The Model 7020 and 7020-D Digital I/O Interface Cards: feature 40 independent digital inputs and 40 independent outputs to provide high-density, cost-effective digital monitoring and control. Versatile design and configuration: I/O options provide compatibility with a wide range of signals and loads. Internal pull-up resistors on the inputs provide level shifting so microswitches can be monitored directly. Each input: is protected against overvoltage, so logic levels up to 42V peak can be monitored. Digital outputs can drive relatively high-current devices, including solenoids, relays, and small motors, without the need for additional control circuitry.