Concept
Wire Sizes and Lengths for the AS-B Servers
This section provides recommendations on wire sizes and lengths for the AS-B servers.
For more information, see AS-B Servers .
The recommendations are for guidance only. Other wire sizes and lengths may be used, depending on wiring rules and when appropriate.
|
Terminals |
Minimum Cross-sectional Area |
Maximum Cable Length |
|
Power input terminals (1, 2) |
0.75 mm² (18 AWG) a |
According to local wiring rules |
|
Earth ground terminal (3) |
0.75 mm² (18 AWG) a |
According to local wiring rules |
|
Return (RET) terminals (4, 5), connected to ground rail |
1.3 mm² (16 AWG) |
As short as possible within the same panel, maximum 1.5 m (4.8 ft). |
|
RS-485 terminals (6, 7, 8, 9) |
For more information, see RS-485 Communications . |
For more information, see RS-485 Communications . |
|
Digital inputs and universal inputs/outputs as digital b inputs |
0.34 mm² (22 AWG) |
200 m (650 ft) |
|
Universal inputs/outputs as analog c inputs |
0.34 mm² (22 AWG) |
100 m (330 ft) |
|
Universal inputs/outputs as temperature (thermistor) inputs, up to 75 °C (167 °F) |
0.75 mm² (18 AWG) |
75 m (250 ft) |
|
Universal inputs/outputs as temperature (thermistor) inputs, up to 75 °C (167 °F) |
1.5 mm² (15 AWG) |
150 m (500 ft) |
|
Universal inputs/outputs as temperature (thermistor) inputs, up to 150 °C (302 °F) |
1.5 mm² (15 AWG) |
75 m (250 ft) |
|
Universal inputs/outputs, for actuators and transmitters powered from the same transformer as the AS-B sever |
0.75 mm² (18 AWG) |
20 m (65 ft) |
|
Universal inputs/outputs, for actuators and transmitters powered from their own transformer (external or internal) |
0.34 mm² (22 AWG) |
200 m (650 ft) |
|
Universal inputs/outputs as voltage outputs, for actuators powered from their own transformer (external or internal) or when the outputs have isolated converters |
0.34 mm² (22 AWG) |
200 m (650 ft) |
|
Relay outputs |
According to local wiring rules d |
According to local wiring rules d |
|
Triac outputs |
0.5 mm² (20 AWG) d |
According to local wiring rules d |
- Use wires rated for at least 90 °C (194 °F).
- Digital or counter inputs.
- Supervised, voltage, current, resistive, 2-wire RTD temperature, or 2-wire RTD resistive inputs.
- Confirm the voltage drop from the external load current and the wire resistance (the product of the wire size and length) to obtain the appropriate voltage arriving at the controlled field device (load), to reliably energize and maintain the control action.
I/O Wiring
Wire Sizes and Lengths
AS-B Servers
AS-B Server Screw Terminals
Wiring
RS-485 Communications