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PLC Control Board, Fx3U14Mr 8 Input 6 Output Programmable Simple Industrial Controller: Amazon.com: Tools & Home Improvement
USB Digital I/O Module with 4 Input and 4 Output Channels
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Input Output Controllers | RS Components
Analog Input/Output and Digital Input/Output Tengcon PLC T-910 Programmable Logic Controller - China Programmable Logic Controller, Relay Output | Made-in-China.com
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BF-1010 Digital Input and Output Controller from Chiyu | Digital IO Controller Supplier