TU509 is the screw-terminal member of the ABB TU509/TU510 pair for AC500/S500 communication interface modules. It retains field and process-supply connections on the base while allowing the plug-in communication module to be removed.

A female 9-pin D-sub connector provides the serial network connection. Thirty terminals carry module-specific signals together with the UP, UP3 and ZP process voltages.

• Front screw terminals provide a conventional tightened connection for field and process-supply conductors.
• The 9-pin D-sub connector supports the serial-network interface defined by the inserted communication module.
• Two mechanical locks secure the plug-in communication interface module.
• The first-station I/O-bus connection is presented through a female 10-pin connector.
• Field wiring remains on the terminal unit during communication-module service.

• Use only with AC500/S500 communication interface modules that explicitly support TU509, TU510, TU517 or TU518 terminal units.
• The inserted module defines the signal allocation for channel groups 2, 3 and 4.
• TU509 uses screw terminals; TU510 uses spring terminals and is not the same orderable product.
• The standard TU509 is distinct from wide-temperature variants in the terminal-unit family.
• Confirm the communication protocol, D-sub pin usage and field-terminal assignment from the selected interface module.

• ABB lists TU509 order code 1SAP211000R0001 as Active.
• Preserve the screw-terminal requirement when replacing an installed TU509.
• Label the D-sub network cable, process supplies and all field terminals before base removal.
• Record the plug-in module type and network configuration so the replacement station can be checked before start-up.