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To implement the communication, the following system installation components are available:
- AS‑i Master modules for central control units such as SIMATIC S7, ET 200M/ET 200SP distributed I/O, or routers from PROFIBUS or PROFINET to AS‑Interface
- AS‑i power supply unit or alternatively standard power supply unit in combination with an AS‑i data decoupling module for the power supply to the slaves and sensors
- AS-Interface shaped cables
- Network components such as repeaters and extension plugs (cannot be used for AS-i Power24V)
- I/O modules (AS‑i slaves) for connection of standard sensors/actuators
- Actuators and sensors with integrated AS-i slave
- Safe I/O modules (ASIsafe slaves) for transmitting safety-related data through AS‑Interface
- Addressing units for setting the slave addresses during commissioning
Example of a configuration with the system components:
Standard | IEC/EN 62026‑2 |
|---|---|
Topology | Line, star or tree structure (same as electrical wiring) |
Transmission medium | Unshielded twisted pair (2 x 1.5 mm2) for data and auxiliary power |
Maximum cable length
| 100 m without repeater 200 m with extension plug 300 m with two repeaters in series connection 600 m with extension plugs and two repeaters connected in parallel Larger cable lengths are also possible when additional repeaters are connected in parallel |
Maximum cycle time | 5 ms in full expansion with 31 standard addresses
10 ms in full expansion with 62 A/B addresses Profile-specific for slaves with extended data, e.g. analog slaves |
Number of stations per AS-Interface line
| Up to 62 slaves (A/B addressing)
integrated analog value transmission
|
Number of binary sensors and actuators | max. 496 DI / 496 DQ |
Access control
| Cyclic polling master/slave procedure
Cyclic data copying from host (PLC, PC) |
Error safeguard
| Identification and repetition of faulty message frames |
Siemens AS - Interface (AS-I)
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