Wittelb WIN-IO-4DI3DO4AI2AOM I/O Module, 4DI/3DO/4AI/2AO, Modbus RS485

Use the onboard DIP switches to set the Modbus slave ID (1-247), baud rate (common settings: 9600, 19200, 38400, 57600, 115200), parity (None, Even, Odd), and stop bits. Refer to the datasheet for the specific switch mapping. After power cycling, the module will communicate using the newly set parameters over the RS485 A/B terminals.

The analog inputs typically accept a 0-10V DC signal range, converting it with 10-bit resolution (0-1023 counts). The analog outputs also provide a 0-10V DC output signal based on the 10-bit value written via Modbus. Always verify the exact input impedance and output drive capability in the technical datasheet before connecting sensors or actuators.

Digital inputs are typically designed for 24V DC wetting voltage; connect the sensor's positive to the DI terminal and common negative to the module's COM. Digital outputs are often open-collector or relay-driver types; connect your load (e.g., relay coil) between the DO terminal and a 24V DC supply. Always confirm the sinking/sourcing type and maximum current rating from the datasheet to ensure compatibility.

Yes, you can connect up to 247 modules on one RS485 bus. Wire the RS485 A and B terminals in parallel across all modules, ensuring unique slave IDs set via DIP switches on each unit. Terminate the bus with a 120-ohm resistor at the first and last module to prevent signal reflections, especially for long cable runs exceeding a few hundred meters.