Siemens SIPROTEC PROFINET IO User Manual

2 PROFINET IO in SIPROTEC
2.6 Event List
44 SIPROTEC 4, Communication Module PROFINET IO, Communication Profile
C53000-L1840-C360-1, Edition 08.2012
2.6.3 Handshake Mechanism (Example)
In the following example of the event list handshake mechanism, the initial situation is defined as follows:
• 3 message blocks were last transmitted and acknowledged by the IO controller.
• The current message-block number is 14
dec
= E
hex
.
Figure 2-21 Handshake Mechanism (Example)
There is still one entry in the event list:
• Entry is taken from the event list in message
block #1 of the telegram
• Message blocks #2 and #3 complete = 0
• “Control _I” = F0
hex
(message block no. + 1)
• Current indications , measured values , metered
values are entered in cyclic telegrams
• Analysis of the cyclic indications, measured
values and metered values
• IO controller recognizes change in
“Control _I”: analysis of the message blocks
• “Control _O” = “Control _I” = F0
hex
• Send commands to SIPROTEC device in the
cyclic telegram, if applicable
IO device recognizes acknowledgment in
“Control _O”.
There are
no entries in the event list:
• “Control _I” remains = F0
hex
• Message blocks #1 to #3 complete = 0
• Current indications , measured values , metered
values are entered in cyclic telegrams
• Analysis of the cyclic indications, measured
values and metered values
• No actions reg. the message blocks because
no change of message block no .
• “Control _O” = “Control _I” = F0
hex
• Send commands to SIPROTEC device in the
cyclic telegram, if applicable
PROFINET IO
IO device IO controller
There are 4 new entries in the event list:
• The first 3 entries from the event list are taken
over into message blocks #1 to #3 of the
telegram
• “Control _I” = 10
hex
(message block no . + 1)
• Current indications , measured values , metered
values are entered in cyclic telegrams
• Analysis of the cyclic indications, measured
values and metered values
• IO controller recognizes change in
“Control _I”: analysis of the message blocks
• “Control _O” = “Control _I” = 10
hex
• Send commands to SIPROTEC device in the
cyclic telegram, if applicable
There are 2 entries in the event list (one “old” entry
of the 4 mentioned previously , plus a new one):
• Entries are taken over from the event list in
message blocks #1 and #2 of the telegram
• Message block #3 complete = 0
• “Control _I” = 20
hex
(message block no . + 1)
• Current indications , measured values , metered
values are entered in cyclic telegrams
......
......
NOTE
Several PROFINET IO bus cycles can lie between a new telegram from the IO device and the data analysis by
the IO controller (and vice versa), that is the arrows do not indicate a bus cycle but the direction of the higher-
level telegram exchange.
com_profinet-io_profile_us.book Page 44 Friday, August 17, 2012 1:40 PM

Siemens SIPROTEC PROFINET IO Specifications

General

Brand	Siemens
Model	SIPROTEC PROFINET IO
Category	Control Unit
Language	English