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Static Digital Inputs


The Static Digital In functionality of the OPAL-RT Board driver provides the simulation with the static digital input acquisition data obtained from the digital input channels of the OP5353 modules installed in the simulator.
In the case of the OP4200 chassis, the OP5353 module is incorporated into the I/O cassette with ID OP4250-1.

Digital input is referred to as static when the data reported to the simulation is directly related to the physical values received by the simulator: a high voltage translates to a logical "true", "on" or 1, whereas a low voltage represents logical "false", "off" or 0.


Once the bitstream configuration file has been parsed, the location of the digital input modules becomes visible to the user. The channels of the modules are grouped into bunches of 8. By clicking on each group of 8, the user has access to the configurable options of the group.

Bitstreams generated with an RT-XSG version of 3.1.2 or later offer the possibility of using the selectable digital input-output feature (SDIO).
The SDIO feature gives the user the option to switch between the type of functionality (either static, PWM or Event Detector) for a group of channels.
The user will know if the bitstream offers the feature as soon as its configuration is loaded in the main section of the current board's configuration page.
Verifying that a bitstream is SDIO-capable is done in the channel group configuration section. If the bitstream has the feature then a drop-down list will be present for choosing the functionality. If it does not, the functionality will be displayed as a non-editable field (i.e. grayed out).

Channel group configuration

  • Name
    The name of the channel group denotes the physical channels of the digital input module the current configuration will be applied to.

  • Enable
    Checking this box will enable the acquisition of static digital data for the channels in the group once the simulation has started, provided that the type of functionality is set to Static (see item below for more detail).
    Clicking on Enable also makes the group of 8 channels available as connection points in HYPERSIM. This means that if the user wishes to display and/or monitor the static digital data received, connections must be made between points in the model and the static digital input connectable points.

  • Digital type
    In case the bitstream is SDIO-capable, this field will take the form of a drop-down list. This list provides the user the choices for the type of functionality to be applied for the current group of 8 digital input channels.
    To receive static digital inputs, the option Static must be chosen.
    Otherwise, if the bitstream is not SDIO-capable, this field will be seen as non-editable. This means that the 8 channels in the current group can only operate with the functionality described in the grayed-out field. For receiving static digital inputs, please verify that the field displays Static.

Signals configuration

Channels in static digital input groups do not have any parameters to configure.

Characteristics and limitations

For the connector pin assignments, the user should refer to the carrier documentation.

The current version of the static digital input functionality of the OPAL-RT Board driver has the following limitations:

  • Limitations will be added as they are found

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