Pepperl+Fuchs LB Series

Questions and Answers:

J
Joanne NealSep 10, 2025
How to fix communication error on the fieldbus in Pepperl+Fuchs LB?
- C
  Cheryl HullSep 12, 2025
  To resolve a communication error on the fieldbus with Pepperl+Fuchs I/O Systems, ensure the cables are securely connected. Verify the transmitting and receiving lines are correctly wired and not swapped. Confirm that the nodes are arranged in a linear fashion without any branches, as a star-shaped layout is not permitted. Activate the terminator, ensuring there are exactly two terminators per segment, one at the start and one at the end. In the configuration software, check that the selected address matches the remote I/O station address. Also, verify whether the master read cycle and the com unit watchdog are coordinated within the configuration software.
T
Travis MitchellSep 12, 2025
What to check if I/O module is reported to be faulty in Pepperl+Fuchs I/O Systems?
- J
  John PrestonSep 12, 2025
  If an I/O module is reported as faulty in Pepperl+Fuchs I/O Systems, verify that the correct I/O module is plugged in. Also, check that the green LED on the I/O module is lit and that the I/O module is correctly plugged in.
V
valenciasharonSep 14, 2025
Why does the input module sporadically deliver no measured values in Pepperl+Fuchs LB?
- B
  brian39Sep 14, 2025
  If the input module sporadically delivers no measured values in Pepperl+Fuchs I/O Systems, it could be due to interrupted communication with the com unit. Check that the I/O module is plugged into the backplane properly.
J
Joseph HallSep 16, 2025
What to do if software cannot locate a com unit when establishing connection in Pepperl+Fuchs LB?
- N
  nicole18Sep 16, 2025
  If the software cannot locate a com unit when establishing the connection with Pepperl+Fuchs I/O Systems, check that the com unit is plugged in correctly.

Pepperl+Fuchs LB Series Specifications

General

Mounting	DIN Rail
Zone	Zone 1, Zone 2
Power Supply	24 V DC
Protection Class	IP20
System Type	Remote I/O System
Communication Protocols	PROFIBUS DP
I/O Modules	Analog, Digital
Signal Type	Analog, Digital
Number of Channels	Varies by module
Intrinsic Safety	Yes
Isolation	Channel to channel, channel to system
Output Current	Varies by module (e.g., 0.5 A, 2 A)
Connection Type	Screw terminals
Dimensions	Varies by module
Weight	Varies by module
Temperature Range	-20 ... 60 °C (-4 ... 140 °F)

Summary

Introduction to LB Remote I;O System

Content of this Document

Details information required to use the finished device or system in product life cycle phases.

Target Group and Personnel

Defines responsibilities and training requirements for personnel handling the product.

Symbols Used in LB Remote I;O Manual

Product Specifications for LB Remote I;O System

Prerequisites for Operating the Remote I;O Unit

Details requirements for operating the LB remote I/O system in hazardous and non-hazardous areas.

Introduction to Product Specifications

Explains Remote I/O stations as interfaces and lists supported bus systems for communication.

LB Remote I;O System Components Overview

LB Remote I;O System Backplanes

LB Remote I;O System: Modules and Power Supplies

LB Remote I;O System Accessories

Installation of LB Remote I;O System

Surrounding Enclosure Requirements

Details enclosure requirements for Equipment Protection Level Gc and non-hazardous areas.

Mounting the Backplane

Provides instructions for mounting the backplane horizontally or vertically on a DIN mounting rail.

Connections and Fuses

Specifies required fuses and provides warnings for electrical connections.

Installation of LB9022-LB9029 Backplanes

Sub-D Plug Pinning for LB Remote I;O System

Activating Fieldbus Terminators

X40 Terminal Assignment for Booster Connection

S1 Switch and X3 Terminal for Deactivation Control

Control Input X3 Settings and Backplane Control

Installation of LB9022 S;LB9024 S Backplanes

Installation of LB9035 A Backplane

X4 Terminal Assignment for Fieldbus Connection

X3 Terminals and S1 Function Switches for I;O Control

Inserting and Removing I;O Modules

Installing I;O Modules

Step-by-step guide for installing I/O modules onto the backplane, including separation walls.

Removing I;O Modules

Instructions for safely removing I/O modules from the backplane.

