Technical Specifications Electrical & Interface Data Model ADV169-PK0 Product type Digital Input Module for compatible ST6 Module channel capacity 64-channel digital input module RIO System Upgrade input limit 32 input channels when used for the RIO System Upgrade Input signal Contact input: OFF signal 100 kΩ or more; ON signal 200 Ω or lower.Voltage input: OFF signal 4.5 to 25 V DC; ON signal ±1 V DC, 200 Ω or lower. Input contact rating 5 V DC, 20 mA or higher Input