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Using the data record interface
7.1
Data record interface of the AS-i master CM 1243-2
Meaning and function
With the help of the data record interface, you can completely control the response of the
AS-i master via your user program.
AS-i calls are read and written via the acyclic services. In the user program of the
CPU S7-1200 you can use the blocks "RDREC" (SFB 52, read data record) and "WRREC"
(SFB 53, write data record) for this purpose - see the following table.
Calls
The following blocks are used for reading and writing data records:
Table 7- 1
Call
Read data record
Write data record
You will find these blocks in STEP 7 in the operations list under "Advanced operations,
distributed I/O"
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
Blocks for reading and writing data records
In SIMATIC S7
RDREC (SFB 52)
WRREC (SFB 53)
7
55
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