Agent object for a Hilscher cifX board with Profnet controller
 firmware.

 The object is configured as a child to the node object.
 The devices on the Profinet bus are configured as children to
 the PnController object. These object should be of class PnDevice
 or of a subclass of PnDevice. The devices are configured with the
 Profinet configurator.

 The Alias attribute has to correspond to the alias setting for the
 driver configuration for the board in the device.conf file.

• PnDevice

Optional description.

Specification of the board.

Datasheet URL.

IP address for the controller.

Subnet mask for the controller.

Device name for controller.

Device type.

The alias attribute is used to identify the board.
It should correspond to the alias setting in the device.conf file.

Channel. Only channel 0 is implemented.

Controller status.
The status is displayed in decimal form and has to be converted
to hexadecimal form to be identified in the cifX manual.
A description is dislayed in the ErrorStr attribute.
0 is sucess status.

Process that handles the module.

1: The module is read by the plc process, and is handled by a specific
   thread in the plc, which is specified in the ThreadObject attribute.
2: The module is read by the rt_io_comm process.
4: The module is handled by an application program.

The PlcThread object of the plc thread that handles the card.
The card is read with the scantime of the thread.

Error counter, incremented for every failed read or write operation of the card.
When the error counter reaches ErrorSoftLimit, a message is sent to the console log.
When it reaches ErrorHardLimit, all IO handling is aborted.

Text string for an error status.

Value of the error counter, when a message is sent to the console log.

Value of the error counter, when all IO handling is aborted.

Diagnosis data.