Table 1 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 1 observe these guidelines when wiring an SA or FC bus and the 24 VAC supply power:
- Run all low-voltage wiring and cables separate 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 regarding wire size and cable length requirements for the SA and FC buses.
- Refer to the N2 Communications Bus Technical Bulletin (LIT-636018) for detailed information regarding wire size and cable length requirements for the N2 bus.
| Terminal Block/Port Label | Terminal Labels | Function, Electrical Ratings/Requirements | Recommended Cable Type |
|---|---|---|---|
|
FC BUS/SA BUS
FC BUS (Upper) |
+ | FC Bus Communications | 0.6 mm (22 AWG) stranded, 3-wire twisted, shielded cable recommended |
| - | |||
| COM | Signal Reference (Common) for Bus communications | ||
| SHD | Isolated terminal (optional shield drain connection) | ||
|
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, 71.5 ohms at 4 W, Power for Bluetooth Commissioning Converter or ZFR1811 Wireless Router |
24 AWG 3-pair CAT3 cable <30.5 m (100 ft) |
|
FC BUS/SA BUS
SA BUS (Lower) |
+ | SA Bus Communications | 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.
|
| - | |||
| COM | SA Bus Signal Reference and 15 VDC Common | ||
| PWR | 15 VDC Supply Power for Devices on the SA bus (Maximum total current draw for SA bus is 240 mA.) | ||
| 24~ INPUT | HOT |
24 VAC Power Supply - Hot
Supplies 20–30 VAC (Nominal 24 VAC) |
0.8 mm to 1.5 mm2 (18 AWG) 2-wire |
| COM |
24 VAC Power Supply Common (Isolated
from all other Common terminals on controller) 20 VA at 24 VAC nominal |
||
| 24~ OUT | 24~ | 24 VAC Utility Supply (for actuators) 80 mA continuous | 0.8 mm to 1.5 mm2 (18 AWG) 2-wire |
| COM | 24 VAC Power Supply Common | ||
| MOD BUS | + | Modbus communications | 0.6 mm (22 AWG) stranded, 4-wire(2 twisted pairs), shielded cable recommended |
| - | |||
| COM | Signal Reference (Common) for bus communications |