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购买 modbus module
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$1,016.45
SNAP-B3000-MODBUS OPTO 22 - Plcs/Machine Control & VDC Logic I/O Module Supplies
Radwell.com
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T1K-MODBUS AUTOMATION DIRECT - Plcs/Machine Control & PLC Module/Rack Supplies
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1062540 Phoenix Contact - GW EIP/MODBUS 1E/1DB9 | PLC Direct | Programmable Logic Controllers And Industrial Automation Products
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Waveshare Industrial 8-Ch Digital Input & Output Module, DC 736V Wide Voltage Power Supply, Modbus RTU Protocol, Multiple Isolation Protection
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