4 Commissioning
BU 0135 en-4118
69
4.3 AS Interface (AS-i)
This section is only relevant for device of type SK 175E-...-ASI.
4.3.1 The bus system
General information
The
A
ctuator-
S
ensor-
I
nterface (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)
A/B slave 1 (Address 7A)
Standard slave 2 (Address 7)
A/B slave 2 (Address 7B)
A/B slave 1 (Address 7B)
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.
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.
The motor starter is configured in such a way that no additional auxiliary voltage has to be connected.
However, by adapting a jumper it is possible to configure the motor starter in such a way that the
yellow AS-i cable is only used for data transmission and supplies the AS-i bus. The device itself and
sensors and the like that are connected via the device are then provided with an auxiliary voltage
(24 V DC) by a
second two-wire cable (black)
. When doing this it is
essential
to provide the supply
via a protective low voltage (
PELV
-
P
rotective
E
xtra
L
ow
V
oltage).
4.3.2 Features and technical data
The device can be directly integrated in an AS interface network is parametrised in its factory settings
so that the most frequently used AS-i functionality is available immediately. Only adaptations for
application-specific functions of the device or the bus system, the addressing and proper connection of
the supply, BUS, sensor and actuator cables need to be carried out.
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