User Manual

Easy to communicate between devices
7.7 AS-i
Easy Book
148 Manual, 03/2014, A5E02486774-AF
Parameter
Description
Transmission rate Transmission rate of the configured PROFIBUS network: The PROFIBUS
transmission rates range from 9.6 Kbits/sec to 12 Mbits/sec. The
transmission rate setting depends on the properties of the PROFIBUS
nodes being used. The transmission rate should not be greater than the
rate supported by the slowest node.
The transmission rate is normally set for the master on the PROFIBUS
network, with all DP slaves automatically using that same transmission rate
(auto-baud).
7.7
AS-i
The S7-1200 AS-i master CM 1243-2 allows the attachment of an AS-i network to an S7-
1200 CPU.
The actuator/sensor interface, or AS-i, is a single master network connection system for the
lowest level in automation systems. The CM 1243-2 serves as the AS-i master for the
network. Using a single AS-i cable, sensors and actuators (AS-i slave devices) can be
connected to the CPU through the CM 1243-2. The CM 1243-2 handles all AS-i network
coordination and relays data and status information from the actuators and sensors to the
CPU through the I/O addresses assigned to the CM 1243-2. You can access binary or
analog values depending on the slave type. The AS-i slaves are the input and output
channels of the AS-i system and are only active when called by the CM 1243-2.
In the figure below, the S7-1200 is an AS-i master controlling AS-i operator panel and I/O
module digital/analog slave devices.