Active Field Distributors Siemens

Обзор



Active Field Distributor AFD4

Active Field Distributor AFD8

Active Field Distributor AFD

Active field distributors (AFD) can be operated in environments in accordance with Division 2, Zone 2 or Zone 22. It is offered with the following models:

  • AFD4 or AFD4 FM with 4 spur line connections for 1 field device each
  • AFD8 with 8 spur line connections for 1 field device each

An AFD4/AFD4 FM can therefore connect up to 4 field devices, and an AFD8 can connect up to 8 standard-conform field devices, via short-circuit proof spur line connections to a fieldbus segment (line/ring) with automatic bus termination. This applies to both PA field devices (PROFIBUS PA) as well as FF field devices (FOUNDATION Fieldbus H1).

The fieldbus segment can be connected to a single or redundant PROFIBUS DP via a PA or FF router and can thus be seamlessly integrated into the SIMATIC PCS 7 process control system.

Up to 8 active field distributors AFD with a total of up to 31 connected field devices can be operated for each fieldbus segment. The number of field devices is also limited by the current consumption of the field devices. A maximum of 60 mA per spur line and a maximum of 1 A per segment is available for the field devices.

An AFD in a ring segment can be replaced during operation without failure of the segment.

For compliance with IP66 protection, it is necessary to protect unused spur line connections using plugs.

Differences between AFD4 and AFD4 FM

The AFD4 FM with cFMus approval is adapted to the special requirements for product models of the AFD4 active field distributor in the USA and Canada . The AFD4 FM features threaded plugs ex factory, because the cable glands of the AFD4 do not conform to the requirements of cFMus.

The threaded plugs for connecting the main and spur lines must be replaced by the cable glands and cables listed by UL or CSA. This must conform to the US National Electrical Code (NEC) and Canadian Electrical Code (CEC). The user is responsible for the selection and ordering.

Available suppliers for suitable cable glands:

  • Cooper Capri SAS
  • CMP products

Due to the larger bushing for the main line (M20 instead of M16), sheathed main line cables can also be used for AFD4 FM.

The relevant requirements of the US National Electrical Code (ANSI/NFPA‑70 NEC) must be met for the installation of the AFD4 FM.

Active field distributor AFDiS

Active field distributor AFDiS

The active field distributor AFDiS (Active Field Distributor intrinsically Safe) can be operated in environments in accordance with Ex zone 1/21 and 2/22. It can integrate up to 6 intrinsically-safe PA or FF field devices into a fieldbus segment (line/ring) via its intrinsically-safe, short-circuit-proof spur line connections. Instead of the spur line, it is also possible to use a subsegment for 3 to 4 devices with a max. length of 500 m at connection S1 of the AFDiS. The spur lines with Ex [ia] type of protection as well as the subsegment can be routed into Zone 0/20.

Up to 5 field distributors AFDiS with a total of up to 31 field devices can be operated in a fieldbus segment. The limitation to 5 field distributors is also mandatory for mixed operation of AFD and AFDiS.

The number of field devices per segment additionally depends on the current consumption of the devices. A current of 1 A is available for all field devices of the segment.

With the integrated repeater function, the AFDiS has the following advantages compared to the AFD:

  • Spur line lengths are independent of the total number of spur lines in the bus segment
  • Spur line lengths need not be be taken into account when determining the total length of the bus segment

Under the following conditions, an AFDiS in a ring segment can be replaced during operation without failure of the segment: Installation in Zone 2/22 or in a non-hazardous area.

For compliance with IP66 protection, it is necessary to protect unused spur line connections using plugs.

Active Field Splitter AFS

The active field splitter (AFS) connects a PA or FF line segment with a redundant coupler pair of a PA or FF router. The AFS interconnects the line segment with the respective active coupler.

The PA or FF line segment can be connected to the AFS via one or two (center feed) equivalent Y-connectors out of a total of 4. For the center feed, the line segment is connected via the two Y-connectors (bus termination switch on both FDC 157 couplers set to "OFF").

For compliance with IP66 protection, it is necessary to protect unused connections using plugs.

