Siemens SIMATIC AFD4 User manual

Active field distributors AFD4, AFD4
(FM), AFD8 and AFS
___________________
___________________
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SIMATIC
Bus links
Active field distributors AFD4, AFD4
(FM), AFD8 and AFS
Product Information
02/2015
A5E03775304
-AC
Introduction
1
Installing and connecting
2
Technical specifications
3

Siemens AG
Division Process Industries and Drives
Postfach 48 48
90026 NÜRNBERG
GERMANY
A5E03775304-AC
Ⓟ
02/2015 Subject to change
Copyright © Siemens AG 2012 - 2015.
All rights reserved
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by
personnel qualified
for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.

Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
Product Information, 02/2015, A5E03775304-AC 3
Table of contents
1 Introduction............................................................................................................................................. 5
1.1 Security information ..................................................................................................................5
1.2 Active field distributor AFD4, AFD4 (FM) and AFD8 ................................................................6
1.3 Active field splitter (AFS)...........................................................................................................7
1.4 Configuration with active field distributors ................................................................................8
2 Installing and connecting....................................................................................................................... 11
2.1 Screwing AFD4 / AFD4 (FM) / AFD8 and AFS to the substrate.............................................11
2.2 Grounding AFD4 / AFD4 (FM) / AFD8 and AFS.....................................................................12
2.3 Safety instructions for connection...........................................................................................14
2.4 Connecting the field bus to the active field distributors AFD4 / AFD4 (FM) / AFD8 ...............19
2.5 Connecting the field bus to the active field distributor AFS ....................................................23
2.6 Maintaining and cleaning AFD4 / AFD4 (FM) / AFD8 and AFS .............................................26
2.7 Replacing AFD4 / AFD4 (FM) / AFD8 and AFS .....................................................................27
2.8 LED displays of the active field distributor AFD4 / AFD4 (FM) / AFD8 ..................................29
2.9 LED displays of the active field splitter (AFS).........................................................................30
3 Technical specifications ........................................................................................................................ 31
3.1 Standards and approvals for active field distributors AFD4 / AFD8 and AFS ........................31
3.2 Standards and approval of active field distributor AFD4 (FM)................................................33
3.3 Technical specifications of active field distributors AFD4 (6ES7157-0AG81-0XA0)..............33
3.4 Technical specifications for active field distributor AFD4 (FM) (6ES7655-5DX40-1AA1) ......36
3.5 Technical specifications of active field distributors AFD8 (6ES7157-0AG82-0XA0)..............38
3.6 Technical specification of active field distributors AFS (6ES7157-0AG80-0XA0)..................40
3.7 Abbreviations ..........................................................................................................................42
Index..................................................................................................................................................... 43
Tables
Table 2- 1 Terminal assignment on the active field distributor AFD4 / AFD4 (FM) / AFD8 ......................2020
Table 2- 2 Terminal assignment on the active field distributor AFS .........................................................2424
Table 2- 3 Permitted activities in hazardous areas ...................................................................................2626
Table 2- 4 Status and error messages......................................................................................................2929
Table 2- 5 Status and error messages......................................................................................................3030

Table of contents
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
4Product Information, 02/2015, A5E03775304-AC
Table 3- 1 Industrial use............................................................................................................................3232
Figures
Figure 1-1 Example: Configuration with ring redundancy with AFD4 field distributors .................................88
Figure 2-1 Example: Direct grounding of AFD4 / AFD4 (FM)....................................................................1313
Figure 2-2 Schematic representation of the interior (AFD4) .....................................................................1414
Figure 2-3 Schematic representation of the interior (AFD4 (FM)).............................................................1515
Figure 2-4 Rules for connecting the main lines .........................................................................................1717
Figure 2-5 Connections of AFD4 ...............................................................................................................1919
Figure 2-6 Connections of AFD4 (FM) ......................................................................................................1919
Figure 2-7 Connections of AFD8 ...............................................................................................................1919
Figure 2-8 Terminal block AFD4 / AFD4 (FM) / AFD8 ..............................................................................2020
Figure 2-9 Preparing the bus cable ...........................................................................................................2222
Figure 2-10 AFS connections ......................................................................................................................2323
Figure 2-11 AFS terminal block ...................................................................................................................2323
Figure 2-12 Preparing the bus cable ...........................................................................................................2525
Figure 2-13 LED display AFD4 / AFD4 (FM) / AFD8...................................................................................2929
Figure 2-14 LED display AFS ......................................................................................................................3030

Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
Product Information, 02/2015, A5E03775304-AC 5
Introduction
1
This product information contains important information on the active field distributors AFD4,
AFD4 (FM), AFD8 and AFS. It should take priority over information provided in manuals and
catalogs if conflicts occur.
In addition to this product information, you need the associated manual "Bus links. DP/PA
coupler, active field distributors, DP/PA Link and Y Link". It is available for download from the
Internet (http://support.automation.siemens.com/WW/view/en/1142696).
Scope
In this product information, we describe the specifics of the active field distributors, which
can can be operated on the PA and FF field buses:
●AFD4, order number 6ES7157-0AG81-0XA0
●AFD4 (FM), order number 6ES7655-5DX40-1AA1
●AFD8, order number 6ES7157-0AG82-0XA0
●AFS, order number 6ES7157-0AG80-0XA0
Note
The devices listed above are functionally compatible with the previous models AFD with
order number 6ES7157
-0A
F
81-0XA0 or AFS with order number 6ES7157-0A
F
82-0XA0.
Keep in mind the larger dimensions when replacing the devices.
Setting the dimensions of plants
When setting the dimensions of plants with active field distributors, use the "SIMATIC
Fieldbus Calculator". It is available for download from the Internet
(http://support.automation.siemens.com/WW/view/en/53842953).
1.1
Security information
Siemens provides products and solutions with industrial security functions that support the
secure operation of plants, solutions, machines, equipment and/or networks. They are
important components in a holistic industrial security concept. With this in mind, Siemens’
products and solutions undergo continuous development. Siemens recommends strongly
that you regularly check for product updates.
For the secure operation of Siemens products and solutions, it is necessary to take suitable
preventive action (e.g. cell protection concept) and integrate each component into a holistic,
state-of-the-art industrial security concept. Third-party products that may be in use should

Introduction
1.2 Active field distributor AFD4, AFD4 (FM) and AFD8
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
6Product Information, 02/2015, A5E03775304-AC
also be considered. You can find more information about industrial security on the Internet
(http://www.siemens.com/industrialsecurity).
To stay informed about product updates as they occur, sign up for a product-specific
newsletter. You can find more information on the Internet
(http://support.automation.siemens.com).
1.2
Active field distributor AFD4, AFD4 (FM) and AFD8
Active field distributor AFD4 / AFD4 (FM) / AFD8
Field devices such as measuring instruments, sensors and actuators can be connected to
the active field distributors AFD4 / AFD4 (FM) / AFD8.
In conjunction with 2 FDC 157 couplers, the field distributors AFD4 / AFD4 (FM) / AFD8
enable operation of a
ring redundancy
. You can use the following field distributors in a
segment:
●Up to 8 field distributors when using AFD4 / AFD4 (FM) / AFD8 only
●Up to 5 field distributors with mixed use of at least one AFDiS and other AFD4 / AFD4
(FM) / AFD8 field distributors
The total number of field devices in a segment is 31 devices and it is limited by a maximum
of 60 mA per spur line.
Functions
●Connection of field devices for a field bus in line or ring topology
●Automatic bus termination
●Automatic isolation of faulty segments
●Automatic connection of isolated segments after fault rectification
●Extending a segment during operation
●Short-circuit-proof spur lines
Properties
●AFD4: 2 M16 cable glands for the main line
●AFD8: 2 M16 cable glands for the main line
●AFD4 (FM): 2 M20 blanking caps for the main line
●AFD4: 4 M16 cable glands for up to 4 field devices
●AFD8: 8 M16 cable glands for up to 8 field devices
●AFD4 (FM): 4 M16 blanking caps for up to 4 field devices
●Connection using screw-type terminals
●Reverse polarity protection connections

