HEIDENHAIN PROFIBUS-DP (DPV2) - Manual (Page 54)

Acyclic parameter data
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7 Acyclic parameter data
7.1 Acyclic data exchange
In addition to the cyclic data exchange, the PROFIBUS encoder
also supports acyclic data exchange. The acyclic data exchange is
transferred over the non-real time channel and is used to read out
and write status information from and to the slave device. The
acyclic data exchange is conducted in parallel to the cyclic data
communication.
Example of acyclic data:
• Reading of diagnostic
• Reading of I&M functions
• Reading of PROFIdrive parameters
7.2 Identification and Maintenance (I&M functions)
Encoders according to the encoder profile 3.162 also support I&M
functionality. The main purpose of I&M functions is to support the
end user if the device is acting faulty or missing some of its
functionality. I&M functions could be seen as an electronic
nameplate containing common information regarding the device
and its manufacturer.
According to the PROFIBUS specification all IO-devices must at
least support the following I&M functions:
• Order ID
• Hardware Version
• Software Version
• Product type
• Manufacturer ID
For more information regarding additional I&M supported
functions refer to chapter 8.14.6.