Installing the Separation Wall

Mounting on a Backplane without a Label Carrier

Procedure for mounting a separation wall on a backplane without a label carrier.

Mounting on a Backplane with a Label Carrier

Procedure for mounting a separation wall on a backplane with a label carrier.

Field Wiring for LB Remote I;O System

Terminal Blocks for Field Connections

Describes terminal blocks (screw, front screw, spring) for making field connections.

Connection Data for Terminal Blocks

Connection Data for Spring Terminals (2 x8)

Installing Field Wiring Safely

Coding I;O Modules and Terminals

Coding Connections

Explains how to use coding pins to ensure correct assignment of terminals to I/O modules.

Line Fault Detection Functionality

Line Fault Detection for LB103

Details line fault detection for LB1*03* modules, including rotational direction detection.

Line Fault Detection for LB1007, LB108, LB109*

Details line fault detection for LB1007*, LB1*08*, LB1*09* modules, including 24V/5V input usage.

Line Fault Detection for LB2* Modules

Cold Junctions for Thermocouple Measurements

External Cold Junctions

Describes using external cold junctions for thermocouple measurements and configuration.

Line Resistance Compensation for Resistance Thermometers

Pt100 Short Circuit Method

Procedure to measure and compensate line resistance using a Pt100 short circuit.

Using a Calibrating Resistor

Procedure to measure and compensate line resistance using a calibrating resistor.

Strain Gauge Measurement with LB Modules

Configuring I;O Modules for Strain Gauge Measurement

Steps to configure LB modules for strain gauge measurements using analog outputs and inputs.

Status Monitoring of Output Switch-off

Configuring I;O Modules for Status Monitoring

Instructions for configuring I/O modules for status monitoring of output shutdown.

Redundancy Features in LB Remote I;O System

Basic Principles of Redundancy

Explains the use of redundancy for ensuring operation despite component failure.

Media Redundancy

Describes media redundancy with voter, master, and redundant fieldbus cables.

Application Redundancy Configuration

Fieldbus Connection for LB Remote I;O System

Connection Guidelines

Provides guidelines for connecting fieldbuses, including explosion risks and accessory use.

Cable Lengths for Fieldbus Systems

Lists maximum cable lengths for various bus systems based on transfer rates.

Extending Fieldbus Cable Lengths

Fieldbus Terminator Configuration

Terminator Types and Line Types

Details terminator types (R values) for different line types (A, B, service bus).

Potential Equalization and Shielding

Interference Reduction Techniques

Explains how twisted-pair cables and shielding reduce electromagnetic interference.

Wiring Safety and EMC Considerations

System Expansion for LB Remote I;O

Adding I;O Modules and Hot Configuration

Details adding I/O modules and using Hot Configuration in Run (HCIR) for seamless updates.

Extending the Fieldbus

Explains how to extend the fieldbus cable, requiring terminator removal and redundant systems.

Commissioning the LB Remote I;O System

Electrical Testing of Connections

Tests physical connection integrity of fieldbus and service bus segments with voltage measurements.

Physical Remote I;O Station Connection Test

Tests physical connection of remote I/O stations, including explosion risk warnings.

Configuration of LB Remote I;O Stations

Service Bus Connection via RS-232

Details connecting the remote I/O unit to a PC via an RS-232 interface converter.

Service Bus Connection via USB

Instructions for connecting the remote I/O unit to a PC via a USB converter.

Startup Phase for LB Remote I;O System

Sequential Station Startup

Recommends connecting remote I/O stations sequentially to the master for stable operation.

Temporary Overload of Power Supply

Addresses power supply overload by limiting certain I/O modules during the startup phase.

Operation of LB Remote I;O System

Operational Safety and Module Swapping

Emphasizes safety during operation, especially when swapping I/O modules, and accessing operational data.

Troubleshooting LB Remote I;O System Communication Errors

Communication Errors on Fieldbus

Provides remedies for communication errors occurring on the fieldbus connection.

Communication Errors on Service Bus

Provides remedies for communication errors on the service bus connection.

Troubleshooting New I;O Stations and Software Issues

Addresses issues with new stations on the bus and software failing to locate com units.

Troubleshooting Redundancy Faults

Troubleshooting Signal Faults

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