103BCommunication
10.4 AS-i
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
455
Table 10- 43 Parameters for the AS-i address
Parameter
Description
Subnet
Name of the Subnet to which the device is connected.
Address
Assigned AS-i address for the slave device in range of 1(A or B) to 31(A or
B) for a total of up to 62 slave devices
Parameters
Transmission rate
Transmission rate of the configured AS-i network is 10 ms.
10.4.2
Exchanging data between the user program and AS-i slaves
10.4.2.1
Configuring slaves with STEP 7
Transferring AS-i digital values
The CPU accesses the digital inputs and outputs of the AS-i slaves through the CM 1243-2
AS-i master in cyclic operation. The data is accessed through I/O addresses or by means of
a data record transfer.
A 62-byte data area is reserved in the I/O area of the SIMATIC. Access to the digital data is
performed here in bytes (in other words, one byte is assigned to each AS-i digital slave).
When you configure the AS-i slaves in STEP 7, the I/O address for accessing the data from
the user program is displayed in the inspection window for the respective AS-i slave.