Introduction
1.3 Active field splitter (AFS)
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
Product Information, 02/2015, A5E03775304-AC 7
●Debounce logic reduces interference when connecting and disconnecting the spur lines
●IP30 covers for connections of the main lines
●Diagnostics using LED displays
●Power supply by means of the field bus
●Screw gland on substrate
●Grounding terminal outside
●Degree of protection IP66
●Protective coating of printed circuit board
1.3
Active field splitter (AFS)
Active field splitter (AFS)
The AFS field distributor connects 2 FDC 157 couplers to a field bus segment. It enables
operation of
coupler redundancy
on the line this way.
The total number of field devices on the line is 31 devices limited by a maximum current of 1
A.
Functions
If a fault occurs, the main line automatically switches to the redundant FDC 157 coupler.
Properties
●2 M16 cable glands for the main line
●4 M16 cable glands for the segment
●Connection using screw-type terminals
●Reverse polarity protection connections
●IP30 covers for connections of the main lines
●Diagnostics using LED displays
●Power supply by means of the field bus
●Power failure backup in case of failure of a main line
●Screw gland on substrate
●Grounding terminal outside
●Degree of protection IP66
●Protective coating of printed circuit board

Introduction
1.4 Configuration with active field distributors
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
8Product Information, 02/2015, A5E03775304-AC
Note
Despite the IP30 covers, the requirements for Zone 2 are not met because the AFS is
always connected directly to the FDC 157 coupler.
See also
Safety instructions for connection (Page 14)
1.4
Configuration with active field distributors
Installation with ring redundancy
The graphic below provides an example of the configuration with ring redundancy. The
symbols for AFD4 field distributors are shown without cable glands for the main lines to
maintain clarity.
Figure 1-1 Example: Configuration with ring redundancy with AFD4 field distributors

Introduction
1.4 Configuration with active field distributors
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
Product Information, 02/2015, A5E03775304-AC 9
Reference
You can find additional configuration variants in the application planning section of the "Bus
Couplings" manual. DP/PA Coupler, Active Field Distributors, DP/PA Link and Y Link"
manual on the Internet (http://support.automation.siemens.com/WW/view/en/1142696).

Introduction
1.4 Configuration with active field distributors
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
10 Product Information, 02/2015, A5E03775304-AC

Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
Product Information, 02/2015, A5E03775304-AC 11
Installing and connecting
2
2.1
Screwing AFD4 / AFD4 (FM) / AFD8 and AFS to the substrate
Mounting position
The active field distributors AFD4 / AFD4 (FM) / AFD8 and AFS are preferably screwed in
place on a flat surface with the connections at the bottom.
Requirement
●The substrate must be level, with load-bearing capacity, and it must be vibration free.
●Select appropriate fixing accessories for the substrate.
●There should be a clearance of at least 60 mm below the modules for the connection of
main lines and spur lines.
●You can find the drill hole spacing on the back of the enclosure base (see Technical
specifications).
Tools required
●Phillips screwdriver size 4
●4 M6 fixing screws; dowels depending on the substrate
●Screwdriver suitable for the fixing screws used
Procedure
WARNING
Risk of injury!
There is risk of injury due to heavy weight of the field distributor.
Hold the device firmly in your hand during installation.
1. Remove the 4 screws of the enclosure cover with a Phillips screwdriver.
2. Screw the lower part of the enclosure tightly to the substrate with 4 fixing screws. The
torque depends on the fixing screws used.
3. Screw the enclosure cover onto the upper part of the enclosure with the 4 Phillips-recess
screws. Torque 2.4 Nm.

