Specifies attributes of a single DsFast.

 In every node where fast graphs should be stored there
 has to be a DsFast job to search through the local
 DsFast objects.

 The DsFastConf object is placed below the $Node object.
 If a Ds_Fast job is loaded to a node, which has no
 DsFastConf object, it will execute with 10 Hz.

 A Ds_Fast job has to be loaded and started in each
 node, where data for fast graphs should be stored.

• DsFast

 The frequency of the DsFast job in Hz.

 1 <= BaseFrequency <= 50.
 The BaseFrequency attribute in every DsFast object
 belonging to the same node as the DsFastConf are
 assigned the value of the attribute!

 Digital signals and pulse counter signals are handled
 in PLC programs which are working with different cycle
 times. This times are always an integer multiple of 20
 ms, which in the frequency plane means that only some
 discrete frequencies are allowed; e.g. 50 Hz, 25 Hz,
 ....
 Local analog signals are handled in a time specified by
 IOHandler.