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 2551-A is a high-speed 8-channel isolated thermocouple input module designed to be compatible with the 2500 Series™ programmable controller I/O base. The 2551-A translates thermocouple input signals into scaled temperature values and millivolt input signals into equivalent digital words.