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8

INM9312-FB-ST-SS-1  

Oct 2008

8

8.1 

Examples of fieldbus segment topologies

Fieldbus segment with "daisy chain" structure. The trunk is looped through the Fieldbus Barrier.

Fieldbus segment in which the Fieldbus Barriers are connected to the trunk with junction boxes 
(T-connectors).

Fieldbus segment with star structure.

8.2 

Proof of intrinsic safety

The spurs comply with FISCO requirements, in accordance with IEC 60079-27.

Fieldbus

power

supply

Host

Host

redundant

Trunk length 1

Trunk length 2

Trunk length 3

Trunk length 4

Trunk

not Ex i

Spurs non Ex i

Spur

length

9312-FB

Fieldbus Barrier

9312-FB

Fieldbus Barrier

9312-FB

Fieldbus Barrier

9312-FB

Fieldbus Barrier

1

2

8

1

2

8

1

2

8

1

2

8

Fieldbus

power

supply

Host

Host

redundant

Trunk length 1

Trunk length 2

Trunk

not Ex i

<=

 1m

<=

 1m

<=

 1m

Spurs non Ex i

Spur

length

9312-FB

Fieldbus Barrier

9312-FB

Fieldbus Barrier

9312-FB

Fieldbus Barrier

9312-FB

Fieldbus Barrier

1

2

8

1

2

8

1

2

8

1

2

8

Figure 5:

Figure 6:

Figure 7:

Fieldbus

power

supply

Host

Host

redundant

Trunk length 1

Trunk length 2

Trunk length 3

Trunk length 4

Trunk

not Ex i

Spurs non Ex i

Spur

length

9312-FB

Fieldbus Barrier

9312-FB

Fieldbus Barrier

9312-FB

Fieldbus Barrier

9312-FB

Fieldbus Barrier

1

2

8

1

2

8

1

2

8

1

2

8

Содержание 9312-FB-ST-SS-SP

Страница 1: ...Instruction Manual INM9312 9312 FB ST SS SP Fieldbus Barrier ...

Страница 2: ...ion 4 3 1 Intended use 4 4 Functional description 5 4 1 Power management 5 5 Device construction 6 6 Transport storage and disposal 7 7 Mounting 7 8 Installation 7 8 1 Examples of fieldbus segment topologies 8 8 2 Proof of intrinsic safety 8 8 3 Cable lengths for trunk and spurs 9 8 4 Connections 10 8 5 Earthing Grounding 12 8 6 Fieldbus Terminating 15 9 Commissioning and operation 16 10 Maintenan...

Страница 3: ...toring applications in safe and hazardous areas Profibus PA One of the three vendor independent fieldbus variants supported by the Profibus organisation Profibus PA is intended for Process Automation and shares the same 31 25kbits s physical layer specification as FOUNDATION fieldbusTM H1 Trunk The main communication cable on a fieldbus segment It is typically the longest cable path between any tw...

Страница 4: ...ent to support up to 32 fieldbus devices but many systems limit this to 16 fieldbus devices DP PA coupler The DP PA coupler connects a Profibus PA segment with a Profibus DP The fieldbus power supply may be integrated in the DP PA coupler Master The Profibus master is generally a process control system PCS a programmable logic controller PLC or a PC Structure of a Foundation Fieldbus H1 segment St...

Страница 5: ... at the installation area at all times Observe safety instructions Observe national safety and accident prevention regulations Operate the equipment within its published specification Servicing maintenance work or repairs which are not described in the operating instructions must not be performed without prior agreement with the manufacturer Any damage may render explosion protection null and void...

Страница 6: ...fe field devices Overview of explosion protection for Fieldbus Barrier trunk and spurs Fieldbus Barrier Ex e Ex i Zone 0 Zone 1 Zone 2 non hazardous 9312 FB ST SS SP with stainless steel enclosure not permitted permitted permitted permitted Trunk not permitted Ex e Ex e permitted Spurs Ex ia Ex ia Ex ia permitted WARNING When installing in an Ex e enclosure Affix an indication label in accordance ...

Страница 7: ...he trunk is loaded with a maximum of only one short circuit current This minimises the current consumption of the trunk and the power loss of the Fieldbus Barrier under all operating conditions The total current available across all eight spurs is 160mA An average current of 20mA is therefore available to each spur which is adequate in practice as most fieldbus instruments require less than 20mA t...

Страница 8: ...r IP 30 2 Spur connections Ex i connection terminals for spurs 1 8 3 Indicator LEDs for spurs 1 8 4 Indicator LEDs for PWR power and ERR error 5 Bus bar for cable shields with movable terminals 6 Ground stud for earthing 7 Partition plate provides required seperation between Ex e and Ex i connection terminals 8 Storage position for terminator jumper 5 DEVICE CONSTRUCTION Figure 4 ...

Страница 9: ...er 8 3 Cable lengths Refer to Appendix 1 Technical Data for enclosure dimensions and spacing of mounting holes 8 INSTALLATION WARNING Incorrectly installed components Explosion protection cannot be guaranteed if the components are incorrectly installed Carry out the installation in strict accordance with the instructions and national safety and accident prevention regulations e g IEC 60079 14 Ex W...

Страница 10: ...ngth 4 Trunk not Ex i Spurs non Ex i Spur length 9312 FB Fieldbus Barrier 9312 FB Fieldbus Barrier 9312 FB Fieldbus Barrier 9312 FB Fieldbus Barrier 1 2 8 1 2 8 1 2 8 1 2 8 Fieldbus power supply Host Host redundant Trunk length 1 Trunk length 2 Trunk not Ex i 1m 1m 1m Spurs non Ex i Spur length 9312 FB Fieldbus Barrier 9312 FB Fieldbus Barrier 9312 FB Fieldbus Barrier 9312 FB Fieldbus Barrier 1 2 ...