AFS: Active Field Distributor for FOUNDATION Fieldbus H1

Технические данные



Active Field Distributor AFD

 

General data

 

Connection of field devices

  • Standard-compliant field devices for PROFIBUS PA or FOUNDATION Fieldbus H1
  • Max. 4 per AFD4/AFD4 FM
  • Max. 8 per AFD8
  • Max. 31 per fieldbus segment
  • Operating environment up to Zone 2 or 22; Class I Zone 2/ Division 2
  • The max. current consumption of all fieldbus components of the fieldbus segment is 1 A

Degree of protection

IP66

Voltages, currents, potentials

 

Power supply

Via bus, no auxiliary power necessary

Rated supply voltage, permissible range

16 to 32 V DC

Reverse polarity protection (together with FDC 157)

Yes

Overvoltage protection

No

Current consumption

 
  • Current consumption at idle
 
  • AFD4/AFD4 FM

24 mA

  • AFD8

34 mA

  • Current consumption with connected field devices
 
  • AFD4/AFD4 FM

24 mA + total current of all field devices

  • AFD8

34 mA + total current of all field devices

  • Additional current consumption of the AFD at end of line (an open main line connection)

30 mA

  • Current consumption at max. power output per spur line
 
  • AFD4/AFD4 FM

264 mA

  • AFD8

514 mA

Power loss

 
  • AFD4/AFD4 FM

Min. 384 mW; max. 3.2 W

  • AFD8

Min. 544 mW; max. 4.1 W

Grounding

Direct, via grounding rail

Electrical isolation between main line and spur lines

No

Connections, interfaces

 

Main line

 

Number of connections

2

Cable bushings

 
  • AFD4

Cable glands M16

  • AFD4 FM

Terminal screws M20

  • AFD8

Cable glands M16

Interfaces

PROFIBUS PA and FOUNDATION Fieldbus H1

Automatic bus terminator

Yes

Spur lines

 

Number of connections

 
  • AFD4/AFD4 FM

4

  • AFD8

8

Cable bushings

 
  • AFD4

Cable glands M16

  • AFD4 FM

Terminal screws M16

  • AFD8

Cable glands M16

Short-circuit-proof

Yes

Intrinsically-safe acc. to FISCO

No

Current Imax (DC) on spur lines 1 to 4 (AFD4) or 1 to 8 (AFD8)

60 mA

Short-circuit current (test current)

6 mA

Debounce logic

Yes

No-load voltage

< 30 V

Current output to field devices

 
  • AFD4/AFD4 FM

Max. 240 mA

  • AFD8

Max. 480 mA

Status, interrupts, diagnostics

 

Status indicator

Yes

Diagnostics function

Yes

Diagnostics LED

Yes

Interrupts

No

Climatic conditions

 

Permissible operating temperature

-40 to +70 °C

Permissible storage/transport temperature

-40 to +85 °C

Relative humidity during operation

Max. 95%

Approvals for potentially explosive atmospheres

 
  • Gas

Zone 2

  • Dust

Zone 22

Dimensions and weight

 

Dimensions (W × H × D) in mm (without screwed glands)

 
  • AFD4/AFD4 FM

220 × 120 × 83

  • AFD8

360 × 120 × 83

Weight

 
  • AFD4/AFD4 FM

2 000 g

  • AFD8

3 000 g

Approvals, standards

 

AFD4 and AFD8

 
  • CE

According to 94/9/EG (formerly ATEX 100a), 2004/108/EG and 2006/95/EG

  • ATEX

II 3G Ex nA ic [ic] IIC T4 Gc
II 3D Ex tc [ic] IIIC T80°C Dc IP66

  • IECEx

IECEx DEK 12.0069X

  • KCC

Korea Certification

  • INMETRO

Ex nA [ic] IIC T4 Gc
Ex tc [ic] IIIC T80 °C

AFD4 FM

 
  • cFMus

FM Class 3600, 3611, 3810, ANSI/ISA 60079-0/-31, ANSI/ISA 60529, ANSI/NEMA250



Active Field Distributors AFDiS

 

General data

 

Connection of field devices

  • Standard-compliant field devices for PROFIBUS PA or FOUNDATION Fieldbus H1
  • Max. 6 per AFDiS
  • Max. 31 per fieldbus segment
  • Operating environment up to Zone 1 or 21; Class I Zone 1
  • The max. current consumption of all fieldbus components of the fieldbus segment is 1 A

Degree of protection

IP66

Voltages, currents, potentials

 

Power supply

Via bus, no auxiliary power necessary

Rated supply voltage, permissible range

16 to 32 V DC

Reverse polarity protection (together with FDC 157)

Yes; up to 1 A

Overvoltage protection

No

Current consumption

 
  • At 28 V input voltage

≤ 64 mA + (0.838 × aggregate current of all field devices)

  • At 24 V input voltage

≤ 67 mA + (1.008 × aggregate current of all field devices)

  • At 20 V input voltage

≤ 74 mA + (1.246 × aggregate current of all field devices)

Power loss

Min. 1.4 W; max. 5.9 W

Grounding

Direct, via connecting bar

Electrical isolation between main line and spur lines

Yes

Test voltage

2550 V DC, 2 s

Connections, interfaces

 

