Endress+Hauser iTEMP TMT85 User manual

Products Solutions Services
Operating Instructions
iTEMP TMT85
Dual-input temperature transmitter with FOUNDATION
FieldbusTM protocol
BA00251R/09/EN/16.20
71498847
2020-06-18
Valid as of version
01.02 (device version)

iTEMP TMT85 Table of contents
Endress+Hauser 3
Table of contents
1 About this document ................ 4
1.1 Document function ..................... 4
1.2 Safety Instructions (XA) .................. 4
1.3 Symbols .............................. 4
1.4 Tool symbols .......................... 6
1.5 Documentation ........................ 6
1.6 Registered trademarks ................... 6
2 Basic safety instructions ............ 7
2.1 Requirements for personnel ............... 7
2.2 Designated use ........................ 7
2.3 Operational safety ...................... 7
2.4 Product safety ......................... 8
2.5 IT security ............................ 8
3 Incoming acceptance and product
identification ....................... 9
3.1 Incoming acceptance .................... 9
3.2 Product identification .................... 9
3.3 Scope of delivery ...................... 10
3.4 Certificates and approvals ............... 10
3.5 Storage and transport .................. 10
4 Installation ....................... 11
4.1 Installation conditions .................. 11
4.2 Installation .......................... 11
4.3 Post-installation check .................. 15
5 Electrical connection .............. 16
5.1 Connection conditions .................. 16
5.2 Connecting the measuring device .......... 16
5.3 Ensuring the degree of protection .......... 22
5.4 Post-connection check .................. 22
6 Operation options ................. 24
6.1 Overview of operation options ............ 24
6.2 Measured value display and operating
elements ............................ 25
7 System integration ................ 27
7.1 FOUNDATION FieldbusTM technology ....... 27
7.2 Configuration of the measuring device and FF
functions ............................ 30
8 Commissioning .................... 31
8.1 Installation check ...................... 31
8.2 Switching on the transmitter ............. 31
8.3 Commissioning the FOUNDATION FieldbusTM
interface ............................ 31
9 Diagnostics and troubleshooting ... 37
9.1 Troubleshooting ...................... 37
9.2 Status messages ...................... 39
9.3 Application errors without messages ....... 44
9.4 Spare parts .......................... 45
9.5 Return .............................. 46
9.6 Disposal ............................ 46
9.7 Software history and overview of
compatibility ......................... 46
10 Maintenance ...................... 46
11 Repair ............................ 46
11.1 General information ................... 46
11.2 Return .............................. 47
11.3 Disposal ............................ 47
12 Accessories ....................... 47
12.1 Device-specific accessories ............... 47
12.2 Communication-specific accessories ........ 48
12.3 Service-specific accessories ............... 48
13 Technical data .................... 50
13.1 Input ............................... 50
13.2 Output ............................. 51
13.3 Power supply ......................... 53
13.4 Performance characteristics .............. 54
13.5 Environment ......................... 60
13.6 Mechanical construction ................ 61
13.7 Certificates and approvals ............... 64
13.8 Supplementary documentation ............ 65
14 Operation via FOUNDATION
FieldbusTM ........................ 66
14.1 Block model .......................... 66
14.2 Resource Block (device block) ............. 66
14.3 Transducer Blocks ..................... 73
14.4 Analog Input function block .............. 89
14.5 PID function block (PID controller) ......... 89
14.6 Input Selector function block ............. 89
14.7 Configuring event behavior according to
FOUNDATION FieldbusTM Field Diagnostics .. 89
14.8 Transmission of event messages over the
bus ................................ 94
Index .................................. 96

About this document iTEMP TMT85
4 Endress+Hauser
1 About this document
1.1 Document function
These Operating Instructions contain all the information that is required in various phases
of the life cycle of the device: from product identification, incoming acceptance and
storage, to mounting, connection, operation and commissioning through to
troubleshooting, maintenance and disposal.
1.2 Safety Instructions (XA)
When using in hazardous areas, compliance with national regulations is mandatory.
Separate Ex-specific documentation is provided for measuring systems that are used in
hazardous areas. This documentation is an integral part of these Operating Instructions.
The installation specifications, connection data and safety instructions it contains must be
strictly observed! Make sure that you use the right Ex-specific documentation for the right
device with approval for use in hazardous areas! The number of the specific Ex
documentation (XA...) is provided on the nameplate. If the two numbers (on the Ex
documentation and the nameplate) are identical, then you may use this Ex-specific
documentation.
1.3 Symbols
1.3.1 Safety symbols
DANGER
This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in
serious or fatal injury.
WARNING
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
serious or fatal injury.
CAUTION
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
minor or medium injury.
NOTICE
This symbol contains information on procedures and other facts which do not result in
personal injury.
1.3.2 Electrical symbols
Symbol Meaning
Direct current
Alternating current
Direct current and alternating current

