Scope of AS-Interface Specification V3.0

Basic data

• AS-Interface Specification 3.0 describes a fieldbus system with an AS-i master and up to 62 AS-i slaves.
• The standard slaves continue to occupy one AS-i address (1...31).
• Slaves with extended addressing divide an address into an A address (1A...31A) and a B address (1B...31B). Up to 62 A/B slaves can be connected accordingly to one AS-Interface network.
• Mixed operation of standard slaves and A/B slaves is possible without difficulty. The AS-i master identifies automatically which type of slave is connected. No special adjustments are required of the user.
• One digital AS‑i slave typically has up to four digital inputs and four digital outputs.
• The transfer of the digital input/output data takes a maximum cycle time of 5 ms for 31 slaves, additional values see "Communication cycle".
• Integrated analog value transmission permits access to both analog values and digital values without the need for any special function blocks.

Communication cycle

Each address is queried in up to 5 ms cycle time. If two A/B slaves are operated on one basic address (e.g. 12A and 12B), a maximum of 10 ms will be required for updating the data of both slaves.

All slave types can be mixed and used on a single AS-Interface network.

For more information, for example, to find out whether an AS-Interface slave is a standard or A/B slave, see "Selection and ordering data" of the relevant slave.

Available masters with the latest AS-Interface specification V3.0

• CM AS‑i Master ST, F-CM AS-i Safety ST (ET 200SP)
• CM 1243-2 (S7‑1200)
• CP 343‑2, CP 343‑2P (S7‑300 / ET 200M)
• IE/AS‑i Link PN IO
• DP/AS‑i Link Advanced
• DP/AS-Interface Link 20E