NORD Drivesystems BU0090 - Manual (Page 7)

1 Introduction
BU 0090 GB 7
1 Introduction
1.1 General information
This AS Interface documentation is valid for the NORDAC SK 300E, SK 500E, SK 700E series and for
SK 750E.
NORDAC frequency inverters can be equipped with various modules for parameterisation or control. A slot
is provided for this in the basic device. As delivered, there is a blank cover at this location, which must be
replaced by the DeviceNet technology unit.
1.2 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.
NORD AS Interface Modules type SK TUx-AS1 are standard slaves which correspond to the slave profile
S-7.4
. They can be administered by masters whose profile at least corresponds to class M4 (in some cases
M3 is sufficient).
NORD AS Interface Modules type SK TUx-AS3 are standard slaves which correspond to the slave profile
S-7.A
. They can be administered by masters whose profile at least corresponds to class M4.
The S-7.4 profile describes the function for the transfer of bit strings and the bi-directional data
communication. Modules with profile S-7.A (SK TUx-AS3) use the extended address range, however
transfer of strings is not possible.
Type SK TUx-AS1 and -AS3 modules 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 AS interface cable (yellow) transmits data and energy while a second two-wire cable (black) can be
used for a low auxiliary voltage (24V). 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 the correspondingly high 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, IEC62026t.
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)