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ABB AX521-XC Analog input/output module. 4 AI: U, I, RTD. 4 AO: U, I (AX521-XC)
AX521-XC: S500 Analog input/output module. 4 AI: U, I, RTD. 4 AO: U, I. 1-wire. eXtreme Conditions.
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