HMS Networks Anybus CompactCom 40 Network Manual page 111

Sync Object (EEh)
11.5.5. Anybus CompactCom Sync and PROFINET Isochronous Mode
The sync functionality is described differently in the PROFINET network specification than how it is described in
the specification for Anybus CompactCom in general. See the Anybus CompactCom 40 Software Design Guide for
a detailed description of the Anybus CompactCom sync functionality.
This section describes the correlation between the specifications.
The figure below shows a timing diagram for PROFINET isochronous mode.
Controller Application Cycle (CACF=1)
IO controller
Network
Input
Data
Output
Data
IO device
T_IO_Input
1 2
Figure 6.
T_IO_OutputMin
T_IO_OutputMin consists of two delays:
• The delay added by the Anybus CompactCom. This is the time from when the message is available on the
network until it is available to the application. This delay is 0 in the current implementation.
• The delay added by the application. This is the time it takes for the application from when it is notified
that new process data has arrived, to when the process data is copied and the output is valid. This delay
must be measured by the application designer. The measured value shall be written to Attribute #4 (Output
Processing).
The value of T_IO_OutputMin must be entered in the GSD file for every submodule supporting synchronous
operation. See example GSD entries below.
SCM-1202-021 Version 2.6
Anybus
Application Background
Input
Data
Output
Data
T_IO_Output
T_DC
3
® ™
CompactCom 40 - PROFINET IRT Transparent
1: T_IO_InputMin
4 2: T_IO_InputValid
3: T_IO_OutputValid
4: T_IO_OutputMin
Ethernet
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