Exchanging Data Between The User Program And As-I Slaves; Step 7 Basic Configuration - Siemens S7-1200 System Manual

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Communication

Exchanging data between the user program and AS-i slaves

The AS-i master reserves a 62-byte data area in the I/O area of the CPU. Access to the

digital data is performed here in bytes; for each slave, there is one byte of input and one byte

of output data.

The assignment of the AS-i connections of the AS-i digital slaves to the data bits of the

assigned byte is indicated in the inspection window of the AS-i master CM 1243-2.

You can access the data of the AS-i slaves in the user program by using the displayed I/O

addresses with the appropriate bit logic operations (for example, "AND") or bit assignments.

"System assignment" is automatically activated if you do not configure the AS-i slaves with

If you do not configure any slaves, you must inform the AS-i master CM1243-2 about the

actual bus configuration using the online function "ACTUAL > EXPECTED".

Further information

You can find detailed information on the AS-i master CM 1243-2 in the "AS-i master CM

1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200" Manual

(http://support.automation.siemens.com/WW/view/en/50414115/133300).

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG