S7 Communication; Get And Put Instructions - Siemens SIMATIC S7 System Manual

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103BCommunication

10.5 S7 communication

Configuration error

When the yellow "CER" LED is ON, there is an error in the AS-i slave device configuration.

Select the "ACTUAL > EXPECTED" button to overwrite the CM 1243-2 AS-i master module

slave device configuration with the AS-i field network slave device configuration.

S7 communication

You can use the GET and PUT instructions to communicate with S7 CPUs through

PROFINET and PROFIBUS connections.

● Accessing data in an S7-300/400 CPU: An S7-1200 CPU can use either absolute

● Accessing data in a standard DB: An S7-1200 CPU can use either absolute addresses or

● Accessing data in an optimized DB: An S7-1200 CPU can only use symbolic names to

addresses or symbolic names to address variables of an S7-300/400 CPU. Data types of

the remote communication partner that are not supported by the calling S7 1200-CPU

may only be accessed as a byte array. For example, S7-300 data type DT is accessed as

an array of 8 bytes.

symbolic names to address DB variables in a standard DB of a remote S7 CPU.

address DB variables in an optimized DB of a remote S7 CPU. Only variables of the first

nesting level are supported. This includes variables which are declared in an optimized

global DB at the DB level. Components of optimized DB structures or elements of arrays

cannot be addressed.

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

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