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TS1981N56E19

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data) instructions with PROFINET and PROFIBUSUse the DPRD_DAT instruction to read the consistent
data of a DP standard slave/PROFINET IO device. If no
errors occur during the data transfer, the data read is
entered into the target area set up by the RECORD
parameter. The target area must have the same length as
you configured with STEP 7 for the selected module.
When you call the DPRD_DAT instruction, you can only
access the data of one module / DP identification under
the configured start address.
ret_val := DPWR_DAT(
laddr:=_word_in_,
record:=_variant_in_);
Use the DPWR_DAT instruction to transfer the data in
RECORD consistently to the addressed DP standard
slave/PROFINET IO device. The source area must have
the same length as you configured with STEP 7 for the
selected module.
The CPU supports up to 64 bytes of consistent data. For consistent data areas greater than
64 bytes, the DPRD_DAT and DPWR_DAT instructions must be used. If required, these
instructions can be used for data areas of 1 byte or greater. If access is rejected, error code
W#16#8090 will result.
Note
If you are using the DPRD_DAT and DPWR_DAT instructions with consistent data, you must
remove this consistent data from the process-image automatic update. Refer to "PLC
concepts: Execution of the user program" (Page 67) for more information.
Table 8- 79 Data types for the parameters
Parameter and type Data type Description
LADDR IN HW_IO (Word)  Configured start address from the "I" area of the module from which
the data will be read (DPRD_DAT)
 Configured start address from the process image output area of the
module to which the data will be written (DPWR_DAT)
Addresses have to be entered in hexadecimal format (for example, an
input or output address of 100 means: LADDR:=W#16#64).
RECORD OUT Variant Destination area for the user data that were read (DPRD_DAT) or source
area for the user data to be written (DPWR_DAT). This must be exactly
as large as you configured for the selected module with STEP 7. Only the
data type Byte is permitted.
RET_VAL OUT Int If an error occurs while the function is active, the return value contains an
error code. perations
The destination area must have the same length as configured for the selected module with
STEP 7. If no error occurs during the data transfer, the data that have been read are entered
into the destination area identified by RECORD.
If you read from a DP standard slave with a modular design or with several DP identifiers,
you can only access the data of one module/DP identifier for each DPRD_DAT instruction
call, specifying the configured start address.
DPWR_DAT operations
You transfer the data in RECORD consistently to the addressed DP standard
slave/PROFINET IO. The data is transferred synchronously, that is, the write process is
completed when the instruction is completed.
The source area must have the same length as you configured for the selected module with
STEP 7.
If the DP standard slave has a modular design, you can only access one module of the DP
slave. No error occurred
808x System error with external DP interface module
8090 One of the following cases apply:
 You have not configured a module for the specified logical base address.
 You have ignored the restriction concerning the length of consistent data.