iTEMP TMT85 About this document
Endress+Hauser 5
Symbol Meaning
Ground connection
A grounded terminal which, as far as the operator is concerned, is grounded via a
grounding system.
Protective Earth (PE)
A terminal which must be connected to ground prior to establishing any other
connections.
The ground terminals are situated inside and outside the device:
• Inner ground terminal: Connects the protectiv earth to the mains supply.
• Outer ground terminal: Connects the device to the plant grounding system.
1.3.3 Symbols for certain types of information
Symbol Meaning
Permitted
Procedures, processes or actions that are permitted.
Preferred
Procedures, processes or actions that are preferred.
Forbidden
Procedures, processes or actions that are forbidden.
Tip
Indicates additional information.
Reference to documentation.
A
Reference to page.
Reference to graphic.
Notice or individual step to be observed.
1.
,
2.
,
3.
… Series of steps.
Result of a step.
Help in the event of a problem.
Visual inspection.
1.3.4 Symbols in graphics
Symbol Meaning Symbol Meaning
1, 2, 3,... Item numbers
1.
,
2.
,
3.
… Series of steps
A, B, C, ... Views A-A, B-B, C-C, ... Sections
-
Hazardous area
.
Safe area (non-hazardous area)

About this document iTEMP TMT85
6 Endress+Hauser
1.4 Tool symbols
Symbol Meaning
A0011220
Flat blade screwdriver
A0011219
Phillips head screwdriver
A0011221
Allen key
A0011222
Open-ended wrench
A0013442
Torx screwdriver
1.5 Documentation
Document Purpose and content of the document
Technical Information
TI00134R/09/en
Planning aid for your device
The document contains all the technical data on the device and provides
an overview of the accessories and other products that can be ordered for
the device.
Brief Operating Instructions
KA00252R/09/en
Guide that takes you quickly to the 1st measured value
The Brief Operating Instructions contain all the essential information
from incoming acceptance to initial commissioning.
The document types listed are available:
In the Download Area of the Endress+Hauser website: www.endress.com → Download
1.6 Registered trademarks
FOUNDATION FieldbusTM
Registered trademark of the Fieldbus Foundation, Austin, Texas, USA

iTEMP TMT85 Basic safety instructions
Endress+Hauser 7
2 Basic safety instructions
2.1 Requirements for personnel
The personnel for installation, commissioning, diagnostics and maintenance must fulfill
the following requirements:
‣Trained, qualified specialists: must have a relevant qualification for this specific
function and task
‣Are authorized by the plant owner/operator
‣Are familiar with federal/national regulations
‣Before beginning work, the specialist staff must have read and understood the
instructions in the Operating Instructions and supplementary documentation as well as
in the certificates (depending on the application)
‣Follow instructions and comply with conditions
The operating personnel must fulfill the following requirements:
‣Operating personnel are instructed and authorized according to the requirements of
the task by the facility's owner-operator
‣Follow the instructions in this manual
2.2 Designated use
The device is a universal and configurable temperature transmitter with either one or two
sensor inputs for resistance thermometers (RTD), thermocouples (TC), resistance and
voltage transmitters. The head transmitter version of the device is intended for mounting
in a terminal head (flat face) as per DIN EN 50446. It is also possible to mount the device
on a DIN rail using the optional DIN rail clip.
If the device is used in a manner not specified by the manufacturer, the protection
provided by the device may be impaired.
The manufacturer is not liable for damage caused by improper or non-designated use.
2.3 Operational safety
‣Operate the device only if it is in proper technical condition, free from errors and faults.
‣The operator is responsible for interference-free operation of the device.
Hazardous area
To eliminate a danger for persons or for the facility when the device is used in the
hazardous area (e.g. explosion protection or safety equipment):
‣Based on the technical data on the nameplate, check whether the ordered device is
permitted for the intended use in the hazardous area. The nameplate can be found on
the side of the transmitter housing.
‣Observe the specifications in the separate supplementary documentation that is an
integral part of these instructions.
Electromagnetic compatibility
The measuring system complies with the general safety requirements of EN 61010-1, the
EMC requirements of the IEC/EN 61326 series and NAMUR recommendation NE 21.
NOTICE
‣The device may only be powered by a power unit with an energy-limited circuit in
accordance with UL/EN/IEC 61010-1, Section 9.4 and the requirements of Table 18.

