Serviceline Industrial Sensors
Serviceline Explosion Protection

Com Unit for MODBUS TCP FB8211H0756.3

  • Interface between the I/O modules and the PCS/PLC
  • Com unit for 80 analog or 184 digital channels
  • Communication via MODBUS TCP
  • Installation in suitable enclosures in Zone 1
  • Module can be exchanged under voltage (hot swap)
  • HART communication via MODBUS TCP
  • Configuration via FDT 1.2 DTM
  • Non-volatile memory for configuration and parameter settings
  • Self configuration in redundant systems
  • Permanently self-monitoring
  • Outputs drive to safe state in case of failures

Please note: All product-related documents, such as certificates, declarations of conformity, etc., which were issued prior to the conversion under the name Pepperl+Fuchs GmbH or Pepperl+Fuchs AG, also apply to Pepperl+Fuchs SE.

Download the complete datasheet as a PDF:

Datasheet excerpt: Technical data of  FB8211H0756.3

Product Description
Com Unit for MODBUS TCP
Occupied slots2
Connectionbackplane bus
Rated voltage5 V DC , only in connection with the power supplies FB92**
Power dissipation2 W
Power consumption2.5 W
Fieldbus connection
Fieldbus typeMODBUS TCP
Ethernet Interface
Connection typewired to Ex e terminals via backplane
Transfer rate10 MBit/s
Station connectiondirectly to PCS or PLC or via hubs or switches
Bus lengthmax. 100 m (Ethernet standard)
AddressingIP address assigned via Ethernet
Ethernet addressIP V4 address (factory standard setting:, auto IP, DHCP)
Number of channels per stationmax. 80 analog, max. 184 digital
Supported I/O modulesall FB remote I/O modules
HART communicationvia Ethernet
Internal bus
Connectionbackplane bus
Redundancyvia left front connector
Service interface
Connectionvia right front connector in connection with service adapter SERV8001
LED indicationLED green (power supply): On = operating, fast flash = cold start
LED red (collective alarm): On = internal fault, flashing = no Modbus TCP connection
LED yellow (operating mode): flashing 1 (1:1 ratio) = active, normal operation; flashing 2 (7:1 ratio) = active, simulation
Directive conformity
Electromagnetic compatibility
Directive 2014/30/EUEN 61326-1:2013
Electromagnetic compatibilityNE 21
Degree of protectionIEC 60529
Fieldbus standardIEEE 802.3
Environmental testEN 60068-2-14
Shock resistanceEN 60068-2-27
Vibration resistanceEN 60068-2-6
Damaging gasEN 60068-2-42
Relative humidityEN 60068-2-78
Ambient conditions
Ambient temperature-40 ... 60 °C (-40 ... 140 °F)
Storage temperature-40 ... 85 °C (-40 ... 185 °F)
Relative humidity95 % non-condensing
Shock resistanceshock type I, shock duration 11 ms, shock amplitude 15 g, number of shocks 18
Vibration resistancefrequency range 10 ... 150 Hz; transition frequency: 57.56 Hz, amplitude/acceleration ± 0.075 mm/1 g; 10 cycles
frequency range 5 ... 100 Hz; transition frequency: 13.2 Hz amplitude/acceleration ± 1 mm/0.7 g; 90 minutes at each resonance
Damaging gasdesigned for operation in environmental conditions acc. to ISA-S71.04-1985, severity level G3
Mechanical specifications
Degree of protectionIP20 (module) , a separate housing is required acc. to the system description
Connectionvia backplane
Massapprox. 750 g
Dimensions57 x 107 x 132 mm (2.2 x 4.2 x 5.2 inch)
Data for application in connection with hazardous areas
EU-type examination certificatePresafe 19 ATEX 14058U
MarkingEx db eb q [ib] IIC Gb
Directive conformity
Directive 2014/34/EUEN IEC 60079-0:2018+AC:2020
EN 60079-1:2014
EN 60079-5:2015
EN 60079-7:2015+A1:2018
EN 60079-11:2012
International approvals
ATEX approvalPresafe 19 ATEX 14058U
IECEx approvalIECEx PRE 19.0013U
Approved forEx db eb q [ib] IIC Gb

