Should both ABB TB840A 3BSE037760R1 modems use the same optical line in a redundant arrangement?

No. ABB describes redundant TB840A units on different optical ModuleBus lines while both connect to the same electrical ModuleBus.

How should a station with more than 12 I/O modules be arranged around ABB TB840A 3BSE037760R1?

Do not extend one electrical ModuleBus beyond 12 I/O modules. Distribute additional I/O through optical ModuleBus clusters; ABB specifies up to seven clusters on the fiber-optic bus.

Which MTU fits a dual-ModuleBus redundant ABB TB840A 3BSE037760R1 installation?

TU840 is the listed MTU for redundant TB840/TB840A with dual ModuleBus. TU841 is the listed alternative for a single ModuleBus arrangement.

Does ABB TB840A 3BSE037760R1 translate between two independent communication protocols?

No. Its optical and electrical interfaces are logically the same ModuleBus. TB840A is a ModuleBus slave, not a general-purpose protocol gateway.

Can ABB TB840A 3BSE037760R1 be used with an HI controller?

Yes. ABB lists use with an HI controller. This entry describes controller compatibility; it does not assign a safety integrity level to the complete I/O installation.

What power-protection features are built into ABB TB840A 3BSE037760R1?

The module provides an isolated supply to the I/O modules and fused input power. These are separate features from its optical communication interface.

When checking ABB TB840A 3BSE037760R1, should diagnostics be limited to the optical path?

No. ABB lists supervisory functions for both the I/O ModuleBus and the power supply, so a cluster check must distinguish bus status from supply status.

What typical 24 V current should be allowed for ABB TB840A 3BSE037760R1 itself?

ABB publishes typical 24 V consumption of 120 mA. Treat this as the modem consumption, not as a published maximum or the total demand of all connected I/O modules.

TB840A 3BSE037760R1 | ABB | S800 I/O ModuleBus Cluster Mode

Name: TB840A 3BSE037760R1
Brand: ABB
SKU: 3BSE037760R1

TB840A 3BSE037760R1

S800 I/O ModuleBus Cluster Modem

In Stock

Ships by Tuesday, October 6

Fast Shipping Available

Technical specifications for TB840A 3BSE037760R1

Manufacturer:

ABB

Product Category:

DCS System

Spare Part Number:

3BSE037760R1

Estimated shipping dimensions:

5.3x10.5x12cm

Weight:

0.2 kg

Tariff Code:

8537101190

Counliy of origin:

Sweden

Communication protocol:

ModuleBus

Bus role:

Slave

Fiber-optic ports:

Electrical ModuleBus capacity:

Maximum 12 I/O modules

Optical ModuleBus capacity:

Maximum 7 clusters

Line redundancy:

Supported

Module redundancy:

Supported

Hot swap:

Supported

HI controller use:

Supported

24 V current consumption:

120 mA typical

Dual-ModuleBus redundant MTU:

TU840

Single-ModuleBus redundant MTU:

TU841

I/O power supply:

Isolated; input power fused

Operating temperature:

0 to +55 degrees C

Approval temperature range:

+5 to +55 degrees C

Vertical-mounting ambient:

Maximum +40 degrees C

Storage temperature:

-40 to +70 degrees C

Relative humidity:

5 to 95%; non-condensing

Ingress protection:

IP20

Pollution degree:

Corrosion protection:

ISA-S71.04 G3

Information

Overview Manuals Common Applications Product Precautions

ABB TB840A 3BSE037760R1 connects optical ModuleBus distribution to electrical S800 I/O clusters.

Extends local I/O distribution through a fiber-optic interface.
Supports separate optical lines for redundant modem arrangements.
Supervises the I/O ModuleBus and its power supply.
Provides an isolated power supply to connected I/O modules.

The optical and electrical interfaces are logically the same ModuleBus. Select TU840 or TU841 to match the installed redundant bus arrangement, and treat each electrical I/O cluster separately when planning optical distribution.