Basic safety instructions iTEMP TMT85
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2.4 Product safety
This measuring device is designed in accordance with good engineering practice to meet
state-of-the-art safety requirements, has been tested, and left the factory in a condition in
which it is safe to operate.
It meets general safety standards and legal requirements. It also complies with the EC
directives listed in the device-specific EC Declaration of Conformity. Endress+Hauser
confirms this by affixing the CE mark to the device.
2.5 IT security
Our warranty is valid only if the device is installed and used as described in the Operating
Instructions. The device is equipped with security mechanisms to protect it against any
inadvertent changes to the settings.
IT security measures, which provide additional protection for the device and associated
data transfer, must be implemented by the operators themselves in line with their security
standards.

iTEMP TMT85 Incoming acceptance and product identification
Endress+Hauser 9
3 Incoming acceptance and product
identification
3.1 Incoming acceptance
1. Unpack the temperature transmitter carefully. Is the packaging or content free from
damage?
 Damaged components may not be installed as the manufacturer can otherwise
not guarantee compliance with the original safety requirements or the material
resistance, and can therefore not be held responsible for any resulting damage.
2. Is the delivery complete or is anything missing? Check the scope of delivery against
your order.
3. Does the nameplate match the ordering information on the delivery note?
4. Are the technical documentation and all other necessary documents provided? If
applicable: are the Safety Instructions (e.g. XA) for hazardous areas provided?
If one of these conditions is not satisfied, contact your Endress+Hauser Sales Center.
3.2 Product identification
The following options are available for identification of the device:
• Nameplate specifications
• Extended order code with breakdown of the device features on the delivery note
• Enter the serial number from the nameplate in the W@M Device Viewer
(www.endress.com/deviceviewer): All data relating to the device and an overview of the
Technical Documentation supplied with the device are displayed.
• Enter the serial number on the nameplate into the Endress+Hauser Operations App or
scan the 2-D matrix code (QR code) on the nameplate with the Endress+Hauser
Operations App: all the information about the device and the technical documentation
pertaining to the device is displayed.
3.2.1 Nameplate
The right device?
Compare and check the data on the nameplate of the device against the requirements of
the measuring point:
3
11-42V 012345678910
xx.yy.zz
TMT82- XXXXX/XX
iTEMP
Made in Germany 201x
D-87484 Nesselwang
Ser.no.:
FW:
Input:
12345678ABCDEFGH
12345678ABCDEFGH
Dev.Rev: x
Ext. ord. cd.:
XXXXXXXXXXXXX#
12
4
5
6
7
A0014561
 1 Nameplate of the head transmitter (example, Ex version)
1 Power supply, current consumption and radio approval (Bluetooth)
2 Serial number, device revision, firmware version and hardware version
3 Data Matrix 2D code
4 2 lines for the TAG name and extended order code
5 Approval in hazardous area with number of the relevant Ex documentation (XA...)
6 Approvals with symbols
7 Order code and manufacturer ID

