AS-Interface card specifications

AS-Interface cable

The two-conductor AS-Interface cable supplies both power and data for field devices. An AS-Interface network can include branches. The total cable length, (main line and all branches), cannot exceed 100 meters. Refer to the AS-Interface standard (EN 50295) for design and engineering details on AS-Interface cable. For complete information on installing AS-Interface devices, visit the AS-Interface Web site.

Table: AS-Interface cable distance limits
Item	Specification
Recommended cable	Unshielded AS-Interface yellow cable.⁽¹⁾
Distance limits	100 meters total length (main line and branches) without repeater or extender. 300 meters total length (main line and branches) with two repeaters.⁽²⁾ 300 meters total length (main line and branches) with one extender and one repeater.

⁽¹⁾ Any other cable, shielded or unshielded, can be used if the installation meets all the impedance requirements specified in the AS-Interface standard (EN 50295).

⁽²⁾ Repeaters require an additional AS-Interface power supply on the far side of the repeater.

Installation notes

The Interface terminal block is recommended to provide terminations for field wiring for the AS-Interface card.
It is recommended that you do not connect the AS-Interface devices directly to the AS-Interface card terminals. Use one AS-Interface cable to connect the AS-Interface card to the power supply and use another AS-Interface cable to connect the devices to the power supply.
If you are using extenders and repeaters, refer to the device data sheet for additional cabling recommendations.
The AS-Interface bus requires a special AS-Interface power supply (purchased separately) that provides electrical isolation from the data signals. A standard power supply can be used but it must have a conditioning module added to its output. Refer to the AS-Interface standard (EN 50295) for design and engineering details on the AS-Interface power supply.
This card requires an S-series.

Specifications

Table: AS-Interface card specifications
Item	Specifications
Number of ports	Two
Port Type	Actuator Sensor-Interface - 167 kb/second
LocalBus Current	300 mA maximum
24 VDC Field circuit power, per card	None
30 VDC AS-Interface field power per port	70 mA (maximum)
Isolation	Each port is optically isolated from the system and from each other and factory tested to 1500 VDC.
Heat dissipation	7.0 W
Mounting	Assigned slot of I/O carrier

Wiring diagram

Figure: AS-Interface card wiring diagram