Important Notice: Confirm ABB TB840A 3BSE037760R1, the chosen MTU, optical-line separation, cluster allocation and I/O power demand. Check the actual mounting orientation and environmental conditions before commissioning.

Apter Power ABB TB840A 3BSE037760R1 Manuals and Guides

Apter Power ABB TB840A 3BSE037760R1 Product and System Technical Reference PDF Apter Power ABB TB840A 3BSE037760R1 Installation and Commissioning Workbook PDF

The first document presents model-specific technical data. The second provides a distinct workflow for optical topology, termination-unit selection, power budgeting and installation verification.

Distributed S800 I/O clusters

Carries ModuleBus communication to locally distributed I/O clusters over optical connections.

Redundant optical-line access

Connects redundant modems to separate optical lines feeding the same electrical ModuleBus.

I/O station expansion

Supports clustered distribution when one electrical ModuleBus cannot accommodate the station's I/O count.

Cluster power and bus supervision

Supports separate checks of the I/O communication path and the cluster power supply.

Read the applicable ABB S800 I/O installation instructions before work on ABB TB840A 3BSE037760R1. Confirm the optical topology, MTU arrangement and cluster power budget.

Keep redundant modems on different optical ModuleBus lines while connecting them to the same electrical ModuleBus.

Select TU840 for redundant dual ModuleBus or TU841 for redundant single ModuleBus; do not interchange the arrangements.

Limit each electrical ModuleBus to a maximum of 12 I/O modules.

Plan no more than seven clusters on the fiber-optic ModuleBus.

Treat the published 120 mA at 24 V as typical modem consumption, not total I/O-cluster demand.

Apply the 40-degree-C ambient maximum when mounting vertically.

Maintain IP20 installation conditions and non-condensing relative humidity within 5 to 95 percent.

Review both I/O ModuleBus supervision and power-supply supervision before accepting the cluster.

Technical notes

For ABB TB840A 3BSE037760R1, select TU840 for dual ModuleBus or TU841 for single ModuleBus in a redundant arrangement. Keep the electrical-bus module count and optical-cluster count within their separate limits, and distinguish modem current consumption from the complete I/O power budget.

FAQS

Should both ABB TB840A 3BSE037760R1 modems use the same optical line in a redundant arrangement?

No. ABB describes redundant TB840A units on different optical ModuleBus lines while both connect to the same electrical ModuleBus.
How should a station with more than 12 I/O modules be arranged around ABB TB840A 3BSE037760R1?

Do not extend one electrical ModuleBus beyond 12 I/O modules. Distribute additional I/O through optical ModuleBus clusters; ABB specifies up to seven clusters on the fiber-optic bus.
Which MTU fits a dual-ModuleBus redundant ABB TB840A 3BSE037760R1 installation?

TU840 is the listed MTU for redundant TB840/TB840A with dual ModuleBus. TU841 is the listed alternative for a single ModuleBus arrangement.
Does ABB TB840A 3BSE037760R1 translate between two independent communication protocols?

No. Its optical and electrical interfaces are logically the same ModuleBus. TB840A is a ModuleBus slave, not a general-purpose protocol gateway.
Can ABB TB840A 3BSE037760R1 be used with an HI controller?

Yes. ABB lists use with an HI controller. This entry describes controller compatibility; it does not assign a safety integrity level to the complete I/O installation.
What power-protection features are built into ABB TB840A 3BSE037760R1?

The module provides an isolated supply to the I/O modules and fused input power. These are separate features from its optical communication interface.
When checking ABB TB840A 3BSE037760R1, should diagnostics be limited to the optical path?

No. ABB lists supervisory functions for both the I/O ModuleBus and the power supply, so a cluster check must distinguish bus status from supply status.
What typical 24 V current should be allowed for ABB TB840A 3BSE037760R1 itself?

ABB publishes typical 24 V consumption of 120 mA. Treat this as the modem consumption, not as a published maximum or the total demand of all connected I/O modules.

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TB840A 3BSE037760R1

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Technical specifications for TB840A 3BSE037760R1

Technical specifications for TB840A 3BSE037760R1

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