Incoming acceptance and product identification iTEMP TMT85
10 Endress+Hauser
3.2.2 Name and address of manufacturer
Name of manufacturer: Endress+Hauser Wetzer GmbH + Co. KG
Address of manufacturer: Obere Wank 1, D-87484 Nesselwang or www.endress.com
Address of manufacturing plant: See nameplate
3.3 Scope of delivery
The scope of delivery of the device comprises:
• Temperature transmitter
• Mounting material, optional
• Hard copy of multi-language Brief Operating Instructions
• Additional documentation for devices which are suitable for use in the hazardous area
(ATEX, FM, CSA)
3.4 Certificates and approvals
The device complies with the requirements of the standards EN 61 010-1 "Safety
Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use" and
with the EMC requirements as per the IEC/EN 61326 series.
3.4.1 CE/EAC mark, Declaration of Conformity
The device meets the legal requirements of the EU/EEU guidelines. The manufacturer
confirms that the device is compliant with the relevant guidelines by applying the CE/EAC
mark.
3.4.2 FOUNDATION FieldbusTM certification
The temperature transmitter successfully passed all tests and is certified and registered by
the Fieldbus Foundation. The device meets all the requirements of the following
specifications:
• Certified in accordance with FOUNDATION FieldbusTM specification
• FOUNDATION FieldbusTM H1
• Interoperability Test Kit (ITK), (device certification number available on request): The
device can also be operated with certified devices of other manufacturers
• Physical Layer Conformance Test of the Fieldbus FOUNDATIONTM
An overview of other approvals and certifications is provided in the "Technical data" section
→  50.
3.5 Storage and transport
Carefully remove all the packaging material and protective covers that are part of the
transported package.
Dimensions and operating conditions: →  61
When storing (and transporting) the device, pack it so that it is reliably protected
against impact. The original packaging offers the best protection.
Storage temperature
–40 to +100 °C (–40 to +212 °F)

iTEMP TMT85 Installation
Endress+Hauser 11
4 Installation
4.1 Installation conditions
4.1.1 Dimensions
The dimensions of the device are provided in the "Technical data" section .→  50
4.1.2 Mounting location
• In the terminal head, flat face, as per DIN EN 50446, direct mounting on insert with
cable entry (middle hole 7 mm)
• In the field housing, separated from the process (see the "Accessories" section →  47)
It is also possible to mount the head transmitter on a DIN rail as per IEC 60715 using
the DIN rail clip accessory (see the "Accessories" section ).
Information about the conditions that must be present at the installation point (such as
the ambient temperature, degree of protection, climate class etc.) so that the device can be
mounted correctly is provided in the "Technical data" section →  47.
When using in hazardous areas, the limit values of the certificates and approvals must be
observed (see Ex Safety Instructions).
4.2 Installation
A Phillips head screwdriver is required to mount the head transmitter:
• Maximum torque for securing screws = 1 Nm (¾ foot-pound), screwdriver: Pozidriv Z2
• Maximum torque for screw terminals = 0.35 Nm (¼ foot-pound), screwdriver: Pozidriv
Z1

Installation iTEMP TMT85
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4.2.1 Mounting the head transmitter
1
2
3
4
5
6
7
9
8
1 2 3 4 5 1234
120 mm
(4.72 in)
120 mm
(4.72 in)
Item A Item B
Item C
A0039675-EN
 2 Head transmitter mounting (three versions)
Item A Mounting in a terminal head (terminal head flat face as per DIN 43729)
1 Terminal head
2 Circlips
3 Insert
4 Connection wires
5 Head transmitter
6 Mounting springs
7 Mounting screws
8 Terminal head cover
9 Cable entry
Procedure for mounting in a terminal head, Item A:
1. Open the terminal head cover (8) on the terminal head.
2. Guide the connection wires (4) of the insert (3) through the center hole in the head
transmitter (5).
3. Fit the mounting springs (6) on the mounting screws (7).
4. Guide the mounting screws (7) through the side boreholes of the head transmitter
and the insert (3). Then fix both mounting screws with the snap rings (2).
5. Then tighten the head transmitter (5) along with the insert (3) in the terminal head.
6. After wiring, close the terminal head cover (8) tightly again.

