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 2554-A is an isolated 4-channel high-speed counter input module. Each channel can operate in one of three selectable modes: frequency, period, or general counter. In addition, two channels may be configured together for quadrature mode operation.