User guide

Example

The IfOperStatus.1 variable determines the operating state (up, down) of Port 1

6 Important Information and Limitations

6.1 Number of PNIO Devices

The current implementation of the system adaptation only permits one device instance. Multidevice functionality is

not currently implemented in the system adaptation.

6.2 Parameters for One Device

• For the current implementation, 32 modules (slots) with up to 8 subslots were tested and released.

• Maximum module size: 254 bytes

• Isochronous cycle time: 1 to 4 ms in increments of 250 µs

6.3 Maximum Number of User Data for One Device

The maximum number of process data for IRT is determined by the maximum message frame size (1,434 bytes

net) and the number of PhysicalSlots (parameters in the GSDML file). The maximum data length in bytes

(attributes MaxInputLength and MaxOutputLength in the GSDML file) is 1,434 bytes of data minus 2 times the

number of PhysicalSlots.

Example for one IO device with 16 PhysicalSlots: 1,402 bytes of maximum user data

Example for one IO device with 32 PhysicalSlots: 1,370 bytes of maximum user data

6.4 Functional Limitations

The following functions are not included in the current version:

• Redundant connections

• Takeover of modules by supervisor

• Device direct data exchange

• RT over UDP

• MRP (medium redundancy protocol)

6.5 Resource Requirements

The following resources are assigned in the current implementation (incl. operating system):

• 1,4 Mbytes of flash memory compressed

• 18 Mbytes of SDRAM

• Timer 0

Technical data subject to change Version 3.0.0