ABB TU516 S500 I/O Terminal Unit – 1SAP212000R0001

The ABB TU516, product number 1SAP212000R0001, is an I/O terminal unit designed for compatible ABB S500 / AC500 analog and 24V DC digital I/O modules. It provides the mechanical mounting, field wiring terminals, process-voltage distribution and I/O-bus connections required for compatible S500 expansion modules.

The TU516 uses spring-type terminals, providing convenient field wiring without conventional terminal screws. ABB specifically identifies the TU516 for analog and 24V DC digital modules.

Spring-Terminal Connection

The main difference between the TU516 and the closely related TU515 is the field wiring connection method. The TU516 uses spring terminals, while the TU515 uses screw-type terminals.

Spring terminals provide a practical wiring solution for industrial control cabinets, especially where quick installation and maintenance are important.

40 Field Wiring Terminals

The TU516 provides 40 spring-type terminals for field signals and process-voltage connections. The actual signal assignment depends on the S500 I/O module installed on the terminal unit.

24V DC Process Supply Distribution

The terminal unit is designed for 24V DC process voltage. ABB specifies the following internally connected process-supply terminals:

• Terminals 1.8, 2.8, 3.8 and 4.8: UP = +24V DC
• Terminals 1.9, 2.9, 3.9 and 4.9: ZP = 0V

Supports Up to 32 I/O Channels

The TU516 terminal architecture supports a maximum of 32 channels, arranged as four groups of eight channels. The actual number and function of the channels depend on the installed I/O module.

Integrated S500 I/O Bus

The terminal unit includes S500 I/O-bus connections for electrical connection to adjacent terminal units, compatible CPU terminal bases or communication/interface terminal units.

A compatible S500 I/O module plugs directly onto the terminal unit. This design allows the I/O module to be removed or replaced while the field wiring remains connected to the TU516.

Key Specifications

Manufacturer	ABB
Model	TU516
Product Number	1SAP212000R0001
Product Family	ABB S500 / AC500
Product Type	I/O Terminal Unit
Compatible Module Type	Analog & 24V DC Digital S500 I/O Modules
Terminal Type	Spring Terminals
Number of Field Terminals	40
Maximum Channels	32
Channel Groups	4 Groups × 8 Channels
Rated Process Voltage	24V DC
Maximum Permitted Total Current	10A
Process Supply	UP = +24V DC / ZP = 0V
Protection Rating	IP20
Solid Conductor Cross Section	0.08–2.5 mm²
Flexible Conductor Cross Section	0.08–2.5 mm²
Wire-End Ferrule	0.25–1.5 mm²
Approx. Dimensions	67.5 × 135 × 30 mm
Approx. Weight	200 g
Mounting	DIN Rail / Wall Mounting

Typical Applications

• ABB AC500 PLC Systems
• ABB S500 I/O Systems
• Analog I/O Module Installation
• 24V DC Digital I/O Module Installation
• Industrial Control Cabinets
• Factory Automation
• Machine Automation
• Process Automation
• Distributed I/O Systems
• PLC System Expansion
• Industrial Equipment Repair and Maintenance

Module Replacement Without Rewiring

The modular S500 design allows a compatible I/O module to plug into the TU516. The field wiring remains connected to the terminal unit, making module replacement and maintenance easier without requiring the complete field wiring to be disconnected.

Important Compatibility Information

The TU516 is intended for compatible analog and 24V DC digital S500 modules. It should not automatically be assumed compatible with every ABB S500 module. High-current and other specialized modules may require a different terminal unit.

Always verify the required terminal-unit type in the technical documentation for the specific ABB I/O module before installation.