4 Commissioning
BU 0200 en-3118 119
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4.5 AS Interface (AS-i)
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This section is only relevant for device of type SK 22xE / SK 23xE.
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4.5.1 The bus system
General information
The Actuator-Sensor-Interface (AS interface) is a bus system for the lower field bus level. It is fully
defined in the AS interface Complete Specification and standardised as per EN 50295, IEC62026.
The transmission principle is a single master system with cyclical polling. Since Complete
Specification V2.1, a maximum of 31 standard slaves which use device profile S-7.0. or 62 A/B
slaves that use device profile S-7.A. can be operated on a non-shielded two-wire cable up to 100 m in
length with any network structure.
The number of possible slave subscribers can be doubled by means of double assignment of
addresses 1-31 and designation "A Slave" or "B Slave". A/B Slaves are designated by the ID code A,
and therefore can be uniquely identified by the Master.
Devices with slave profiles S-7.0 and S-7.A can be jointly operated within an AS-i network as of
version 2.1 (Master profile M4) with observance of the allocation of addresses (see example).
Permissible Not permissible
Standard slave 1 (Address 6) Standard slave 1 (Address 6)
Standard slave 2 (Address 7)
Standard slave 2 (Address 8)
Standard slave 3 (Address 8)
Addressing is implemented via the master, which can also provide other management functions, or via
a separate addressing device.
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Device-specific information
The transfer of the 4-bit reference data (in each direction) is performed with effective error protection
for standard slaves with a maximum cycle time of 5 ms. Due to the correspondingly higher number of
participants, for A/B slaves the cycle time (max. 10 ms) is doubled for data which is sent from the
slave to the master. Extended addressing procedures for the transmission of data to the slave also
cause an additional doubling of the cycle time to max. 21 ms.
The yellow AS interface cable supplies data and energy.
Pos: 26 3.4 /A nleitu ngen/ Elektr onik /FU und St art er/4. In betri ebnah me/AS-I nt erf ace [ all e G erät e]/ Das Buss ys tem _03 [SK 2xx E] @ 9\mod_1443513330901_388.docx @ 247240 @ @ 1
With special devices SK 2x5E-…-AUX and …-AXB, the connection of another two-wire lead (black)
is required for connecting an auxiliary voltage (24 V DC). When doing this it is not strictly necessary to
provide the supply via a protective extra-low voltage (PELV - Protective Extra Low Voltage), but this is
recommended.
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