iTEMP TMT85 Installation
Endress+Hauser 13
Item B Mounting in a field housing
1 Field housing cover
2 Mounting screws with springs
3 Head transmitter
4 Field housing
120 mm
(4.72 in)
140 mm
(5.51 in)
21 mm
(0.83 in)
!6.5 mm
(0.25 in)
A0024604
 3 Dimensions of angle bracket for wall mount (complete wall mounting set available as accessory)
Procedure for mounting in a field housing, Item B:
1. Open the cover (1) of the field housing (4).
2. Guide the mounting screws (2) through the lateral bores in the head transmitter (3).
3. Screw the head transmitter to the field housing.
4. After wiring, close the field housing cover (1) again.
Item C Mounting on DIN rail (DIN rail as per IEC 60715)
1 Mounting screws with springs
2 Head transmitter
3 Circlips
4 DIN rail clip
5 DIN rail
Procedure for mounting on a DIN rail, Item C:
1. Press the DIN rail clip (4) onto the DIN rail (5) until it engages with a click.
2. Fit the mounting springs on the mounting screws (1) and guide the screws through
the side boreholes of the head transmitter (2). Then fix both mounting screws with
the snap rings (3).
3. Screw the head transmitter (2) onto the DIN rail clip (4).

Installation iTEMP TMT85
14 Endress+Hauser
Mounting typical of North America
12 3 4 5
6
5
6
A0008520
 4 Head transmitter mounting
1 Thermowell
2 Insert
3 Adapter, coupling
4 Terminal head
5 Head transmitter
6 Mounting screws
Thermometer design with thermocouples or RTD sensors and head transmitter:
1. Fit the thermowell (1) on the process pipe or the container wall. Secure the
thermowell according to the instructions before the process pressure is applied.
2. Fit the necessary neck tube nipples and adapter (3) on the thermowell.
3. Make sure sealing rings are installed if such rings are needed for harsh
environmental conditions or special regulations.
4. Guide the mounting screws (6) through the lateral bores of the head transmitter (5).
5. Position the head transmitter (5) in the terminal head (4) in such a way that the bus
cable (terminals 1 and 2) point to the cable entry.
6. Using a screwdriver, screw down the head transmitter (5) in the terminal head (4).
7. Guide the connection wires of the insert (3) through the lower cable entry of the
terminal head (4) and through the middle hole in the head transmitter (5). Wire the
connection wires up to the transmitter .
8. Screw the terminal head (4), with the integrated and wired head transmitter, onto
the ready-mounted nipple and adapter (3).
NOTICE
The terminal head cover must be secured properly to meet the requirements for
explosion protection.
‣After wiring, securely screw the terminal head cover back on.

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Mounting the display on the head transmitter
1. 2.
3.
A0009852
 5 Mounting the display
1. Loosen the screw on the terminal head cover. Flip back the terminal head cover.
2. Remove the cover of the display connection area.
3. Fit the display module onto the mounted and wired head transmitter. The fastening
pins must click securely into place on the head transmitter. After mounting, securely
tighten the terminal head cover.
The display can be used only with the appropriate terminal heads - cover with viewing
window (e.g. TA30 from Endress+Hauser).
4.3 Post-installation check
After installing the device, always run the following final checks:
Device condition and specifications Notes
Is the device undamaged (visual inspection)? -
Do the ambient conditions match the device specification (e.g. ambient temperature,
measuring range, etc.)?
See the "Technical
data" section
→  50

Electrical connection iTEMP TMT85
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5 Electrical connection
LCAUTION
‣Switch off the power supply before installing or connecting the device. Failure to
observe this may result in destruction of parts of the electronics.
‣When connecting Ex-certified devices, please take special note of the instructions and
connection schematics in the Ex-specific supplement to these Operating Instructions.
Please contact Endress+Hauser's representative if you have any questions.
‣Do not occupy the display connection. Connecting other devices can destroy the
electronics.
‣Connect the potential matching line to the outer ground terminal before applying the
power supply.
5.1 Connection conditions
A Phillips head screwdriver is required to wire the head transmitter with screw terminals.
The spring terminal version can be wired without any tools.
Proceed as follows to wire a mounted head transmitter:
1. Open the cable gland and the housing cover on the terminal head or the field
housing.
2. Feed the cables through the opening in the cable gland.
3. Connect the cables as shown in →  6,  16. If the head transmitter is fitted with
spring terminals, pay particular attention to the information in the "Connecting to
spring terminals" section". →  17
4. Tighten the cable gland again and close the housing cover.
In order to avoid connection errors always follow the instructions in the post-connection
check section before commissioning!
5.2 Connecting the measuring device
Terminal assignment
-
+
+
1
-
2
7
6
5
4
3
1
2
7
6
5
4
3
Sensor input 2 Sensor input 1 Bus connection
and supply voltage
Display connection/
service interface
TC, mV
RTD, Ω 4-, 3- and 2-wire:
RTD, Ω 3- and 2-wire:
TC, mV
white
red
red
white
white
red
red
(black)
(yellow)
(black)
A0007285-EN
 6 Terminal assignment of head transmitter
NOTICE
‣ ESD - electrostatic discharge. Protect the terminals from electrostatic discharge.
Failure to observe this may result in the destruction or malfunction of parts of the
electronics.

