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8DO Remote I/O Module for ADAM-3600 Rated voltage : 8 ~ 30 VDC. Supports open collector (Sink) output type. Over voltage protection : +40 VDC. Opto-isolator response time : 150 us (max). Pulse output frequency : 1 KHz. Isolation voltage : 2000 VDC. Rated current : 200 mA (max load). -40 ~ 70°C operating temperature.