ABB TU710F 3BDH000398R0001 Terminal Block Base

The ABB TU710F 3BDH000398R0001, also cataloged as the TU710F Terminal Block, operates as a dedicated hardware component for field wiring termination and bus interface base execution within ABB Freelance and S700 I/O platforms. Serving as the primary mounting and connection terminal block for the CI 741F PROFIBUS communication interface module, the base routes 24 VDC I/O signals and internal supply lines through spring-type connections. Internally bridged power terminals ensure stable reference potentials and high-current power distribution across connected communication expansion sub-assemblies.

Hardware Specifications

Deterministic Backplane & I/O Density Scaling Execution

The terminal unit utilizes ABB S700 platform backplane architecture optimized for high-speed signal distribution, maintaining deterministic network response across PROFIBUS segments. By providing hardwired spring-terminal connection pathways, the base maintains low-latency signal coupling between the host controller and the CI 741F communication interface. Hardware-level firmware flash compatibility across attached communication sub-assemblies supports scalable I/O density configurations while preserving signal integrity and galvanic isolation under continuous 10 A load current conditions.

Frequently Asked Questions

Q: How are internal voltage buses distributed across the TU710F terminal connections?

A: Supply voltage UP (+24 VDC) is internally connected across terminals 2.8 and 3.8, while reference potential ZP (0 V) is internally bridged across terminals 2.9 through 4.9 to simplify power wiring to the CI 741F module.

Q: What wire gauge compatibility is provided by the spring-type terminals on the TU710F?

A: The spring terminals accommodate solid and stranded field wiring sizes from 0.08 mm² to 2.5 mm² without requiring screw-torque verification.

Q: Can the CI 741F interface module be unseated from the TU710F base without disturbing field wiring?

A: Yes. The TU710F acts as a passive base unit, allowing the active CI 741F PROFIBUS module to be replaced while all 24 VDC field and signal wires remain securely clamped in the terminal block.

Field Installation Guidelines

1. Power Disconnection & Verification: De-energize all 24 VDC power supply circuits connected to terminals 2.8 and 3.8 prior to wiring or module mounting. Verify zero voltage potential with a calibrated meter across terminals 2.8 and 2.9.
2. DIN-Rail Mounting & Mechanical Locking: Mount the TU710F onto a standard 35 mm DIN-rail inside the enclosure. Press down until the integral locking latch firmly engages the rail edge to prevent axial displacement during cable routing.
3. Spring-Terminal Conductor Termination: Strip conductors to a length of 8 to 10 mm. Insert an actuation screwdriver into the spring release slot, push the wire fully into the conductor entry point (0.08 to 2.5 mm²), and release to clamp.
4. Shielding & Interference Isolation: Ground the PROFIBUS cable shield according to standard field guidelines using low-impedance grounding clamps. Ensure grounding braids maintain a minimum thread engagement of 5 turns on M4/M5 chassis grounding studs.