Страница 11: ...or trunk and spurs IEC 61158 2 Annex B states that the maximum length for all cables per segment including all trunks and spurs must not exceed 1900 m In addition the maximum spur length depends on the total number of field devices per segment as follows In practice the actual trunk and spur lengths may be shorter because of voltage drops For a typical installation with up to two 9312 FB Fieldbus ...

Страница 12: ...nd non intrinsically safe cables must be separated in accordance with IEC 60079 14 Ex Foundation fieldbus H1 or Profibus PA Field devices Ex i Ex i Ex i Ex i SPUR 1 S SPUR 2 S SPUR 3 S SPUR 4 S Power Management S Foundation fieldbus H1 or Profibus PA Trunk not Ex i not Ex i T1 T2 T I I I I TRUNK IN S TRUNK OUT Ex i Ex i Ex i Ex i SPUR 5 S SPUR 6 S SPUR 7 S SPUR 8 S I I I I Figure 8 Circuit ...

Страница 13: ...ur connections can be worked on while power is connected to the Fieldbus Barrier Only one field device should be connected per spur connection Open enclosure Insert leads in the corresponding terminals Secure the terminals using an appropriate tool Close enclosure WARNING IP30 cover open on the non intrinsically safe trunk Explosion protection is not in force when the cover is open Power to the fi...

Страница 14: ... only normally at the fieldbus power supply In this case the trunk and spur cable shields are connected to each other at the Fieldbus Barrier and are not connected to ground in the field Cable connections to the Fieldbus Barrier should then be as shown above in Figure 10 Note In order to maintain a single point of grounding neither the Fieldbus Barrier module nor the cable shield earth bar should ...

Страница 15: ... to ground via 4 7μF capacitors that are internally connected between the S terminals of the trunk terminal block and the grounding stud 2 The connection between the cable shield busbar and local ground 3 can be omitted if the Fieldbus Barrier is installed into a steel enclosure using mounting screws as there is electrical continuity between the grounding stud 2 and the enclosure body Capacitive g...

Страница 16: ...o provide a consistent low impedance ground plane throughout the plant the fieldbus cable may be grounded at more than one point This is illustrated in Figure 12 where the trunk and spur cable shields are interconnected at the cable shield busbar 1 and the busbar is connected to local ground 2 Figure 12 Multiple point grounding ...

Страница 17: ...used Remove the factory provided jumper from its storage position 1 Insert the jumper in terminals 1 and 2 on the terminal block 2 Close screw tight the terminals The built in terminator is activated Fieldbus Barrier is not located at the end of the trunk The terminals on the terminal block are not to be used Ensure the factory provided jumper is in its storage position 1 The built in terminator i...

Страница 18: ... off properly The voltage on the trunk must be at least 16 V DC The voltage to the connected field devices must be at least 9 V DC Commissioning Observe the national regulations when commissioning Follow the IEC 60079 17 when conducting function inspections LED indicators functional description PWR green ERR red S1 S8 yellow Description OFF Voltage on trunk 16V ON Voltage on trunk OK 16V OFF OFF S...

Страница 19: ... glands Inspect housing for visible damage Check the seal between the enclosure and cover where appropriate Look for signs of moisture in the enclosure Check of operation within the published ambient temperature range 10 2 Repair work 10 3 Cleaning Clean with a damp cloth only using water or mild non abrasive non scratching cleaning agents Never use aggressive cleaning agents or solvents WARNING D...

Страница 20: ...6nF 2878nF Max connectable inductance Co for IIC IIB 0 58mH 2 9mH Max internal capacitance Ci 1 1nF Max internal inductance Li 0mH Insulation voltage Um 253V Power supply powered from the trunk Galvanic isolation to EN 50020 Ex i spurs to Ex e trunk 1 5kV test voltage Ex i spur to Ex i spur no isolation Data transmission between trunk and spurs passive no repeater function Trunk non intrinsically ...

Страница 21: ... terminals Error detection Spur short circuit 42mA Error indication each spur LED yellow S1 S8 flashing Error indication all spurs LED red ERR flashing Error indication Fieldbus Barrier LED red ERR Indication of spur causing overload LED yellow S1 S8 flashing quickly Electromagnetic Tested under the following standards and regulations compatibility EN 61326 IEC EN 61000 4 1 to 6 and 11 EN 55022 cl...

Страница 22: ... Stainless steel Degree of Protection IP 66 Cable entries Blanking plugs 8 x M 20 spurs stainless steel 2 x M 20 trunk stainless steel Breathing gland 1 x M 25 stainless steel Dimension Drawings all dimensions in mm 25 28 43 7 9312 FB ST 20 18 176 5 360 ...

Страница 23: ...21 INM9312 FB ST SS 1 Oct 2008 ...

Страница 24: ...lur Chennai 600 119 India Tel 91 0 44 24501660 24501857 Fax 91 0 44 24501463 E mail sales mtlindia com MTL Italia srl Via Cantù 11 I 20092 Cinisello Balsamo MI Italy Tel 39 0 2 61802011 Fax 39 0 2 61294560 E mail info mtl inst it MTL Instruments KK 3rd Floor Gotanda Masujima Building 1 8 13 Higashi Gotanda Shinagawa Ku Tokyo 141 0022 Japan Tel 81 0 3 5420 1281 Fax 81 0 3 5420 2405 E mail sales mtl...

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