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Communications bus and power
supply terminal block rating and
requirements table
Table 4: Communications bus and supply power terminal blocks, functions, ratings, requirements, and
cables
Terminal block/
Terminal
Port label
labels
+
-
COM
FCBUS
or
SHLD
SABUS
or
SAPWR
SA/FC BUS
(Port)
HOT
24~
COM
1
See Table 3 to determine wire size and cable lengths for cables.
Note: The SA Bus and FC Bus wiring
recommendations in this table are for MS/TP
bus communications at 38,400 baud. For more
information, refer to the MS/TP Communications
Bus Technical Bulletin (LIT-12011034).
12
IOM1711 and IOM2711 Input/Output Module Installation Guide
Function, electrical ratings/Requirements
FC or SA Bus Communications
Signal Reference (Common) for FC or SA bus communications
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 supplies 15
VDC to devices on the SA Bus requiring power.
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 ZFR181x/ZFR182x Wireless
Router
(Maximum total current draw for SA Bus is 240 mA.)
24 VAC Power Supply - Hot
Supplies 20-30 VAC (Nominal 24 VAC)
24 VAC Power Supply - Common
(Isolated from all other Common terminals on controller.)
Recommended cable type
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.
Wireless Commissioning Converter
retractable cable or 24 AWG 3-pair
CAT 3 Cable <30.5 m (100 ft)
0.8 mm to 1.0 mm
(18 AWG) 2-wire
1
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