ABB TU516 B4 AC500 AC800M I/O Terminal Base Unit
Manufacturer: ABB
-
Part Number: TU516 B4
Condition：New with Original Package
Product Type: I/O Terminal Units
-
Country of Origin: Sweden
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
ABB TU516 B4 AC500 / AC800M I/O Terminal Unit
The ABB TU516 B4, also cataloged as the TU516 I/O Terminal Unit (Product ID 1SAP212000R0001), operates as a dedicated hardware component for physical field wiring termination and module backplane interfacing within ABB AC500 and AC800M control systems.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | TU516 B4 |
| Brand | ABB |
| Origin | Sweden |
| Weight | 0.159 kg |
| Dimensions | 105 mm x 50 mm x 95 mm |
| Operating Temp | -25 deg C to +70 deg C |
| Power Consumption | 24 VDC system level pass-through |
| System Compatibility | ABB AC500 / AC800M PLCs |
| Supported Modules | Analog and 24 VDC Digital Modules |
| Interface Type | Screw-type terminals |
| Mounting Type | DIN rail mountable |
Backplane Bus Communication Velocity and Firmware Compatibility
The terminal base maps field sensor and actuator signals directly to the internal expansion bus, supporting high backplane bus communication velocity across digital and analog I/O channels. Internal conductive traces provide low-resistance transmission paths for 24 VDC field power lines and differential signal pairs, minimizing voltage drop and propagation delays. Physical keying slots prevent incorrect module seating, thereby protecting internal backplane logic lines and preserving firmware flash compatibility across connected controller racks during hardware assembly.
Frequently Asked Questions
Q: Does the terminal unit require software configuration or firmware flashing during installation?
A: No. The TU516 B4 functions as a passive electrical termination base and signal router. Parameterization and operational software firmware reside within the plugged I/O modules and the main CPU processor.
Q: Can I/O modules be removed from the terminal base without disconnecting field wiring?
A: Yes. The two-tier design allows I/O modules to be unlatched and replaced directly from the front face while all field conductors remain securely fastened to the screw-type terminal block.
Q: Are power and signal conductors isolated on this terminal unit?
A: Field power rails and signal lines route through isolated terminal blocks, maintaining electrical separation to prevent field noise from coupling into the controller logic bus.
Field Installation Guidelines
Snap the terminal base securely onto a grounded 35 mm DIN rail inside a switchgear cabinet or local junction box. Strip field wires to the specified length and secure them into the screw terminals using an insulated calibration screwdriver. Ensure that 24 VDC field power cables are separated from high-voltage AC lines within the cabinet wiring trunks to prevent electromagnetic interference. Strip and connect signal cable shields to the nearest cabinet earth ground bar via a low-impedance grounding strap.