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How to deal with I&M data?

Overview

Identification & Maintenance (I&M) is an integral part of each Profinet PROFINET Device implementation. It provides standarized information about a device and its parts. The I&M Information is accessible through Profinet PROFINET Record Objects and is always bound to a submodule belonging to the item to be described. An item means here the Profinet PROFINET Device itself or a part of this device e.g. a plugable module for modular devices. Submodules can provide own I&M objects or share the I&M objects of other submodules. The I&M objects can be grouped into three kinds of information as described as follows.

I&M0 is a read only information which describes the associated item. The following fields are defined:

The I&M1 to I&M4 objects provide a non-volatile storage for Profinet Engineering PROFINET engineering-related information. This information is typically generated by the engineering software and stored within the objects at engineering time. The information must be stored by the device in non-volatile memory. The objects must be stored physically within the associated item. That This means in particular, if a plugable module is removed from one backplane and plugged into another backplane, it must deliver the same I&M1 to I&M4 information as stored before.

Finally, the I&M5 record provides information about the Profinet Protocol Implementation PROFINET protocol implementation itself. It is quite similar to I&M0 but describes the Prodifet Protocol Implementation PROFINET protocol implementation instead. Thus it is handled by the Profinet Protocol Implementation PROFINET protocol implementation itself.

Structure and access paths of I&M objects

The following picture illustrates figure shows the structural organization of I&M Records within a device and the access paths:

According I&M a submodule can be characterized as follows:

• The submodule is a representative for the module. That This means that the submodule provides the I&M information of the superordinate module.
• The submodule is a representative for the device. In that this case the submodule provides the I&M information of the superordinate device. Exactly one submodule of the device must have this property. Typicall the DAP submodule is choosen for that this purpose.

When reading the I&M objects of a submodule the following order is used to deliver the requested data:

1. If the submodule provides an own I&M0 object, the I&M read access will deliver the submodule's I&M objects
2. If the submodule has no own I&M0 object and the superordinate module has a module representative, the module representative's I&M objects will be delivered.
3. If the submodule has no own I&M0 object and the superordinate module has no representativ the device representatives's I&M objects will be delivered.

In contrast to thatthis, writing I&M1 to I&M4 objects is only possible on the submodules associated with the I&M objects itself.

Usage of I&M with Hilscher

PROFINET Protocol

The Profinet PROFINET Device Protocol Implementation protocol implementation of Hilscher supports two modes of operation with I&M. For simple applications the Profinet Protocol Implementation PROFINET protocol implementation provides I&M0 to I&M5 objects within the DAP submodule. In that this case the I&M is fully handled by the Profinet Protocol Implementation PROFINET protocol implementation without any interaction with the Application. If a more complex I&M structure is required, the Profinet Protocol Implementation PROFINET protocol implementation can forward I&M accesses to the Application. In that this case all I&M objects must be handled by the application. The desired mode of operation is configured using the Set Configuration Service.

If the Profinet Protocol Implementation is handling PROFINET protocol implementation is configured to handle the I&M internally, the following parameters will be used within the I&M0 object: