Description

Key Technical Specifications

Parameter	Specification
Order Code	3BSE025349R1
Model	TP854
Product Type	Base unit / termination base for S800 communication interface
Primary Compatible Module	CI854 PROFIBUS DP-V1 interface module
Also Referenced With	CI858-related base applications
System Family	ABB AC 800M / S800 I/O
Function	Mechanical mounting, field wiring termination, S800 I/O bus interface
Dimensions (L × W × H)	216 × 72 × 49.5 mm
Net Weight	0.234 kg
Mounting	DIN rail or panel mounting, S800-style
Condition	Typically new surplus, tested surplus, or refurbished

Product Introduction

The TP854 is one of those parts that never gets credit until it is missing. It is not a CPU. It is not a PROFIBUS master. It is the base that lets a CI854 PROFIBUS DP-V1 interface sit correctly in an S800 I/O segment and connect to the field wiring and the S800 bus. Without the correct base, the CI854 cannot terminate properly, the wiring becomes unreliable, and the module may not seat or lock correctly.In AC 800M systems, the TP854 shows up most often during communication module replacements, rack rebuilds, or migration projects. The biggest risk is assuming all S800 bases are interchangeable. They are not. CI854, CI858, AI, DI, and AO bases can look similar but have different bus contacts, termination arrangements, and mechanical keying. Always match the base to the exact module and the existing S800 station layout.

Quality SOP & Tech Pitfalls

The Lab Report (SOP)

Visual inspection: verify ABB labeling, order code 3BSE025349R1, and model TP854.
Mechanical check: inspect DIN-rail clip, mounting holes, guide rails, and locking mechanism.
Connector inspection: check S800 bus contacts, module-side pins, and field terminal area.
Fit verification: confirm the base matches CI854 or the site-specified CI858 application.
Continuity check: verify bus contact integrity and terminal connections where applicable.
Documentation: photograph labels, record revision, and confirm compatibility with the existing S800 station.

The Engineer’s Warning (Pitfalls)

Wrong base for the module. The TP854 is primarily documented for CI854 PROFIBUS DP-V1, but some listings associate it with CI858 applications. Do not force a base onto a module unless the OEM documentation confirms it.
Treating it as a controller or I/O card. This base has no logic, no channels, and no PROFIBUS functionality by itself. It only supports the module mounted on it.
Ignoring S800 station addressing. The PROFIBUS address and module configuration live in the CI854 and the AC 800M project, not in the base. Replacing the base does not change the node address.
Damaged bus contacts. A bent S800 bus pin can cause intermittent communication faults that look like a PROFIBUS network problem. Inspect the base contacts before installing a new CI854.

Installation & Configuration Guide

Pre-Installation
- ⚠️ Confirm maintenance window and whether the CI854 is live in the AC 800M station.
- ⚠️ Photograph existing base, module, terminal wiring, S800 bus position, and PROFIBUS cabling.
- Verify the replacement base matches the installed module: CI854 or CI858.
Removal
- Disconnect field wiring and PROFIBUS cables as required.
- Remove the CI854 module from the existing base.
- Release the base from the DIN rail or mounting structure.
Installation
- Mount the TP854 base in the same S800 position.
- Verify S800 bus alignment before locking the base.
- Install the CI854 module firmly until it seats and locks.
- Reconnect PROFIBUS and field wiring exactly as documented.
Power-On & Testing
- Verify S800 bus power and station status.
- Check CI854 diagnostics in the AC 800M engineering tool.
- Confirm PROFIBUS DP-V1 communication with connected devices.
- Verify that the station address and GSD/device configuration remain correct.
- Document the replacement, including order code, revision, and test results.

Compatible Replacement Models

Compatibility	Model / Option	Notes
✅ Drop-in	ABB TP854, 3BSE025349R1	Match CI854 application and S800 station layout.
✅ Functional Replacement	ABB TP854, approved revision	Verify against ABB S800/AC 800M documentation.
⚠️ Engineering Review	Other S800 bases	Only use if explicitly approved for CI854/CI858 in the OEM manual.
❌ Not Compatible	Generic DIN-rail plates	Will not provide S800 bus connection or correct module termination.

Frequently Asked Questions (FAQ)

Q: Is TP854 a controller or I/O module?
A: No. It is a base unit. It provides mounting, wiring termination, and S800 bus connection for a communication module such as CI854.Q: Which module does TP854 support?
A: It is primarily used with the CI854 PROFIBUS DP-V1 interface module. Some references also mention CI858-related base use, so confirm against the installed hardware and ABB documentation.Q: Can I replace this base online?
A: Only under an approved procedure. Removing the base usually requires removing the CI854 module, which interrupts that communication interface.Q: Does this base set the PROFIBUS address?
A: No. The PROFIBUS address and device configuration are handled by the CI854 module and the AC 800M project.Q: Is 3BSE025349R1 still in production?
A: The S800 platform is mature/legacy in many installations. Most available units are new surplus, tested surplus, or refurbished. Confirm condition and revision with the supplier.Q: What warranty should I expect?
A: Reputable industrial suppliers typically offer 12 months on tested surplus units. For communication infrastructure parts, request photos and a basic fit/continuity check.