BECKHOFF EL6900-FB - Manual (Page 26)

Function blocks
24 Function blocks for TwinSAFE logic terminals
3.2.3 FB OR configuration in the TwinCAT System Manager
Figure 3-4: FB OR configuration
Their characteristics are configured with the setting buttons on the right near the two OrIn inputs, whereby
the inputs are always single-channel. A discrepancy monitoring cannot be used for the OR.
The ‘OrIn(x)’ buttons are only available once the corresponding input was activated. In the default setting
all inputs are disabled.
The FB OR input variables are linked using the 'OrIn(x)' buttons.
The output variable of the FB OR are linked using the 'OrOut' button.
The ‘MapState’ and ‘MapDiag’ checkboxes are used to specify which FB diagnostic functions are mapped
to the cyclic process image.
The FB OR does not supply any error information and therefore the error button is basically deactivated.