The PCI-1735U-AE from Advantech is a 64-channel TTL digital I/O card with a built-in counter, designed for use in industrial automation and control applications. It features 64 optically isolated digital I/O, with each channel programmable to be either input or output, plus a 32-bit counter/timer. The digital I/O lines are protected against surges up to 2000V. The PCI-1735U-AE also features individually adjustable interrupt and filter triggers, allowing it to be used in a variety of applications, including digital control and monitoring, frequency measurement, and pulse count.