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.
Summary of Contents for NORDAC START Series
Page 1: ...BU 0135 en NORDAC START SK 135E SK 175E Users Manual for Motor Starters...
Page 4: ...NORDAC START SK 135E SK 175E Users Manual for Motor Starters 4 BU 0135 en 4118...
Page 111: ...8 Additional information BU 0135 en 4118 111 8 1 4 EU Declaration of Conformity...
Page 119: ...Key word index BU 0135 en 4118 119...
Page 120: ...6071302 4118...