Main line

 

Number of connections

2

Cable bushings

Cable glands M16

Interfaces

PROFIBUS PA and FOUNDATION Fieldbus H1

Automatic bus terminator

Yes

Spur lines

 

Number of connections

6

Cable bushings

Cable glands M16

Short-circuit proof

Yes

Intrinsically-safe acc. to FISCO

Yes

Current Imax

 
  • on spur line S1

60 mA

  • on spur line S2 to S6

40 mA

  • in total for all field devices

180 mA

Short-circuit current (test current)

5 mA

Debounce logic

Yes

No-load voltage

Max. 15.3 V

Current output to field devices

Max. 260 mA

Status, interrupts, diagnostics

 

Status indicator

Yes

Diagnostics function

Yes

Diagnostics LED

Yes

Interrupts

No

Climatic conditions

 

Permissible operating temperature

-40 to +70 °C

Permissible storage/transport temperature

-40 to +85 °C

Relative humidity during operation

Max. 95 %

Approvals for potentially explosive atmospheres

 
  • Gas

Zone 1 and Zone 2

  • Dust

Zone 21 and Zone 22

Dimensions and weight

 

Dimensions (W × H × D) in mm

380 × 85 × 170

Weight

4 500 g

Approvals, standards

 
  • CE

According to 94/9/EG (formerly ATEX 100a), 2004/108/EG and 2006/95/EG

  • ATEX

Ex e ib mb [ia IIC Ga] [ia IIIC Da] IIC T4 Gb
Ex nA ic [ia IIC Ga] [ia IIIC Da] IIC T4 Gc
Ex t IIIC T80 °C Db IP66
KEMA 10 ATEX 0055

  • IECEx

IECEx KEM 10.0026

  • KCC

Korea Certification

  • INMETRO

Ex e ib mb [ia IIC Ga] [ia IIIC Da] IIC T4 Gb
Ex nA ic [ia IIC Ga] [ia IIIC Da] IIC T4 Gc
Ex tb IIIC T80 °C IP66
(‑40 to +70 °C)

  • NEPSI

Ex e ib mb [ia IIC GA] [iaD] IIC T4 Gb;
Ex nA ic [ia IIC Ga] [iaD] IIC T4 Gc; DIP A21 T80°C IP66



Active Field Distributors AFS

 

General data

 

Connection of field devices

  • 1 fieldbus segment with max. 31 field devices
  • Operating environment up to Zone 2 or 22; Class I Zone 2/ Division 2
  • The max. current consumption of all fieldbus components of the fieldbus segment is 1 A

Degree of protection

IP66

Voltages, currents, potentials

 

Power supply

Via bus, no auxiliary power necessary

Rated supply voltage, permissible range

16 to 32 V DC

Reverse polarity protection (together with FDC 157)

Yes

Overvoltage protection

No

Current consumption at idle

54 mA

Power loss

Min. 864 mW; max. 2.13 W

Output current for supplying all field devices of the fieldbus segment (for dimensioning the device configuration)

1 A

Grounding

Direct, via connecting bar

Connections, interfaces

 

Main lines to the FDC 157 couplers

 

Number of connections

2

Cable bushings

Cable glands M16

Automatic bus terminator

No

Maximum permissible continuous main line current

1 A

Y-connections for fieldbus line segment

 

Number of connections

1 or 2 (with center feed)

Cable bushings

Cable glands M16

Interfaces

PROFIBUS PA and FOUNDATION Fieldbus H1

Short-circuit proof (together with FDC 157)

Yes

Intrinsically-safe acc. to FISCO

No

Current Imax on Y (limited by FDC 157)

1 A

Debounce logic

No

Continuous output voltage

Max. 32 V

Current output to field devices

Max. 1 A

Status, interrupts, diagnostics

 

Status indicator

Yes

Diagnostics function

Yes

Diagnostics LED

Yes

Interrupts

No

Climatic conditions

 

Permissible operating temperature

-40 to +70 °C

Permissible storage/transport temperature

-40 to +85 °C

Relative humidity during operation

Max. 95 %

Approvals for potentially explosive atmospheres

 
  • Gas

Zone 2

  • Dust

Zone 22

Dimensions and weight

 

Dimensions (W × H × D) in mm (without screwed glands)

220 × 120 × 83

Weight

2 000 g

Approvals, standards

 
  • CE

According to 94/9/EG (formerly ATEX 100a), 2004/108/EG and 2006/95/EG

  • ATEX

II 3G Ex nA IIC T4 Gc
II 3D Ex tc IIIC T80°C Dc IP66

  • IECEx

IECEx DEK 12.0069X

  • KCC

Korea Certification