General information
System informationThe module has to be mounted in appropriate backplanes (FB92**) in Zone 1, 2, or outside hazardous areas. Observe the corresponding EC-type examination certificate.
Supplementary informationEC-Type Examination Certificate, Statement of Conformity, Declaration of Conformity, Attestation of Conformity and instructions have to be observed where applicable. For information see


ECLASS 13.027210121
ECLASS 12.027210121
ECLASS 11.027210121
ECLASS 10.0.127210121
ECLASS 9.027210121
ECLASS 8.027210121
ECLASS 5.127210121
ETIM 9.0EC001485
ETIM 8.0EC001485
ETIM 7.0EC001485
ETIM 6.0EC001485
ETIM 5.0EC001485
UNSPSC 12.139121008

Details: FB8211H0756.3


The MODBUS TCP com unit forms the interface between the I/O modules on the backplane and the process control system.

It supports all single width and dual width I/O modules. Thereby signals from NAMUR sensors, mechanical contacts, high-power solenoid drivers, power relays, sounders, and alarm LEDs are transported to the higher-level bus system.

The com unit can be easily configured via DTM and supports redundancy as well as HART.

Informative Literature: FB8211H0756.3

Language Selection:
LiteratureLanguageFile TypeFile Size
Application Report - Communication Redundancy for Uninterrupted OperationENGPDF529 KB
Application Report - LB and FB Remote I/O Systems for Digitally Connecting Analog Field DevicesENGPDF208 KB
Application Report - Space Saving Extension for Existing PlantsENGPDF300 KB
Application Report - Using Remote I/O Systems for the Efficient Digitalization of PlantsENGPDF371 KB

Product Documentation: FB8211H0756.3

Language Selection:
System DescriptionsLanguageFile TypeFile Size
Supported I/O modulesENGPDF31 KB
Brief Instructions
Brief Instructions - Firmware updateENGPDF5602 KB
Safety and Security Documentation
Instruction manualENGPDF189 KB
Manual for LB8107*/FB8207*, LB8111*/FB8211* com unit for MODBUS RTU/TCPENGPDF6849 KB
FB Hardware ManualENGPDF9157 KB
Software Information
Software Product Note Remote I/O DTM / Softwareproduktschein Remote I/O DTMALLPDF256 KB

Design / Simulation: FB8211H0756.3

Language Selection:
CADLanguageFile TypeFile Size
3-D model / 3-D-ModellALLSTP7330 KB
CAD Portal / CAD PortalALLLINK---
CAE EPLAN Data Portal / CAE EPLAN Data PortalALLLINK---

Approvals: FB8211H0756.3

Language Selection:
CertificatesCertificate No.LanguageFile TypeFile Size
Brasil TUV Rheinland BrazilTÜV 19.0480 UALLPDF1258 KB
China SITIIAS CCC Ex Certificate2021322310004115 (Mannheim)ALLPDF2333 KB
Europe Presafe DNV GL II 2(1)G I (M1) ATEX II (1) DPresafe 19 ATEX 14058UALLPDF607 KB
Presafe DNV GL IECEx Certificate of ConformityIECEx PRE 19.0013UALLLINK---
Declaration of Conformity
EU-Declaration of conformityTDOC-4263DENGENGPDF1142 KB
UK-Declaration of conformityTDOC-6753_ENGENGPDF1110 KB

Software: FB8211H0756.3

Language Selection:
FirmwareRelease InfoFile TypeFile Size
Firmware for Comm Units 8x11 / Firmware für Buskoppler 8x117.53ZIP---
Firmware for Comm Units 8x11 / Firmware für Buskoppler 8x117.55ZIP1606 KB
Firmware for Comm Units 8x11 / Firmware für Buskoppler 8x117.56ZIP1615 KB
Service-Tool / Service-Tool3.00.0003ZIP5185 KB

Associated Products: FB8211H0756.3

Device DTM, For Remote I/O systems, Frame application, like e. g. PACTware, must be installed separatelypa