Table of Contents
Advertisement
7.2.2.9
Change AS-i slave address (Change_Slave_Address)
Meaning
This call can be used to change the AS-i address of an AS-i slave.
This call is used predominantly for adding a new AS-i slave with the default address "0" to
the AS-Interface. In this case, the address is changed from the "AS-i slave address, old"
(= 0) to the "AS-i slave address, new".
The change is only executed if the following conditions are met:
1. An AS-i slave with the "AS-i slave address, old" must exist.
2. When changing the AS-i slave address, the address is initially set to "0". No other slave
with the address "0" may be connected.
3. "AS-i slave address, new" must have a valid value.
4. An AS-i slave with "AS-i slave address, new" must not already exist.
Structure of the utility WRREC − Index 20
Byte
Bit 7
0
1
2
3
To address slaves with a "B" address, you must add the value "32" to the AS-i address.
Example: The AS-i slave with address "1B" must be changed to address "2B". In this case,
the value "33" must be transferred as "AS-i address old" and the value "34" as "AS-i address
new".
AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200
Manual, 04/2013, A5E02655230010A/RS-AA/003
Bit 6
Bit 5
7.2 Description of the AS-i line calls and AS-i slave calls
Meaning
Bit 4
Bit 3
Version_hi = 0x00
Version_lo = 0x00
AS-i address old
AS-i address new
Using the data record interface
Bit 2
Bit 1
Bit 0
75
Advertisement
Table of Contents
