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Parameter and type
ID
OUT
LEN
OUT
TINFO
IN_OUT
AINFO
IN_OUT
Note
If you call "RALRM" in an OB whose start event is not an I/O interrupt, the instruction will
provide correspondingly reduced information in its outputs.
Make sure to use different instance DBs when you call "RALRM" in different OBs. If you
evaluate data resulting from a "RALRM" call outside of the associated interrupt OB, you
should use a separate instance DB per OB start event.
Note
The interface of the "RALRM" instruction is identical to the "RALRM" FB defined in
"PROFIBUS Guideline PROFIBUS Communication and Proxy Function Blocks according to
IEC 61131-3".
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
Data type
Description
HW_IO (Word)
Hardware identifier of the I/O module that caused the diagnostic
interrupt
Note: Refer to the F_ID parameter for an explanation of how to
determine the device ID.
DWord, UInt, UDInt,
Length of the received AINFO interrupt information
DInt, Real, LReal
Variant
Task information: Target range for OB start and management
information. The TINFO length is always 32 bytes.
Variant
Interrupt information: Target area for header information and additional
interrupt information. For AINFO, provide a length of at least the MLEN
bytes, if MLEN is greater than 0. The AINFO length is variable.
8.3 Distributed I/O (PROFINET, PROFIBUS, or AS-i)
Extended instructions
319
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