The 2550-A is a high-speed 8-channel isolated analog input module designed to be compatible with the 2500 Series® I/O base. The 2550-A translates analog input signals into an equivalent digital word.

The 2555-A is a high-speed 16-channel differential analog input module designed to be compatible with the 2500 Series® I/O base. The 2555-A translates analog input signals into an equivalent digital word.

The 2558 is an 8-channel analog input module designed to be compatible with the 2500 Series® I/O base. The 2558 translates analog input signals into equivalent digital words. It is fully compatible with all versions of the Siemens 545 and 555 PLCs.