Restrictions - V2

Owned by Heinz Hentsch
Last updated: 2016-04-20 by Benjamin Meyer

Restrictions

  • The size of the bus configuration file is limited by the size of the RAM Disk (1 Megabyte)
  • The configuration database interface and its structure and definitions apply for netX products which use the PROFINET IO Controller - firmware only.
  • Structures and functions described in this document apply only to hardware from 3rd party vendors insofar as original Hilscher firmware is concerned. Therefore, whenever the term "netX firmware" is used throughout this manual it refers to ready-made firmware provided by Hilscher. Although 3rd party vendors are free to implement the same structures and functions in their product, no guarantee for compatibility of drivers etc. can be given.
  • The following limitations apply
    • The usable (minimum) cycle time depends on the number of used IO Devices, the number of used input and output data. The cycle-time, the number of configured IO-Devices and the amount of IO-data depend on each other. For example it is not possible due to performance reasons to have 128 IO-Devices communication with cycle-time 1ms.
    • RT over UDP not supported
    • Multicast communication not supported
    • DHCP is not supported (neither for PROFINET IO Controller nor for the IO-Devices)
    • Only one IOCR per IO-Device
    • NameOfStation of IO Controller CANNOT be set using the DCP SET NameOfStation service but only at start-up while configuring the IO Controller
    • The buffer for IO-Device diagnosis data will be overwritten in case of multiple diagnostic events. Only one (the last) event is stored at the same time. If a single event produces more than 200 bytes of diagnosis data (which is a really improbable situation), only the first 200 bytes will be taken care of.
    • WriteMultiple-Record service is not supported
  • Provider state in cyclic frames is set to "bad" until an application explicitly sets new input data
  • For compatibility reasons with some IO-Devices the firmware changes the gateway address of an IO-Device from 0.0.0.0 to the IO-Device’s IP-address. Both values have the meaning “No gateway” according to Profinet specification.
  • Features from Profinet specification v2.3 are not supported, thus IO Devices that do not support the so called "legacy startup" can not be connected to the IO Controller
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