iTEMP TMT85 Electrical connection
Endress+Hauser 17
5.2.1 Connecting the sensor cables
Terminal assignment of the sensor connections →  6,  16.
NOTICE
When connecting 2 sensors ensure that there is no galvanic connection between the
sensors (e.g. caused by sensor elements that are not isolated from the thermowell).
The resulting equalizing currents interfere with the measurements considerably,
resulting in false readings.
‣The sensors must remain galvanically isolated from one another by connecting each
sensor separately to a transmitter. The transmitter provides sufficient galvanic isolation
(> 2 kV AC) between the input and output.
The following connection combinations are possible when both sensor inputs are assigned:
Sensor input 1
Sensor input 2
RTD or
resistance
transmitter,
two-wire
RTD or
resistance
transmitter,
three-wire
RTD or
resistance
transmitter,
four-wire
Thermocouple
(TC), voltage
transmitter
RTD or resistance
transmitter, two-wire   - 
RTD or resistance
transmitter, three-
wire
  - 
RTD or resistance
transmitter, four-wire ----
Thermocouple (TC),
voltage transmitter 
Connecting to spring terminals
2.
3.
4.
5.
1.
2.
3.
AB
C
A0039468
 7 Spring terminal connection, using the example of a head transmitter
Item A, solid wire:
1. Strip wire end. Min. stripping length 10 mm (0.39 in).
2. Insert the wire end into the terminal.
3. Pull the wire gently to ensure it is connected correctly. Repeat from step 1 if
necessary.

Electrical connection iTEMP TMT85
18 Endress+Hauser
Item B, fine-strand wire without ferrule:
1. Strip wire end. Min. stripping length 10 mm (0.39 in).
2. Press down on the lever opener.
3. Insert the wire end into the terminal.
4. Release lever opener.
5. Pull the wire gently to ensure it is connected correctly. Repeat from step 1 if
necessary.
Item C, releasing the connection:
1. Press down on the lever opener.
2. Remove the wire from the terminal.
3. Release lever opener.
5.2.2 FOUNDATION Fieldbus TM cable specification
Cable type
Twin-core cables are recommended for connecting the measuring device to the
FOUNDATION FieldbusTM H1. Following IEC 61158-2 (MBP), four different cable types
(A, B, C, D) can be used with the FOUNDATION FieldbusTM, only two of which (cable types
A and B) are shielded.
• Cable types A or B are particularly preferable for new installations. Only these types have
cable shielding that guarantees adequate protection from electromagnetic interference
and thus the most reliable data transfer. In the case of cable type B, several fieldbuses
(same degree of protection) may be operated in one cable. No other circuits are
permissible in the same cable.
• Practical experience has shown that cable types C and D should not be used due to the
lack of shielding, since the freedom from interference generally does not meet the
requirements described in the standard.
The electrical data of the fieldbus cable have not been specified but determine important
characteristics of the design of the fieldbus, such as distances bridged, number of users,
electromagnetic compatibility, etc.
Type A Type B
Cable structure Twisted pair, shielded One or more twisted pairs, fully shielded
Wire size 0.8 mm2 (18 in2) 0.32 mm2 (22 in2)
Loop-resistance (direct current) 44 Ω/km 112 Ω/km
Characteristic impedance at 31.25 kHz 100 Ω ±20 % 100 Ω ±30 %
Attenuation constant at 39 kHz 3 dB/km 5 dB/km
Capacitive asymmetry 2 nF/km 2 nF/km
Envelope delay distortion (7.9 to 39 kHz) 1.7 mS/km *)
Shield coverage 90 % *)
Max. cable length (incl. spurs > 1 m (3 ft) 1 900 m (6 233 ft) 1 200 m (3 937 ft)
*) Not specified
Suitable fieldbus cables (type A) from various manufacturers for non-hazardous areas are
listed below:
• Siemens: 6XV1 830-5BH10
• Belden: 3076F
• Kerpen: CeL-PE/OSCR/PVC/FRLA FB-02YS(ST)YFL

