Application Scenarios

In an automated bottling plant,hundreds of sensors(like bottle presence detectors)and actuators(like solenoid valves for filling)are spread along the production line.Running individual wires from each device back to a central control room is costly and complex.Instead,distributed I/O stations are placed close to the machinery.Here,the ABB TB850​serves as the foundational building block.An S800 digital input module,for instance,snaps securely onto the TB850.Field wires from 16 proximity sensors are landed on the TB850’s screw terminals.The terminal base then routes these signals precisely to the correct pins on the mounted I/O module,which communicates the data to the PLC over a network.The TB850’s value is in providing a robust,organized,and easily maintainable connection point that simplifies wiring,reduces installation time,and ensures reliable signal integrity in a high-vibration industrial environment.

Parameter

Main Parameters

Value/Description

Product Model​

TB850​

Manufacturer​

ABB(Asea Brown Boveri)

Product Category​

Terminal Base Unit/I/O Carrier Module

Compatible System​

ABB S800 I/O System

Mounting​

DIN Rail mountable(35mm standard rail).[Enables easy installation in control panels]

Connection Type​

Removable screw terminal blocks for field wiring.[Allows for easy wiring and module replacement]

Module Compatibility​

Designed to accept a wide range of S800 I/O modules(Digital I/O,Analog I/O,Communication).[Provides system flexibility]

Terminal Capacity​

Typically accommodates the wire size and number of connections required for its paired I/O module.

Keying Feature​

Mechanical keying to prevent incorrect module insertion.[Prevents installation errors]

Status Indicators​

Provides pass-through for the I/O module’s LED status indicators.[Enables visual diagnostics]

Primary Function​

Provides the electrical interface and mechanical mounting between an S800 I/O module and field device wiring.

Technical Principles and Innovative Values

Innovation Point 1:Modular Decoupling for Maximum Flexibility and Uptime:​The TB850’s core innovation is the separation of the terminal base from the electronic I/O module.This allows the field wiring to be permanently installed,terminated,and labeled on the TB850.If an electronic module fails or needs upgrading,it can be snapped out and replaced in seconds without ever touching the field wiring.This dramatically reduces mean-time-to-repair(MTTR)and minimizes the risk of wiring errors during maintenance.

Innovation Point 2:Universal Platform with Intelligent Keying:​The TB850​is part of a family of bases designed for different I/O modules,but it exemplifies the standardized,robust interface.It features a mechanical keying system that only allows the correct type of electronic module to be inserted.This prevents catastrophic misplacement—for example,stopping a 24V DC output module from being inserted into a base wired for 120V AC inputs,protecting both personnel and equipment.

Innovation Point 3:Optimized for High-Density,Reliable Connections:​Designed for high-volume industrial use,the TB850​features robust screw terminals that maintain a secure connection even under vibration.Its compact DIN-rail design allows for high-density packing of I/O points in a control cabinet,saving valuable panel space.The design ensures optimal signal integrity by providing a direct,low-resistance path from the field wire to the module’s electronics.

Application Cases and Industry Value

Case Study:Pharmaceutical Cleanroom HVAC Control System Retrofit

A pharmaceutical manufacturer needed to upgrade the control system for a critical cleanroom’s Heating,Ventilation,and Air Conditioning(HVAC)system to meet new regulatory standards.The existing system used a hardwired panel with tangled wires,making modifications and troubleshooting slow and error-prone.

Solution&Implementation:

The new design utilized a distributed ABB S800 I/O system.Dozens of ABB TB850​terminal bases were mounted on DIN rails inside local enclosure near air handlers.A mix of analog input modules(for temperature,humidity,pressure sensors)and digital output modules(for valve and damper actuators)were snapped onto the bases.All field wiring was neatly landed once on the TB850​terminals and never needed to be touched again.

Results and Value Delivered:

Drastically Reduced Commissioning and Maintenance Time:​During startup,sensors and actuators could be checked and calibrated without accessing the main PLC.Later,when a faulty temperature transmitter module was identified,it was simply unclipped from the TB850​and replaced in under a minute,with zero risk to the carefully documented field wiring.

Enhanced System Documentation and Safety:​Each TB850​was clearly labeled,corresponding directly to the electrical drawings.The physical separation of wiring(on the base)and electronics(on the module)made the system safer and easier for technicians to understand and work on.

Future-Proof Flexibility:​When a new pressure sensor with a different signal type was added a year later,only the electronic module on the existing TB850​needed to be changed,not the cabinet wiring,saving significant engineering and downtime costs.

Related Product Combination Solutions

S800 I/O Electronic Modules(e.g.,DI:DSDO451,AI:AINO451):​These are the”brains”that snap onto the TB850.They contain the circuitry to read sensor signals or command actuators and communicate on the network.

S800 I/O Communication Interface(e.g.,CI854):​This master module,mounted on its own terminal base,manages communication between a group of TB850-mounted I/O modules and the higher-level controller network(e.g.,Profibus,PROFINET).

S800 I/O Power Supply(e.g.,PS801):​Provides the necessary 24V DC power to the backplane of the mounting rack,which in turn powers the electronic modules attached to the TB850​bases.

S800 I/O Mounting Rack/Chassis:​A modular rack that holds and interconnects multiple TB850​terminal bases(or other S800 bases),providing the internal communication bus and power distribution.

ABB 800xA or AC 800M Controller:​The high-level process controller(e.g.,a PM803)that executes the control logic and exchanges data with the S800 I/O stations via a network module.

ABB Drive Modules(e.g.,for ACS drives):​While not directly connected,drives are often controlled and monitored via signals routed through digital and analog modules mounted on TB850​bases.

End Caps and Accessories:​Mechanical accessories like end plates for the DIN rail assembly and labeling kits that are used alongside the TB850​for a complete,professional installation.

Installation,Maintenance,and Full-Cycle Support

Installation is simple and efficient.The ABB TB850​is first snapped onto a standard 35mm DIN rail.Field wires from sensors,switches,or actuators are then landed and tightened in its clearly marked screw terminal blocks according to the wiring diagram.Finally,the appropriate S800 I/O electronic module is aligned and firmly pressed onto the TB850​until it clicks into place,automatically making all electrical connections.No special tools are required for assembly.

Maintenance primarily involves the electronic modules,not the TB850​base itself,which is typically a lifetime component.The primary maintenance task on the base is periodically checking terminal tightness during routine inspections.If a base is damaged,replacement is straightforward:the electronic module is removed,the field wires are loosened,the old TB850​is unclipped from the rail,and a new one is installed—following the existing wiring labels.This process safeguards the integrity of the field wiring.

We provide comprehensive support for the ABB TB850​and the entire S800 I/O system.Our services include confirming the correct base model for your specific I/O module,supplying guaranteed genuine components,and offering technical guidance for installation and troubleshooting.We understand that these components are the backbone of a reliable control system,and we ensure the parts we supply meet original specifications for a secure and lasting connection.