Comm bus and power supply terminal block rating
and requirements table
Table 5: Communications bus and supply power terminal blocks, functions, ratings,
requirements, and cables
Terminal
block/Port
label
Terminal
labels
Function, electrical ratings/Requirements
Recommended cable
type
+
-
FC or SA Bus Communications
COM
Signal Reference (Common) for FC or SA bus
communications
FCBUS
or
SABUS
SHLD
or
SAPWR
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 FX-
PCX controller does not supply 15 VDC.
The SA bus supervisor supplies 15 VDC
to devices on the SA Bus requiring
power.
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.
SA/FC BUS
(Port)
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 FX-ZFR181x/FX-
ZFR182x Wireless Router
(Maximum total current draw for SA Bus is
240 mA.)
Bluetooth Commissioning
Converter retractable
cable or 24 AWG 3-pair CAT
3 Cable <30.5 m (100 ft)
HOT
24 VAC Power Supply - Hot
Supplies 20-30 VAC (Nominal 24 VAC)
24~
COM
24 VAC Power Supply - Common
(Isolated from all other Common terminals
on controller.)
0.8 mm to 1.0 mm
(18 AWG) 2-wire
1
See Table 4 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
FX-PC Series ControllersMS/
TP Communications Bus Technical Bulletin (LIT-12011670)
or
MS/TP Communications Bus for BCPro
System Technical Bulletin (LIT-12011908)
.
21
FX-PCX17 and FX-PCX27 Expansion Input/Output Module Installation Instructions
