1TNE968900R0100 is PM554-T CPU controller from ABB AC500-eCo compact PLC family with fixed screw terminal design. It serves as main processing unit for small and medium-size automation control systems, widely used for cabinet assembly and spare replacement in general industrial automation projects.

1TNE is fixed part number prefix for ABB AC500 series PLC products. 968900 corresponds to hardware specification of PM554-T CPU module. Suffix R0100 represents factory standard fixed-terminal version without removable plug terminal accessory. PM554-T is the official commercial model name.

The module operates with DC24V power supply. It is equipped with 128kB program memory and 64kB data memory. Onboard I/O includes 8 points DC digital input and 6 points transistor-type digital output with 0.5A single channel rated load. It adopts standard DIN rail installation, operating ambient temperature ranges from 0℃ to +55℃, storage temperature ranges from -25℃ to +70℃, protection grade IP20 for cabinet inner installation.

One built-in Ethernet port for programming and network data transmission, one onboard RS485 serial port supporting Modbus RTU, CS31 and ASCII communication protocols. Two reserved expansion slots are available for additional communication modules, and it can expand peripheral I/O by connecting S500 and S500-eCo remote I/O modules.

It runs user control programs compiled by Control Builder software with multiple programming languages including LD, ST, FBD and SFC. The CPU collects field discrete signals and realizes equipment interlock, timing and closed-loop automatic control. It uploads runtime data and fault messages to upper HMI or DCS via Ethernet or serial bus, and supports program backup and firmware upgrade via SD card. The controller can expand total I/O points up to 256 with matched expansion modules.

This CPU unit is deployed for packaging machinery, pump and fan group control, municipal wastewater treatment equipment and building automation control systems, matched with ABB low voltage components to form complete machine control solution.

Disconnect DC24V power before module dismounting or wiring modification. Perform quarterly maintenance to clear surface dust with dry compressed air and check terminal tightening status. Regularly back up control program into SD card to prevent program missing. Check cable connection status first before module replacement once communication failure occurs.