To make wiring easier, you can connect the STP26 screw terminal panel to the Digital connector on the DT7837 module.
The STP26 contains one 26-pin connector and a screw terminal block. The 26-pin connector provides access to the signals from the Digital connector on the DT7837 module. The following figure shows the layout of the STP26 and lists the screw terminal assignments
Note, that by default, general-purpose inputs 0 to 7 are configured as digital input signals and general-purpose outputs 0 to 7 are configured as digital output signals.