ABB TU516-H Hot-Swap I/O Terminal Unit
A 24 V DC spring-terminal base for compatible analog and digital I/O modules that require the designated hot-swap terminal-unit arrangement.
Overview
TU516-H is the hot-swap member of the ABB TU516 terminal-unit family. It provides the field-wiring base for compatible AC500 and S500 analog or 24 V DC digital I/O modules while keeping the module and wiring functions physically separated.
Forty front terminals accommodate as many as 32 module channels in four groups. The inserted I/O module determines the actual channel allocation, while the base distributes the UP and ZP process-supply connections across the documented terminal groups.
Specs
| Manufacturer | ABB |
|---|---|
| Model | TU516-H |
| Order Code | 1SAP215000R0001 |
| Product Type | Hot-swap I/O terminal unit |
| Supported Signal Classes | Compatible analog and 24 V DC digital I/O modules |
| Terminal Technology | Spring terminals |
| Field Terminals | 40 |
| Maximum Channel Capacity | 32, defined by the inserted I/O module |
| Channel Grouping | 4 groups of up to 8 channels |
| Rated Voltage | 24 V DC |
| Maximum Permitted Current | 10 A per separated process-voltage terminal or internal process-voltage connection |
| Process Supply Assignment | UP = +24 V DC; ZP = 0 V |
| Grounding | Grounded DIN rail or wall-mounting screws |
| Mounting Position | Horizontal or vertical |
Features
- Hot-swap construction distinguishes TU516-H from the standard TU516 spring-terminal base.
- Spring-clamp connections support field wiring without the screw-tightening operation used by the related TU515 base.
- Two mechanical locks secure a properly seated I/O module to the terminal unit.
- The base preserves the field terminations when the compatible plug-in I/O module is removed under the approved service procedure.
- Four groups provide an organized terminal map for as many as eight channels per group.
Applications
- Distributed AC500 or S500 I/O stations where the installed module and system configuration explicitly support hot-swap operation.
- Maintenance-sensitive process or machine-control panels that require the field wiring to remain on the terminal base during a compatible module exchange.
- Analog and 24 V DC digital signal groups using the terminal allocation assigned by the selected ABB I/O module.
- DIN-rail or wall-mounted control assemblies supplied from a documented 24 V DC process-power arrangement.
Lifecycle
- Preserve the complete TU516-H model and order code during replacement because standard TU516, TU516-XC and TU516-H-XC products are separate variants.
- Confirm that the inserted I/O module, module hardware index and bus-master configuration permit hot-swap operation before treating the base as an online-replacement solution.
- Label all forty terminal positions and record the I/O module type, station address and process-supply grouping before removing an installed base.
- Check the DIN-rail grounding, UP/ZP polarity and mechanical locks before returning a replaced station to service.
FAQ
What is the defining difference between TU516-H and TU516?
TU516-H is the designated hot-swap terminal unit; TU516 is the standard spring-terminal version.
Which module types are intended for this base?
It is designed for compatible ABB analog and 24 V DC digital I/O modules.
How many channels can the terminal unit accommodate?
The maximum is 32 channels in four groups, while the installed I/O module defines the actual allocation.
Does the terminal unit alone guarantee hot-swap operation?
No. The installed module, its hardware index and the bus-master configuration must also support the approved hot-swap arrangement.
Which field-connection method is used?
TU516-H uses spring terminals.
What must be documented before replacing the base?
Record the exact order code, I/O module, station configuration, UP/ZP wiring and every channel label.
Recommended Models
| FX-PCG2621-0 | ABB CI502 | SSA61 |
| EXB-REL8 | 1746-OB32 | DSE9150 |
| 6ED1055-1MD00-0BA2 | 4000094-310 | SM1.125-C04L-20-V-SS-3182 |
| 3000 / 1404-DM / A | ABB 6220-0-0117 | THR03-D11-30-N |
| 371-03638-000 | RXC21.5/00021 | R0011/2CDG110081R0011 |
| 1700100 | JUMO 902821/80 | DV1221A |
| 6197/51-515 | KFD2-STC4-Ex120 | RB2 BA3 |
| M802-MD9 | 9170/20-10-11s | MC7004-PUCDCQHA80R |
| 33-N-716-50-1 | ZN341V | 05 D0-05DR-D |
| 3005A | SL30-1 | AX-4SW |
