for MS/TP Controllers
Device Address
0
(Switch 128 Off)
1 to 3
(Switch 128 Off)
4 to 127
(Switch 128 Off)
FEC1611 and FEC1621 Field Equipment Controller Installation Instructions
Figure 9: Device Address DIP Switch Block Set to Address 21
Use on Description
Reserved for FC Bus Supervisory Controller (not for use on field controllers).
Reserved for peripheral devices (not for use on field controllers).
Used for MS/TP master devices (field controllers) that are hardwired to an SA Bus or FC Bus.
Table 6 for valid device addresses.
Figure 9.
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