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6ES7331-7HF01-0AB0 PLC S7-300, Analog Input SM 331, Isolated, 8 AI, Resolution 14 Bit, Voltage Alarm, Diagnostics, Suitable for Isochronous Mode, Improved Bus Cycle Time for Isochronous Mode: Amazon.com: Industrial & Scientific
new original 6ES7 331-7HF01-0AB0 6ES7331-7HF01-0AB0