Setup And Adjustments - Johnson Controls IOM2710 Installation Instructions Manual

Wiring Requirements
137 m 450 ft
122 m 400 ft
107 m 350 ft
91 m 300 ft
76 m 250 ft
61 m 200 ft
46 m (150 ft)
31 m 100 ft
15 m 50 ft
0 m 0 ft
Table 2: Wire Gauge and Length Guidelines
Guideline Cable Size
A
1.5 mm (18 AWG)
0.8 mm (20 AWG)
0.6 mm (22 AWG)
N/A (24 AWG)
B
1.5 mm (18 AWG)
0.8 mm (20 AWG)
0.6 mm (22 AWG)
N/A (24 AWG)
C See Figure 8.

Setup and Adjustments

The IOM controller can reside on either the FC Bus or
the SA Bus. When you set the address, you are setting
the address for the specified bus. The IOM controller
can only be on one bus at a time.
Determining the FC Bus or SA Bus Address
The ADDRESS DIP switch sets a unique address for
the controller (or module) on the FC Bus or SA Bus.
Set the address to 4-127 for an IOM. For best
performance, all devices on the same Bus (FC Bus or
SA Bus) should have consecutive addresses. Do not
use Addresses 128 and above when connecting the
IOM to the FC Bus or SA Bus. For more information,
refer to the MS/TP Communications Bus Technical
Bulletin (LIT-12011034).
( )
( )
( ) 1.5 mm (18 AWG)
( )
( )
0.8 mm (20 AWG)
( )
0.6 mm (22 AWG)
( )
N/A (24 AWG )
( )
( )
0 50 100
Figure 8: Maximum Wire Length by Current and Wire Size
Maximum Length
457.2 m (1,500 ft)
297.2 m (975 ft)
182.9 m (600 ft)
106.7 m (350 ft)
228.6 m (750 ft)
137.1 m (450 ft)
91.4 m (300 ft)
61 m (200 ft)
See Figure 8.
IOM2710 and IOM3710 Input/Output Modules Installation Instructions
2
150 200 250 300
Load Current (mA)
Assumptions
100 mV maximum voltage drop
100 mV maximum voltage drop
N/A
Table 3 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 Description
Address
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 Disables (Off) or Enables (ON) a controller for
wireless operation.
129-255 Are not valid addresses for FEC or IOM
controllers on the SA or FC Bus.
350 400 450 500
7