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SA/FC bus and supply power wiring guidelines
Table 6 provides information about the functions, ratings, and requirements for the communication bus and supply
power terminals; and guidelines for wire sizes, cable types, and cable lengths when wiring the controller's
communication buses and supply power.
In addition to the guidelines in Table 6, observe the following guidelines when you wire an SA or FC bus and the 24
VAC supply power:
•
Run all low-voltage wiring and cables separately 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 about wire
size and cable length requirements for SA and FC buses.
Table 6: Communications bus and supply power terminal blocks, functions, ratings, requirements, and
cables
Terminal
Terminal
block/port
labels
label
+
2
FCBUS
-
or
2
SABUS
COM
SHLD
or
SAPWR
2
SA/FC BUS
(Port)
24~
HOT
COM
1.
See Table 5 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 38,400 baud. For more
information, refer to the MS/TP Communications Bus Technical Bulletin (LIT-12011034).
Setup and adjustments
Setting the device addresses
PEAK field controllers are master devices on MS/TP (SA or FC) buses. Before operating controllers on a bus, you
must set a valid and unique device address for each controller on the bus. You set a controller's device address by
setting the positions of the switches on the DIP switch block at the top of the controller (Figure 9). Device
addresses 4 through 127 are the valid addresses for these controllers.
Function, electrical ratings and 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 ZFR1811 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.)
PEAK® IOM57 Input/Output Modules Installation Instructions
14
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)
2
0.8 mm to 1.5 mm
(18 AWG) 2-wire
1
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