Siemens SIPROTEC PROFINET IO User Manual

2 PROFINET IO in SIPROTEC
2.6 Event List
43SIPROTEC 4, Communication Module PROFINET IO, Communication Profile
C53000-L1840-C360-1, Edition 08.2012
2.6.2 Output Direction
The following structure corresponds to the IO module event list, data in output direction. The structure is not
used for process alarms.
Figure 2-20 Structure of the Event List, Output Direction (ACK)
Message-Block Number
The message-block number in the Control_O byte serves for reception acknowledgement and analysis of the
message block. After having analyzed the message blocks, the PROFINET IO controller copies the message-
block number of the Control_I byte of the input telegram to the Control_O byte of the output telegram.
The SIPROTEC device repeats the respective message block so often until the IO controller correctly mirrors
back the message-block number of the Control_I byte into the Control_O byte.
Control _O byte
Reserved = 0
Control _O byte
7 6 5 4 3 2 1 0
Message-block
number
Reserved = 0
Bit position
Meaning
com_profinet-io_profile_us.book Page 43 Friday, August 17, 2012 1:40 PM

Siemens SIPROTEC PROFINET IO Specifications

General

Brand	Siemens
Model	SIPROTEC PROFINET IO
Category	Control Unit
Language	English