Com Unit  Pepperl+Fuchs 254854
Com Unit  Pepperl+Fuchs 254854

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254854 Pepperl+Fuchs Com Unit

Manufacturer

Pepperl+Fuchs

Country

Germany

Part number

254854

Type

Com Unit

Description

  • Interface between the I/O modules and the PCS/PLC
  • Com unit for 80 analog or 184 digital channels
  • Communication via MODBUS RTU
  • Mounting in Zone 2, Class I/Div.2 or in the safe area
  • HART communication via service bus
  • 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
  • Module can be exchanged under voltage

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On request

Price: On request

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Specifications 254854

The MODBUS RTU 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.

Features 254854

Supply
Connectionbackplane bus
Rated voltage5 V DC , only in connection with the power supplies LB9***
Power dissipation1.8 W
Power consumption1.8 W
Fieldbus interface
Fieldbus typeMODBUS RTU
MODBUS RTU
Connection9-pin Sub-D socket via backplane
Baud ratemax. 38.4 kBit/s
Number of stations per bus linemax. 245 (MODBUS), max. 119 (service bus)
Number of channels per stationmax. 80 analog, max. 184 digital (standard configuration)
Number of stations per bus segmentmax. 31 (RS-485 standard)
Number of repeaters between Master and Slavemax. 3
Supported I/O modulesall LB remote I/O modules
Bus lengthmax. 1200 m (FOL, 38.4 kBd), max. 1200 m (copper cable, 38.4 kBd)
FOL (fiber optic link)additional hardware required
Addressingvia configuration software
MODBUS addressstandard compliant (factory standard setting: 126)
Service bus addressmax. 119 , redundancy address = base + 128 (automatic)
HART communicationvia service bus
Redundancysystem dependent
Internal bus
Connectionbackplane bus
Redundancyvia backplane
Indicators/settings
LED indicationLED P: (power supply): On = operating, fast flash = cold start LED 1: (Collective alarm): on = internal fault, flashing = no MODBUS RTU connection LED 2: (Status process bus): flashing = MODBUS receiving channel is active LED 3: (status service bus): flashing = service bus receive channel active LED 4: (operating mode): flashing 1 (1:1 ratio) = active, normal operation, flashing 2 (7:1 ratio) = active, simulation LED 5: (Status process bus): flashing = MODBUS response channel is active LED 6: (status service bus): flashing = service bus response channel active
Directive conformity
Electromagnetic compatibility
Directive 2014/30/EUEN 61326-1
Conformity
Electromagnetic compatibilityNE 21
Degree of protectionIEC 60529
Fieldbus standardIEC 61158-2
Environmental testEN 60068-2-14
Shock resistanceEN 60068-2-27
Vibration resistanceEN 60068-2-6
Damaging gasEN 60068-2-42
Relative humidityEN 60068-2-56
Ambient conditions
Ambient temperature-20 ... 60 °C (-4 ... 140 °F)
Storage temperature-25 ... 85 °C (-13 ... 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) , mounted on backplane
Connectionvia backplane
Massapprox. 120 g
Dimensions32.5 x 100 x 102 mm (1.28 x 3.9 x 4 inch)
Data for application in connection with hazardous areas
CertificatePF 08 CERT 1234 X
Marking II 3 G Ex nA IIC T4 Gc
Directive conformity
Directive 2014/34/EUEN 60079-0:2009 EN 60079-11:2007 EN 60079-15:2010
International approvals
ATEX approvalPF 08 CERT 1234 X
UL approvalE106378
Control drawing116-0321
Approved forcUL (Canada): CL I Zn. 2 IIC, IS circuits for CL I Zn. 0 IIC ULus (USA): CL I Div. 2 Grp. A, B, C, D, IS circuits for CL I, II, III Div. 1 Grp. A, B, C, D, E, F, G
IECEx approvalBVS 09.0037X
Approved forEx nA IIC T4 Gc
EAC approvalRussia: RU C-IT.MIII06.B.00129
Marine approval
Lloyd Register15/20021
DNV GL MarineTAA0000034
American Bureau of ShippingT1450280/UN
Bureau Veritas Marine22449/B0 BV
General information
System informationThe module has to be mounted in appropriate backplanes (LB9***) in Zone 2 or outside hazardous areas. Here, observe the corresponding declaration of conformity. For use in hazardous areas (e. g. Zone 2, Zone 22 or Div. 2) the module must be installed in an appropriate enclosure.
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 www.pepperl-fuchs.com.