103BCommunication
10.5 S7 communication
S7-1200 Programmable controller
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System Manual, 11/2011, A5E02486680-05
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.
10.5
S7 communication
10.5.1
GET and PUT instructions
You can use the GET and PUT instructions to communicate with S7 CPUs through
PROFINET and PROFIBUS connections.
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Accessing data in an S7-300/400 CPU: An S7-1200 CPU can use either absolute
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.
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Accessing data in a standard DB: An S7-1200 CPU can use either absolute addresses or
symbolic names to address DB variables in a standard DB of a remote S7 CPU.
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Accessing data in an optimized DB: An S7-1200 CPU can only use symbolic names to
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.
