If you have questions about our products, Fill out the form below and we will answer any questions you have. Tips: Fields marked with*are required. ABB AX521 1SAP250100R0001 Analog Input/Output Module Overview amp; Physical Details Parameter Description Module Type Analog Input / Output Module Model AX521 Order Number 1SAP250100R0001 Analog Inputs 4 channels (voltage, current, RTD) Analog Outputs 4 channels (voltage, current) Resolution *Your Name: *Your Email: *Your Name: *Vdcode: Submit