Non-Cyclic Data; What Is Non-Cyclic Data; Configuration Using Non-Cyclic Data; Profibus Dp-V1 Compatibility - Leroy-Somer digitax st User Manual

8

Non-cyclic data

8.1

What is non-cyclic data?

Non-cyclic data allows access to any parameter without the need to use cyclic data
transfers. This is particularly useful when accessing many different parameters for set-
up or archiving of drive settings. There are three methods of using non-cyclic data on
the SM-PROFIBUS DP-V1:
• DP-V1 Parameter Access
• Mode 1 - CT Single Word
• Mode 2 - PPO 4 Word
8.1.1 DP-V1 Parameter Access
Non-cyclic data is transmitted after all the cyclic data within the PROFIBUS-DP cycle,
depending on the length of the non-cyclic data, this may take several cycles to
complete.
8.1.2 Mode1 - CT Single Word
This mode uses an additional data word to implement the CT Single Word protocol,
allowing access any drive parameter. See section 8.6 Mode 1 - CT Single Word
mode for more information.
8.1.3 Mode 2 - PPO 4 Word
This mode uses four data words to access any drive parameter. See section 8.8 Mode 2
- PPO 4 Word mode for more information.
8.2

Configuration using non-cyclic data

The SM-PROFIBUS DP-V1 can be configured using the DP-V1 Parameter Access
channel, CT Single Word or PPO 4 Word non-cyclic data. This is useful when using a
master controller to configure the drive; when a drive is initialized only the node
address MM.03 and the data mode MM.05, need to be set manually. The master can
now use the desired mode to setup the remainder of the parameters.
The configuration parameters for the slot in which the SM-PROFIBUS DP-V1 is located
can be accessed as Pr 60.PP. Any changes made to the configuration parameters will
not take effect until the SM-PROFIBUS DP-V1 has been reset. SM-PROFIBUS DP-V1
can be reset by writing a value of 1 to Pr 60.32. A brief interruption in PROFIBUS-DP
communications may be seen while the reset sequence is in progress.
8.3

PROFIBUS DP-V1 Compatibility

The additional features that PROFIBUS DP-V1 provide are only available on drives
fitted with SM-PROFIBUS DP-V1, with firmware V03.02.00 or later.
When network compatibility mode (Pr MM.41) is set to a non-zero value, DP-V1
NOTE
functionality is disabled.
In order to use the DP-V1 features, the appropriate DP-V1 GSD file must be installed in
NOTE
the master PLC.
SM-PROFIBUS DP-V1 User Guide
Issue : a www.leroy-somer.com
29