Description

Key Technical Specifications

Parameter	Specification
Manufacturer	ABB
Product Name	TP858 Baseplate
Part Number	3BSE018198R1 (as provided; verify against label)
Common Published P/N	3BSE018138R1
Compatible Modules	CI858, CI858A DriveBus interface
System Platform	ABB AC 800M / S800 I/O
Mounting	DIN-rail mount
Communication Role	Passive baseplate; communication handled by CI858/CI858A
Typical Application	DriveBus communication for ABB drives and drive I/O
Protection Class	Typically IP20 for S800 I/O modules
Origin	Sweden (commonly listed)

Product Introduction

The TP858 is one of those parts nobody notices until the drive link goes dark. It is not a controller, not a PROFIBUS card, and not a generic terminal block. It is the S800 I/O baseplate that lets a CI858 or CI858A DriveBus interface sit properly on the DIN rail and connect into the AC 800M system.I keep TP858 baseplates in the spare list because a damaged connector, cracked DIN-rail latch, or corroded bus contact can make a perfectly good CI858 look faulty. The baseplate itself does not run logic, but it carries power, bus signals, and mechanical alignment. If those are compromised, the drive interface will misbehave, drop nodes, or refuse to initialize. This specific revision number, 3BSE018198R1, needs label verification before it goes into a live cabinet.

Quality SOP & Tech Pitfalls

The Lab Report (SOP)

Visual inspection: check DIN-rail latch, housing cracks, connector pins, and label legibility.
Label verification: confirm TP858 and the exact suffix 3BSE018198R1 or 3BSE018138R1.
Connector check: inspect the CI858 mating connector for bent pins, oxidation, or loose contacts.
Continuity check: verify bus and power pin continuity with a Fluke 115 or equivalent multimeter.
Insulation check: confirm no short between adjacent contacts or to the mounting rail.
Mechanical fit test: seat a CI858/CI858A module and confirm firm engagement.
Packaging: seal in anti-static bag with photos of label and connector condition.

The Engineer’s Warning (Pitfalls)
The most common mistake is assuming any TP858 baseplate is identical. Some listings mix up 3BSE018138R1, 3BSE018198R1, and other TP8xx baseplates. A wrong baseplate may physically fit but still cause communication faults. I have seen a CI858 replaced twice before the real culprit turned out to be a worn baseplate connector. The module seated, the LEDs looked normal, but the DriveBus segment kept dropping nodes under vibration.Also, do not confuse the TP858/CI858 DriveBus link with PROFIBUS DP. DriveBus is an ABB drive communication interface used with AC 800M and S800 I/O. If your system runs PROFIBUS, you are probably looking at FPBA-01, RPBA-01, or another fieldbus adapter, not this baseplate.

Installation & Configuration Guide

1. Pre-Installation
⚠️ Follow plant safety procedures and obtain authorization before working on live I/O racks.
⚠️ Photograph the existing baseplate, CI858 module, DriveBus fiber/cable connections, and rack position.
⚠️ Confirm the replacement baseplate matches the existing part number and the CI858/CI858A module.2. Removal
Power down the S800 I/O segment if required by site procedure. Disconnect DriveBus cables or fibers. Remove the CI858 module carefully. Release the baseplate from the DIN rail without disturbing adjacent modules.3. Installation
Snap the new TP858 onto the DIN rail in the correct slot. Seat the CI858/CI858A module firmly until it locks. Reconnect DriveBus links exactly as photographed. Verify node addresses and termination settings on the CI858 before energizing.4. Power-On & Testing
Restore power to the S800 I/O segment. Check CI858 LEDs and AC 800M diagnostics. Verify DriveBus node communication, fault history, and drive status. Run a controlled test with the drive isolated if possible. If nodes fail to appear, recheck seating, cabling, and baseplate contacts before replacing the interface module.

Compatible Replacement Models

Replacement Option	Compatibility	Notes
ABB TP858 3BSE018198R1	✅ Drop-in	Match only if the existing baseplate carries the same number.
ABB TP858 3BSE018138R1	⚠️ Likely Compatible	Common TP858 number; verify revision and CI858/CI858A fit.
Other TP8xx S800 baseplates	❌ Not a Direct Swap	Different module families. Do not substitute without ABB documentation.
Full AC 800M / S800 upgrade	❌ Project Change	Requires engineering review, I/O mapping, and commissioning.

Frequently Asked Questions (FAQ)

Q1: Is the TP858 a communication module?
No. It is a baseplate. The actual DriveBus communication is handled by the CI858 or CI858A module.Q2: Does 3BSE018198R1 replace 3BSE018138R1?
Not automatically. They are very close, but the suffix differs. Confirm against the installed label and ABB documentation before swapping.Q3: Can I use the TP858 with any S800 module?
No. The TP858 is intended for CI858/CI858A DriveBus interface modules. Other S800 modules use their own TP-series baseplates.Q4: Is this PROFIBUS hardware?
No. CI858/CI858A is an ABB DriveBus interface, not a PROFIBUS DP adapter.Q5: Can I replace it hot?
Only if your site procedure and system design allow hot replacement of S800 I/O components. DriveBus faults can affect multiple drives, so treat this as a controlled change.Q6: What condition should I expect when buying?
Most TP858 baseplates on the market are new surplus, tested used, or factory-sealed legacy stock. Request photos of the label and connector before purchase.