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Maximum overall cable length
The maximum network expansion depends on the type of protection and the cable
specifications. The overall cable length combines the length of the main cable and the
length of all spurs (>1 m/3.28 ft). Please note the following:
• The maximum permissible overall cable length depends on the cable type used.
• Type A: 1900 m (6200 ft)
• Type B: 1200 m (4000 ft)
• If repeaters are used, the maximum permissible cable length is doubled. A maximum of
three repeaters are permitted between user and master.
Maximum spur length
The line between the distribution box and field device is described as a spur. In the case of
non-Ex applications, the max. length of a spur depends on the number of spurs
(> 1 m (3.28 ft)):
Number of spurs 1 to 12 13 to 14 15 to 18 19 to 24 25 to 32
Max. length per spur 120 m (393 ft) 90 m (295 ft) 60 m (196 ft) 30 m (98 ft) 1 m (3.28 ft)
Number of field devices
In accordance with IEC 61158-2 (MBP), a maximum of 32 field devices can be connected
per fieldbus segment. However, this number is limited under certain conditions (explosion
protection, bus power option, field device current consumption). A maximum of four field
devices can be connected to a spur.
Shielding and grounding
The specifications of the Fieldbus Foundation provided in the "Wiring and Installation"
document must be observed during installation.
Bus termination
The start and end of each fieldbus segment must always be terminated by a bus
terminator. With various junction boxes (non-Ex), the bus termination can be activated via
a switch. If this is not the case, a separate bus terminator must be installed. Please also
note the following:
• In the case of a branched bus segment, the device furthest from the segment coupler
represents the end of the bus.
• If the fieldbus is extended with a repeater, then the extension must also be terminated at
both ends.
Further information
General information and further details about wiring can be found on the website
(www.fieldbus.org) of the Fieldbus Foundation or in the Operating Instructions
"FOUNDATION FieldbusTM Overview", available at: → www.endress.de → Download).
5.2.3 Fieldbus connection
Devices can be connected to the fieldbus in two ways:

Electrical connection iTEMP TMT85
20 Endress+Hauser
• Using a conventional cable gland →  20
• Using the fieldbus connector (optional, available as an accessory) →  20
Risk of damage
• Switch off the power supply before installing or connecting the head transmitter.
Failure to observe this may result in destruction of parts of the electronics.
• Grounding via one of the grounding screws (terminal head, field housing) is
recommended.
• If the shielding of the fieldbus cable is grounded at more than one point in systems
that do not have additional potential equalization, mains frequency equalizing
currents can occur that damage the cable or the shielding. In such cases the
shielding of the fieldbus cable must be grounded on one side only, i.e. it must not be
connected to the ground terminal of the housing (terminal head, field housing). The
shield that is not connected should be insulated!
• We recommend that the fieldbus not be looped using conventional cable glands. If
you replace just one measuring device later on, bus communication will have to be
interrupted.
Cable gland or entry
Please also observe the general procedure on →  16.
2
1
3
4
5
6
A0041953
 8 Connecting the signal cables and power supply
1 Head transmitter installed in field housing
2 Head transmitter installed in terminal head
3 Terminals for fieldbus communication and power supply
4 Internal ground connection
5 External ground connection
6 Shielded fieldbus cable
• The terminals for connecting the fieldbus (1+ and 2-) are not polarity sensitive.
• Conductor cross-section:
• Max. 2.5 mm2 for screw terminals
• Max. 1.5 mm2 for spring terminals. Min. stripping length of cable
10 mm (0.39 in).
• A shielded cable must be used for the connection.
Fieldbus connector
As an option, a fieldbus connector can be screwed into the terminal head or field housing
instead of a cable gland. Fieldbus connectors can be ordered as accessories from Endress
+Hauser (see →  47).
The connection technology of FOUNDATION FieldbusTM allows measuring devices to be
connected to the fieldbus via uniform mechanical connections such as T-boxes, junction
boxes, etc.