NORD Drivesystems BU0180 - Manual (Page 70)

SK 180E Manual for frequency inverters
70 Pre-series version BU 0180 GB-0914
5.4 AS interface (only SK 190E)
5.4.1 The bus system
The ActuatorSensor Interface (AS-Interface) is a bus system for the lower field bus level. The transmission
principle is a single master system with cyclical polling. A maximum of 31 slaves (or 62 A/B slaves in the
extended address region) can be operated on an up to 100m long unshielded two-wire cable in any network
structure (tree/line/star). For the AS-interface, since the Complete Specification V2.1, a differentiation has
been made between Standard Slaves and A/B Slaves. This version includes the doubling of the number of
slaves to 62. This is done by the double-assignment of addresses 1-31 and their designation as "A Slave"
and "B Slave". A/B Slaves are designated by the ID code A, and therefore can be uniquely identified by the
Master.
The SK 190E frequency inverter is an A/B slave, which corresponds to slave profile S-7.A. They can be
administered by masters whose profile at least corresponds to class M4.
In contrast to devices with the profile S-7.0 devices with the profile S-7.A use the extended address range.
Devices with slave profiles S-7.0 and S-7.A can be jointly operated within an ASi network as of version 2.1
(Master profile M4) with observance of the allocation of addresses (see example).
The yellow AS interface cable supplies data and energy. Addressing is implemented via the master, which
can also provide other management functions, or via a separate addressing device. 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 5ms. Due to the correspondingly higher number of participants, for A/B slaves the
cycle time (max. 10ms) 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. 21ms.
The bus system is completely defined in the AS-Interface Complete Specification and is standardised as per
EN 50295, IEC62026.
5.4.2 Features
The SK 190E frequency inverter versions provide an integrated AS interface as standard. Therefore, these
devices can be directly integrated into an AS interface network. Only the adaptation of various frequency
inverter functions, addressing and the correct connection of the power supply, BUS, sensor and actuator
cables needs to be carried out.
Features

Electrically isolated bus interface

Status display (1 LED) inside the device (can be viewed with the cover open)

Configuration by parameterisation

Slave profile S-7.A (4I / 4O), (A/B Slave)

Connection of the frequency inverter via the terminal bar, optionally via M12 flanged plug connector

Up to 31 standard slave (or 62 A/B slaves in the extended address region) on one bus conductor

Cycle time ≤ 5 ms / 10 ms (A/B)

Address as delivered = 0

Max. current consumption: 25 mA
The factory setting of the frequency inverter enables the immediate availability of common AS-i basic
functions. These functions can be adapted by parameterisation.
Permissible
Standard slave 1 (Address 6)
A/B-Slave 1: (Address 7A)
A/B-Slave 2: (Address 7B)
Standard slave 2 (Address 8)
Not permissible
Standard slave 1 (Address 6)
Standard slave 2: (Address 7)
A/B-Slave 1: (Address 7B)
Standard slave 3 (Address 8)