Johnson Controls IOM3721, Руководство по установке

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SA/FC Bus and Supply Power
Wiring Guidelines
Table 4 provides information about the functions, ratings,
and requirements for the field controller communication
bus and supply power terminals; and guidelines for wire
sizes, cable types, and cable lengths when wiring the
controller communication buses and supply power.
In addition to the guidelines in Table 4 , observe these
guidelines when wiring an SA or FC bus and the 24 VAC
supply power:
• Run all low-voltage wiring and cables separate from
high-voltage wiring.
• All SA and FC bus cables, regardless of wire size,
should be twisted, insulated, stranded copper wire.
• Shielded cable is strongly recommended for all SA
and FC bus cables.
•
Refer to the MS/TP Communications Bus Technical
Bulletin (LIT-12011034) for detailed information
regarding wire size and cable length requirements for
the SA and FC buses.
Table 4: Communications Bus and Supply Power Terminal Blocks, Functions, Ratings, Requirements, and
Cables
Recommended Cable Type
1 Function, Electrical Ratings/Requirements Terminal
Labels Terminal
Block/Port Label
FC Bus: 0.6 mm (22 AWG)
stranded, 3-wire twisted, shielded
cable recommended.
SA Bus: 0.6 mm (22 AWG)
stranded, 4-wire (2 twisted-pairs),
shielded cable recommended.
Note: On the SA Bus, the + and -
wire are one twisted pair,
and the COM and SA PWR
are the second twisted pair
of wires.
FC or SA Bus Communications +
-
FCBUS
2
or
SABUS
2
Signal Reference (Common) for FC or SA Bus
communications COM
SHLD on FC Bus: Isolated terminal (optional shield drain
connection
SAP WR on SA Bus: 15 VDC power lead connection
Note: The SA PWR terminal on an IOM controller does
not supply 15 VDC. The SA bus supervisor (FAC,
FEC, or VMA) supplies 15 VDC to devices on the
SA bus requiring power.
SHLD
or
SAPWR
Wireless Commissioning Converter
retractable cable or 24 AWG 3-pair
CAT 3 Cable <30.5 m (100 ft) RJ-12 6-Position Modular Connector provides:
FC or SA Bus Communications
FC or SA Bus Signal Reference and 15 VDC Common
Commissioning Converter or ZFR 1811 Wireless Router
(Maximum total current draw for SA Bus is 240 mA.)
SA/FC BUS
2
(Port)
0.8 mm to 1.5 mm
2
(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.)
COM
1 See Table 3 to determine wire size and cable lengths for cables.
2 The SA Bus and FC Bus wiring recommendations in this table are for MS/TP bus communications at 38400 baud. For more
information, refer to the MS/TP Communications Bus Technical Bulletin (LIT-12011034) .
8 IOM3721 Input/Output Module Installation Instructions