Program Blocks For Fdl - Siemens S7-1500 PROFIBUS Operating Instructions Manual

Configuration, program blocks

3.6 Program blocks for FDL

System blocks and
system functions
SETIO
GETIO_PART
SETIO_PART
D_ACT_DP
DPRD_DAT
DPWR_DAT
RALRM
Refer to the documentation of the program blocks in the information system of STEP 7.
Calling program blocks (instructions) for distributed I/O
Several calls are necessary for the instructions of the distributed I/O.
The time required to process the job depends on load, round-trip time and transmission
speed. If these instructions are called in a loop within one cycle, the cycle time could be
exceeded.
Exception: Only one call is required for RALRM "receive alarm".
Program blocks for DPV1 according to the PNO standard (PROFIBUS user organization):
• RDREC
"Read data record from a DP slave" corresponds to SFC59 in terms of function
• WRREC
"Write data record to a DP slave" corresponds to SFC58 in terms of function
• RALRM
"Read interrupt information from a DP slave" - call in an interrupt OB
3.6 Program blocks for FDL
Program blocks of Open User Communication (OUC) for FDL
To use the bus access protocol FDL (Fieldbus Data Link) use the program blocks of Open User
Communication (OUC). For this, create a suitable program blocks. You will find details on the
program blocks in the information system of STEP 7.
The end point of an FDL connection is an S7-1500 CPU with communications module
CM 1542-5. For the required firmware versions of the modules, see section Program blocks
(Page 17).
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Meaning when used with CM
Transferring the process image of a DP standard slave
Reading the process image partition of a DP standard slave
Transferring the process image partition of a DP standard slave
Disable / enable DP slaves
Reading consistent data of a DP standard slave (user data)
Writing consistent data of a DP standard slave
Event-driven reading of interrupt information (diagnostics, pull/plug,
hardware interrupt) and DPV1-specific interrupts (update, status, vendor-
specific interrupt)
Operating Instructions, 01/2023, C79000-G8976-C290-07
SIMATIC CM 1542-5