FEU16x0 Field Equipment Controller Installation Instructions
10
Wiring Requirements
Use
to determine the maximum wire length allowable when alternative wire gauges are required.
Setup and Adjustments
Determining the FC Bus Address
The FC Bus address switch sets a unique address for this controller on the FC Bus. You must set the FEC’s device
address for your field bus application.
Set consecutive device addresses 4 through 127 for Field Equipment Controllers and other master devices on the
FC Bus. Use sequential addressing with no gaps in the device address range to ensure best FC Bus performance.
Note:
Switch 128 on the device address DIP switch block should be set to
Off
.
shows and describes the valid FC Bus and SA Bus devices addresses for FECs and IOMs on Johnson
Controls® MS/TP communications bus applications.
Table 3: FC Bus Device Address Descriptions
Device
Address
Description
0
Reserved for FC Bus supervisory controller.
1-3
Reserved for peripheral devices.
4-127
Available for FECs on the FC bus and IOMs
on the SA or FC Bus.
128
Unused and should be set to
Off
.
129-255
Are
not valid
addresses for FEC or IOM
controllers on the SA or FC Bus.
Figure 7: Maximum Wire Length by Current and Wire Size
450
500
400
350
300
250
200
150
100
50
0
0 m (0 ft)
15.2 m (50 ft)
30.5 m (100 ft)
45.7 m (150 ft)
61 m (200 ft)
76.2 m (250 ft)
91.4 m (300 ft)
106.7 m (350 ft)
121.9 m (400 ft)
137.2 m (450 ft)
Load Current (mA)
Length
F
IG:
wi
r_
ln
g
th
1.0 mm (18 AWG)
0.8 mm (20 AWG)
0.6 mm (22 AWG)
0.5 mm (24 AWG )
