Distributed I/O (Profinet, Profibus, Or As-I); Distributed I/O Instructions - Siemens S7-1200 System Manual

Extended instructions

8.3 Distributed I/O (PROFINET, PROFIBUS, or AS-i)

8.3 Distributed I/O (PROFINET, PROFIBUS, or AS-i)
8.3.1

Distributed I/O Instructions

The following Distributed I/O instructions can be used with PROFINET, PROFIBUS, or AS-i:
● RDREC instruction (Page 315): You can read a data record with the number INDEX from
a module or device.
● WRREC instruction (Page 315): You can transfer a data record with the number INDEX
to a module or device defined by ID.
● RALRM instruction (Page 318): You can receive an interrupt with all corresponding
information from a module or device and supply this information to its output parameters.
● DPRD_DAT instruction (Page 326): You must read consistent data areas greater than
64 bytes from a module or device with the DPRD_DAT instruction.
● DPWR_DAT instruction (Page 326): You must write consistent data areas greater than
64 bytes to a module or device with the DPWR_DAT instruction.
The DPNRM_DG instruction (Page 328) can only be used with PROFIBUS. You can read
the current diagnostic data of a DP slave in the format specified by EN 50 170 Volume 2,
PROFIBUS.
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S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG