Nord Drivesystems NORDAC LINK SK250E-FDS, Руководство пользователя

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NORDAC LINK (SK 250E-FDS ... SK 280E-FDS) – Users Manual for Frequency Inverters as Field Distributors
68 BU 0250 en-3021
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4.5 AS Interface (AS-i)
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This section is only relevant for device of type SK 270E-FDS / SK 280E-FDS.
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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 has been
defined in the AS-Interface
Complete Specification
and standardised according to EN 50295,
IEC62026.
The transfer principle is a single-master system with cyclic polling. Since the
Complete Specification
V2.1
, a maximum of 31 standard slaves using the device profile S-7.0. , or 62 slaves in the
extended addressing mode using the device profile S-7.A. could have been operated with any
network structure at an unshielded two-wire line up to 100 m long.
Doubling the number of possible slave participants is realised by the double assignment of the
addresses 1-31 and the “A slave” or “B slave” labelling. Slaves in the extended addressing mode are
labelled by the ID code A and can be clearly identified by the master.
Devices with slave profiles S-7.0 and S-7.A. can be operated together within an AS-i network with
version 2.1 and higher ( master profile M4 ), considering the address assignment (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 done via the master that also provides further management functions, or via a separate
addressing unit.
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Device-specific information
The transfer of the 4-bit application data (per 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 the extended addressing mode, the cycle time is doubled (
max. 10 ms
) for data sent
from the
slave to the master
. Extended addressing for sending data
to the slave
cause an additional doubling of
the cycle time to
max. 21 ms
.
The AS-Interface cable (yellow) transfers data and power.
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It can supply for both the total need of control voltage (including control voltage for the device and any
connected sensors) and only the AS-Interface.
The supply of the device and any connected sensors can also be effected via an internal power supply
unit (“
-HVS ” option), via the “black two-wire line” (only possible with plug connector option: “ -AUX ” or
“ -AXS ” on option slot M8 ), or via a combination of both.
For the “ -AUX ” or “ -AXS ” option, the power supply unit (“ -HVS ” option) takes over a load-reducing
power supply function. For the “ -ASI ” and “ -ASS ” options, it depends on the AS-i supply voltage level.
Therefore, a load reduction cannot be assumed in each case.
“ -AUX ” or “ -AXS ” option (option slot M8 ): It is recommended, but not mandatory to effect the supply
via P rotective E xtra L ow V oltage ( PELV ).
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