Please find below the specification details for GPI [D-IN] and GPO [D-OUT] in the G41G units. Kindly note that the D-OUT circuit is a sinking-type output, so an external source voltage must be provided.
GPI [D-IN] Digital Input → 2 Ports (Max 32V, drive current < 1 mA)
GPO [D-OUT] Digital Output → 2 Ports (5V- 24V, Sink Current: 200mA)
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Please find the detailed G41G product information in the below link,