Table 5: Communications Bus and Supply Power Terminal Blocks, Functions, Ratings, Requirements, and
Cables
Recommended Cable Type
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
or
SABUS
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 a controller does not
supply 15 VDC. The SA bus supervisor supplies 15 VDC
to devices on the SA bus requiring power.
SHLD
or
SAPWR
Bluetooth 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 FX-ZFR1811 Wireless Router
(Maximum total current draw for SA Bus is 240 mA.)
SA/FC BUS
(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
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
FX-PC Series Controllers MS/TP Communications Bus Technical Bulletin (LIT-12011670)
or
MS/TP
Communications Bus for BCM System Technical Bulletin (LIT-12011908)
.
Setup and Adjustments
Setting the Device Addresses
FX-PCX 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 (
).
Device addresses 4 through 127 are the valid addresses
for these controllers.
The DIP switch block has eight switches numbered 128,
64, 32, 16, 8, 4, 2, and 1. Switches 64 through 1 are
device address switches. Switch 128 is a mode switch
that enables a controller to operate on an FX-ZFR Series
Wireless Field Bus. Switch 128 must be set to off for all
hard-wired SA and FC bus applications. Set switch 128
to ON for wireless FC bus applications
only
.
Figure 9: Device Address DIP Switch Block Set to
Address 21
Note:
FX-PCX controllers ship with switch 128 ON and
the remaining address switches off rendering the
controllers wired slave devices, which do not
operate on MS/TP buses, but will not interfere
with bus operation. Set a valid and unique device
address on the controller before applying power
to the controller on the bus.
To set the device addresses on FX-PCX controllers:
9
FX-PCX3721 Expansion Input/Output Module Installation Instructions
