NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
120
BU 0200 en-US-4920
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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
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 standardized 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 slaves in
an extended addressing mode
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". Slaves in extended addressing mode 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.
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Specific information for the variable frequency drive
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 higher number or participants, for
slaves in extended addressing mode, the cycle time is doubled (
max. 10 ms
) for data sent
from the
slave to the master
. Extended addressing procedures for the transmission of data
to the slave
cause
an additional doubling of the cycle time to
max. 21 ms
.
The yellow AS interface cable supplies data and energy.
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With special devices
SK 2x5E-…-AUX
and
…-AXB
, the connection of
another two-wire lead (black)
is needed to connect 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
-
P
rotective
E
xtra
L
ow
V
oltage) but this is
recommended.
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