nord NORDAC FLEX SK 2 E-111-123-A Series, Руководство пользователя

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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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