1-3
C7-621 / C7-621 AS-i Control Systems
C79000-G7076-C622-01
1.2 C7 AS-i CP in the C7-621 AS-i
The AS interface or actuator-sensor interface is a communication system for
binary sensors and actuators at the lowest field level. Process signals
generated in the field are normally transferred to the controller using a large
amount of parallel wiring and input/output modules. This means that every
sensor or actuator in the field is connected to the input/output modules with
its own separate cable.
With the AS interface, this cable harness can be replaced by a simple
common 2-wire cable for all sensors and actuators.
The technical data and ordering information for AS-i actuators and sensors is
listed in the Siemens Catalog ST PI.
The main characteristics of the AS-i system are as follows:
S Master-slave access technique
S Electronic address setting
S Operating reliability and flexibility
S 2-wire cable (unshielded) for data and power supply
S Tree configuration with cable lengths up to 100 m
S Direct integration
S Increased functionality, greater use for the customer
S Additional power supply when more power is required
S Cycle time maximum 5 ms with 31 slaves
S Maximum of 31 slaves
S Maximum of 248 binary I/Os (124 inputs, 124 outputs)
The AS-i CP supports two types of operation:
Standard Operation
Standard operation allows particularly simple installation and programming
of the C7 AS-i CP.
In standard operation, the C7 AS-i CP behaves like an I/O module. It
occupies 16 input and 16 output bytes in the analog area of the controller. In
this operation, the slaves are assigned the default value for the parameters
(F
H
) saved on the CP. Parameters and commands cannot be transferred in
standard operation.
Overview
How the C7 AS-i
CP Functions
Numeric Data
C7 AS-i CP Modes
Introduction
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