The Zone 1 Discrete I/O card provides 16, I.S. dry contact input channels (the first two channels can support pulse count) and 8, I.S. high-side output channels. The Zone 1 Discrete I/O card is housed in a sealed, flameproof enclosure measuring approximately 225×157×60 mm (8.8 x 6.1 x 2.3 inches).