Installing and connecting
2.2 Grounding AFD4 / AFD4 (FM) / AFD8 and AFS
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
12 Product Information, 02/2015, A5E03775304-AC
2.2
Grounding AFD4 / AFD4 (FM) / AFD8 and AFS
Requirement
●Active field distributor is mounted.
Required accessories
●Grounding cable, at least 4.0 mm2
Grounding the active field distributors AFD4 / AFD4 (FM) / AFD8 and AFS
1. Strip the insulation of the grounding cable to 8 mm.
2. Attach the grounding cable to the grounding terminal of the field distributor. Torque 2.0
Nm.
3. Connect the grounding cable to the equipotential bonding PA in accordance with
EN 60079-14.
DANGER
Explosion hazard
Sparks may occur when connecting in some circumstances.
Never perform the work under explosive conditions!
Note
Read the safety instructions in the section
Safety instructions for connection (Page 14).
Equipotential bonding PA
In hazardous areas, you need to implement equipotential bonding PA according to
IEC 60079-14.
Connect the equipotential bonding PA to the shielding of the bus lines.
The best EMC protection is achieved with direct grounding for active field distributors.

Installing and connecting
2.2 Grounding AFD4 / AFD4 (FM) / AFD8 and AFS
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
Product Information, 02/2015, A5E03775304-AC 13
Direct grounding
The shielding of the bus lines is grounded directly in the hazardous area and in the safe
area. This is possible if the equipotential bonding PA runs from the FDC 157 couplers (in the
safe area) to the field devices (in hazardous areas), which means if a corresponding
equipotential bonding conductor is installed.
Note
Direct grounding
The braided shielding of the connection cables must be guided under the shielding clamps of
the active field distributors.
Example: Direct grounding of AFD4 / AFD4 (FM)
Figure 2-1 Example: Direct grounding of AFD4 / AFD4 (FM)

Installing and connecting
2.3 Safety instructions for connection
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
14 Product Information, 02/2015, A5E03775304-AC
2.3
Safety instructions for connection
Safety information
Note
When laying cables and wiring, make sure that you adhere to the installation regulations in
accordance with EN
60079-14 and any regulations specific to your country.
DANGER
Explosion hazard
Sparks may occur when connecting in some circumstances.
Therefore, use a
non-magnetic
screwdriver when connecting the cables.
DANGER
Explosion hazard
A tensile load on the screws of the AFD4, AFD4 (FM), AFD8 and AFS can impair the
degree of protection and is not permitted.
Implement a fixed Installation for inlet of the cable!
Schematic representation of the interior
Figure 2-2 Schematic representation of the interior (AFD4)

Installing and connecting
2.3 Safety instructions for connection
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
Product Information, 02/2015, A5E03775304-AC 15
Figure 2-3 Schematic representation of the interior (AFD4 (FM))
IP30 cover for AFD4 / AFD4 (FM) / AFD8
The connections of the main cables inside the enclosure of the AFD4 / AFD4 (FM) / AFD8
are sealed with an IP30 cover. Opening the IP30 cover switches off the voltage supply to the
terminals and the feed lines.
In the hazardous area
Zone 2
, you are permitted to open the IP30 cover during operation for
visual inspection.
NOTICE
IP30-Cover with AFS
Despite the IP30 cover, the requirements for Zone 2 are not met because the AFS is
always connected directly to the FDC 157 coupler.
Zone 2: Disconnecting the main line / connecting the main line to AFD4 / AFD4 (FM) / AFD8
DANGER
Explosion hazard
In hazardous area
Zone 2
, you are not permitted to disconnect the main line from an AFD4
/ AFD4 (FM) / AFD8 during operation if it is connected
directly
to an FDC 157 coupler or an
AFS.
Before you start the work, disconnect the voltage supply to the FDC 157 coupler(s).
In hazardous area
Zone 2
, you are permitted to disconnect a main line from an AFD4 / AFD4
(FM) / AFD8 during operation if it connects two AFD4 / AFD4 (FM) / AFD8.

