products for industrial process automation.
Control Technology Inc. (CTI) manufactures the CTI 2500 Series™ Programmable Controller System—a compatible replacement for the Simatic® 505.

The 2552-A is a high-speed 8-channel isolated RTD input module designed to be compatible with the 2500 Series™ PLC I/O base. The 2552-A translates RTD input signals into scaled temperature values and millivolt input signals into equivalent digital words.