NORDAC SK 200E Manual
132
Subject to technical alterations BU
0200
GB
5.4 AS Interface
5.4.1
The bus system
The
A
ctuator -
S
ensor
Interface
(AS Interface) is a bus system for the lower field bus level. The transfer
principle is a single-master system with cyclical polling. Up to 31 standard slaves (or 62 A/B slaves in the
extended address range) can be operated on an unshielded two-wire cable up to 100m long and in any
network structure (tree / linear / star). For the AS Interface, since the
Complete Specification
V2.1 a
differentiation is made between standard and A/B slaves. Version V2.1 includes implements a doubling of
the number of slaves to 62. This is implemented by the double assignment of addresses 1-31 and the
designation "A slave" and "B slave". A/B slaves are labelled via the ID code and can therefore be uniquely
identified by the master.
NORD AS Interface modules are standard slaves.
The AS Interface cable (yellow) transfers data and energy. Addressing is carried out via the master, which
also provides further management functions, or via a separate addressing device. The 4-bit reference data
(in each direction) is transferred cyclically with an effective identification of errors and a cycle time of 5 ms.
The bus system is defined in the
AS Interface Complete Specification
.
The bus system is standardised as per EN 50295, IEC62026.
5.4.2
Features
The SK 225E and SK 235E 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 (Dip switches or parameters), 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)
•
Configuration optionally via integrated DIP switches and potentiometers or by parameterisation
•
Slave profile S-7.0 (4I / 4O)
•
24V supply of the integrated module and the frequency inverter via the yellow AS-i cable.
•
Connection to the frequency inverter via the terminal block.
•
Optional connection via M12 flange plug connector
•
Up to 31 frequency inverters on one bus conductor (standard slave (A-slave) technology)
•
Cycle
time
≤
5ms
•
Address as delivered = 0
•
Max. current consumption 290mA, of which 60mA are available for peripherals (initiators, connected
parameterisation tool, actuators).
The factory setting of the frequency inverter enables the immediate availability of common AS-i basic
functions. These functions can be adapted by parameterisation. For most common applications, DIP
switches are alternatively available of the frequency inverter for the selection of functions.
Summary of Contents for SK 200E Series
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