The I/O 24 ULN2803 Switch Board shown below in diagram 1 is a very useful accessory board that allows much higher voltage and current devices to be interfaced to the low level logic provided by the I/O24 modules.

• 1 x ULN2803 High Voltage / High Current Transistor Array
• Indication LED's for channel status
• Screw Terminal Blocks for outputs
• Easy connection by 10-way box header to suit standard IDC connector for connection to the I/O port
• 72mm Standard width for DIN Rail Modules
• Dimensions – 2.6 X 2.8 X 1 inches (65 X 72 X 25.4mm)
• Includes 12 inch (30cm) ribbon cable with female headers at each end

Data Sheet