Read() - Native C - Siemens Simatic S7-1500 Function Manual
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User interfaces (API)
7.6 API IInstances
Read()
Reads the value of a PLC tag.
Table 7- 162 Read() - Native C++
Syntax
Parameters
Return values
174
ERuntimeErrorCode Read(
WCHAR* in_Tag,
SDataValue* inout_Value
);
•
WCHAR* in_Tag:
The name of the PLC tag that is to be read.
•
SDataValue* inout_Value:
Contains the value and the expected type of the PLC tag. If the expected type
is
, it is set to the stored type when the function was successful.
UNSPECIFIC
The
type is not supported.
STRUCT
Structures and fields can be emulated through signal lists and be read by using
the
function.
ReadSignals()
Runtime error code
SREC_OK
SREC_INTERFACE_REMOVED
SREC_TIMEOUT
SREC_INSTANCE_NOT_RUNNING
SREC_DOES_NOT_EXIST
SREC_NOT_SUPPORTED
SREC_TYPE_MISMATCH
SREC_NOT_UP_TO_DATE
Condition
The function is successful.
The instance is not registered in Runtime
Manager.
The function does not return on time.
The process of the virtual controller is not
running.
The entry does not exist in the stored tag
list.
Access to entire structures or arrays is
not supported.
The expected type does not match the
stored type. See Compatible primitive
data types (Page 335).
The stored tag list must be updated.
S7-PLCSIM Advanced
Function Manual, 12/2017, A5E37039512-AB
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