Benefits; Operating Modes - Siemens SIRIUS 3RT Series System Manual

1.10.3.2

Benefits

An important characteristic of the AS-Interface technology is the use of a shared two-wire
cable for data transmission and distribution of auxiliary power to the sensors and actuators.
An AS-Interface power supply unit, which satisfies the requirements of the AS-Interface
transmission method, is used to distribute the auxiliary power. The AS-Interface cable is
mechanically coded, which prevents polarity reversal during wiring, and the insulation
displacement method allows for easy contacting.
Complex control cable wiring in the control cabinet and terminal blocks are replaced with AS-
Interface. Thanks to a specially developed cable and the insulation displacement method,
the AS-Interface cable can be connected anywhere. This concept is extremely flexible and
enables you to make huge savings.
1.10.3.3

Operating modes

In general, the following operating modes are distinguished between for the master
interfaces:
● I/O data exchange:
In this operating mode, the inputs and outputs of the binary AS-Interface slaves are read
and written to.
● Analog value transmission:
AS-Interface masters in accordance with AS-Interface Specification V2.1 or V3.0 support
integral analog value processing. This means that data can be exchanged using analog
AS-Interface slaves (in accordance with analog profile 7.3 or 7.4) just as easily as with
digital slaves.
● Command interface:
As well as I/O data exchange with binary and analog AS-Interface slaves, the AS-
Interface masters provide a range of other functions using the command interface. Thus,
for example, slave addresses can be allocated, parameter values can be transferred, or
diagnostics information can be read out from user programs.
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
1.10 Connection to the higher-level control
System overview
95