Communications bus and supply power terminal blocks, ratings, and requirements
Table 7: 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
1
+
-
FC Bus Communications
COM
Signal Reference (Common) for Bus communications
FC BUS
SHLD
Isolated terminal
0.6 mm (22 AWG) stranded, 3-wire
twisted, shielded cable recommended
FC BUS (Port)
FC Bus
RJ-12 6-Position Modular Connector provides:
FC Bus Communications
FC Bus Signal Reference and 15 VDC Common
15 VDC, 180 mA, Power for Bluetooth Commissioning
Converter (BTCVT) or ZFR or ZFR Pro Wireless Router
3
Bluetooth Commissioning Converter
retractable cable or 24 AWG 3-pair
CAT 3 Cable <30.5 m (100 ft)
+
-
SA Bus Communications
COM
SA Bus Signal Reference and 15 VDC Common
SA BUS
SA PWR
15 VDC Supply Power for Devices on the SA Bus
(Maximum total current draw for SA Bus is 240 mA.)
0.6 mm (22 AWG) stranded, 4-wire
(2 twisted-pairs), shielded cable
recommended.
Note:
The + and - wire are one
twisted pair, and the COM and
SA PWR are the second twisted
pair of wires.
SA BUS (Port)
SA BUS
RJ-12 6-Position Modular Connector provides:
SA Bus Communications
SA Bus Signal Reference and 15 VDC Common
15 VDC Power for devices on the SA bus and BTCVT
24 AWG 3-pair CAT3 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)
14 VA
0.8 mm to 1.0 mm
(18 AWG) 2-wire
< 30 m (100 ft)
1
See
Input and Output wiring guidelines
to determine wire size and cable lengths for cables other than the recommended cables.
2
The FC bus and SA bus wiring recommendations in this table are for MS/TP Bus communications at 38.4k baud. For more
information, refer to the
MS/TP Communications Bus Technical Bulletin (LIT-12011034)
.
3
The MAP Gateway serves as a replacement for the BTCVT, which is no longer available for purchase, but continues to be supported.
M4-CGM General Purpose Application Controllers Installation Guide
11
