ABB 1SAP250100R0001 AX521 is a 4-channel analog input / 4-channel analog output module for ABB AC500 PLCs (S500 I/O). The AI side supports voltage (U), current (I), and RTD sensors, while the AO side provides voltage (U) or current (I) outputs, enabling mixed-signal interfacing on a single card. Designed for use on the S500 I/O bus, AX521 consolidates analog I/O in a compact 4 AI/4 AO package, suitable for measurement and control tasks across process and factory automation.
