Changing PiFace projects or runtime systems for Raspberry Pi to use the generice IO provider

The access to hardware IOs of a →PiFace is possible by using a generic IO provider concept of Neuron Power Engineer. This article informs whether and which steps are necessary for this access.

Recommended: Using the project template for PiFace in Neuron Power Engineer version ≥ 1.121.0 and Neuron RTS max version ≥ 3.32.0

You do not have to do anything. Reasons:

• The PLC-object raspberry of the project that has been created based on a project template for PiFace, e.g. Turn LEDs on/off (PiFace required), using Neuron Power Engineer version ≥ 1.121.0 already contains the needed code.

• Neuron RTS max for Raspberry Pi, ≥ version 3.32.0 is already correctly configured.

Using other projects

If you want to use other projects (e.g. projects that have been created by using a Neuron Power Engineer version 1.120.0), the following specification for IO_IMPORT is required within the PLC-object:

{ IO_IMPORT PROVIDER := GenericProvider, SERVICE := PiFace }

CONFIGURATION RaspbianConfiguration

  RESOURCE raspberry ON Raspbian { ON_CHANNEL := RaspberryChannel }

    { IO_IMPORT PROVIDER := GenericProvider, SERVICE := PiFace }

    VAR_GLOBAL

      DigitalIn1 AT %IX1.0.0 : BOOL;

      (* ... and more declarations of global variables ... *)

    END_VAR

    {IO} TASK DefaultTask(INTERVAL := TIME#500ms, PRIORITY := 38229);

    PROGRAM LEDInstance WITH DefaultTask :

    LED;

  END_RESOURCE

END_CONFIGURATION

Using Neuron RTS max configuration file from a previous Neuron RTS max version

If you want to go on using the Neuron RTS max configuration file of a previous Neuron RTS max version, you have to change this file.

1. If Neuron RTS max is running, terminate Neuron RTS max.

2. Copy the configuration file /opt/RTS/PLC/RTSIO.cfg of the previous Neuron RTS max version into the installation directory of the current Neuron RTS max version.

3. Open the file /opt/RTS/PLC/RTSIO.cfg in a text editor.

4. Search for the following lines:

   Existing lines
   AddSymbol IOSS.DeviceNum 1 AddSymbol IOSS.Name[0] RTSS_PIFACE_IO AddSymbol IOSS.SSId[0] 536870978 AddSymbol IOSS.DeviceId[0] 1 AddSymbol IOSS.IB[0] 4096 AddSymbol IOSS.OB[0] 4096 AddSymbol IOSS.MB[0] 0 LoadLibrary RTSS_IO LoadLibrary RTSS_PIFACE_IO

5. Delete the lines incl. line  LoadLibrary RTSS_IO.
   Hence, the following line remains out of the above line block within the file:

   Remaining line
   LoadLibrary RTSS_PIFACE_IO

6. Save the changes and exit the editor.

7. Restart Neuron RTS max.