Installing and connecting
2.3 Safety instructions for connection
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
16 Product Information, 02/2015, A5E03775304-AC
Zone 2: Disconnecting the main line / connecting the main line to AFS
DANGER
Explosion hazard
In hazardous area
Zone 2
, you are not permitted to disconnect lines from an AFS during
operation.
Before you start the work, disconnect the FDC 157 coupler(s) from the voltage.

Installing and connecting
2.3 Safety instructions for connection
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
Product Information, 02/2015, A5E03775304-AC 17
Rules for connecting the main lines
The following examples illustrate the rules that you must observe when connecting main
lines.
Figure 2-4 Rules for connecting the main lines

Installing and connecting
2.3 Safety instructions for connection
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
18 Product Information, 02/2015, A5E03775304-AC
Rules
Observe the following rules when connecting the main lines in hazardous area Zone 2:
No.
Rule
①
Disconnect FDC from the voltage when disconnecting the line (1) on AFD4 / AFD4
(FM) / AFD8 / AFDiS
②
Disconnect FDC 1 from the voltage when disconnecting the line (1) on AFD4 /
AFD4 (FM) / AFD8 / AFDiS
Disconnect FDC 2 from the voltage when disconnecting the line (2) on AFD4 /
AFD4 (FM) / AFD8 / AFDiS
③
Disconnect FDC
1 and FDC 2 from the voltage when disconnecting the line (1) on
AFS and AFD4 / AFD4 (FM) / AFD8 / AFDiS
The following applies to all configurations:
The lines (3) can be connected during operation
(each highlighted in green in the figure)
The spur lines S1 to S8 can always be connected during operation.
Marking the main lines
Note
Mark the main lines on the field distributors which you are not permitted to disconnect during
operation.
Mark in your plant:
•
The main lines on AFD4 / AFD4 (FM) / AFD8 that come directly from the FDC coupler
•
The main lines on AFD4 / AFD4 (FM) / AFD8 that come directly from the AFS
•
The main lines on AFS that come directly from the AFD4 / AFD4 (FM) / AFD8
(each highlighted in red in the figure)

Installing and connecting
2.4 Connecting the field bus to the active field distributors AFD4 / AFD4 (FM) / AFD8
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
Product Information, 02/2015, A5E03775304-AC 19
2.4
Connecting the field bus to the active field distributors AFD4 / AFD4
(FM) / AFD8
Introduction
The bus cables of the AFD4 / AFD4 (FM) / AFD8 field distributors are fed into the enclosure
via cable glands:
●The main line using T1 and T2
●The spur lines to the field devices using S1 to S4 / S8
Figure 2-5 Connections of AFD4
Figure 2-6 Connections of AFD4 (FM)
Figure 2-7 Connections of AFD8

Installing and connecting
2.4 Connecting the field bus to the active field distributors AFD4 / AFD4 (FM) / AFD8
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
20 Product Information, 02/2015, A5E03775304-AC
Terminal assignment
Connect the wires of the bus cables using the screw-type terminals on the terminal block.
Figure 2-8 Terminal block AFD4 / AFD4 (FM) / AFD8
Table 2- 1 Terminal assignment on the active field distributor AFD4 / AFD4 (FM) / AFD8
Connection
Terminal
Assignment
T1, T2 Main line
+
Data line
-
Data line
S1 to S4 / S8 Spur line to the field devices
+
Data line
-
Data line
Basic procedure
1. Prepare the bus cable.
2. Connect the bus cable:
–Open the field distributor.
–Connect the wires to the terminal block.
–Close the field distributor.
Preparation of the AFD4 (FM)
Note
Replace blanking caps with UL
- or CSA-approved lead-throughs for connection of additional
field devices.
The customer must use a screwed gland and a cable as specified for the application
according to
NEC and CEC. The installation must conform to the relevant requirements of
the National Electrical Code® (ANSI/NFPA
-70 (NEC®).
Requirement
●Active field distributor is mounted and grounded.