Endress+Hauser IO-Link Liquipoint FTW23 User manual

Products Solutions Services
Operating Instructions
Liquipoint FTW23
IO-Link
Capacitance point level measurement
BA01792F/00/EN/01.17
71378479

Liquipoint FTW23 IO-Link
2 Endress+Hauser
Order code:
Ext. ord. cd.:
Ser. no.:
www.endress.com/deviceviewer Endress+Hauser
Operations App
XXXXXXXXXXXX
XXXXX-XXXXXX
XXX.XXXX.XX
Serial number
1.
3.
2.
A0023555

Liquipoint FTW23 IO-Link Table of contents
Endress+Hauser 3
Table of contents
1 Document information .............. 4
1.1 Document function ..................... 4
1.2 Symbols .............................. 4
1.3 Documentation ........................ 5
1.4 Registered trademarks ................... 5
2 Basic safety instructions ............ 6
2.1 Requirements for personnel ............... 6
2.2 Designated use ........................ 6
2.3 Operational safety ...................... 6
2.4 Product safety ......................... 6
3 Product description ................. 7
3.1 Product design ......................... 7
4 Incoming acceptance and product
identification ....................... 8
4.1 Incoming acceptance .................... 8
4.2 Product identification .................... 8
4.3 Storage and transport ................... 9
5 Installation ....................... 10
5.1 Installation conditions .................. 10
5.2 Mounting the measuring device ........... 10
5.3 Post-installation check .................. 11
6 Electrical connection .............. 12
6.1 Connecting the measuring device .......... 12
6.2 Post-connection check .................. 13
7 Operation options ................. 14
7.1 Operation with an operating menu ......... 14
8 System integration ................ 15
8.1 Process data ......................... 15
8.2 Reading out and writing device data (ISDU –
Indexed Service Data Unit) ............... 15
8.3 Overview of diagnostic events ............. 17
9 Commissioning .................... 17
9.1 Function check ....................... 18
9.2 Commissioning with an operating menu ..... 18
9.3 Hysteresis function, level detection ......... 18
9.4 Window function, media detection/
differentiation ........................ 19
9.5 Application example ................... 20
9.6 Light signals (LEDs) .................... 21
9.7 Function of LEDs ...................... 21
9.8 Function testing of switch output .......... 22
10 Diagnostics and troubleshooting ... 23
10.1 Troubleshooting ...................... 23
10.2 Diagnostic information via LED display ...... 23
10.3 Diagnostic events ...................... 24
10.4 Behavior of the device in the event of a fault .. 25
10.5 Resetting to factory settings (reset) ........ 25
11 Maintenance ...................... 26
11.1 Cleaning ............................ 26
12 Repairs ........................... 26
12.1 Return .............................. 26
12.2 Disposal ............................ 26
13 Overview of the onsite display
operating menu ................... 27
14 Description of Device Parameters ... 28
14.1 Identification ......................... 28
14.2 Diagnosis ........................... 29
14.3 Parameter ........................... 31
14.4 Observation ......................... 37
15 Accessories ....................... 37
Index .................................. 38

Document information Liquipoint FTW23 IO-Link
4 Endress+Hauser
1 Document information
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 Symbols
1.2.1 Safety symbols
Symbol Meaning
DANGER
DANGER!
This symbol alerts you to a dangerous situation. Failure to avoid this situation will
result in serious or fatal injury.
WARNING
WARNING!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can
result in serious or fatal injury.
CAUTION
CAUTION!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can
result in minor or medium injury.
NOTICE
NOTE!
This symbol contains information on procedures and other facts which do not result in
personal injury.
1.2.2 Electrical symbols
Symbol Meaning
Ground connection
A grounded terminal which, as far as the operator is concerned, is grounded via a grounding system.
Protective ground connection
A terminal which must be connected to ground prior to establishing any other connections.
1.2.3 Symbols for certain types of information
Symbol Meaning
Preferred
Procedures, processes or actions that are preferred.
Permitted
Procedures, processes or actions that are permitted.
Forbidden
Procedures, processes or actions that are forbidden.
Tip
Indicates additional information.
A
Reference to page
,… ,
1. 2. 3.
Series of steps

Liquipoint FTW23 IO-Link Document information
Endress+Hauser 5
Symbol Meaning
Result of a step
Visual inspection
1.2.4 Symbols for graphics
Symbol Meaning
1, 2, 3 ... Item numbers
A, B, C, ... Views
1.2.5 Symbols for tools
Symbol Meaning
Open-ended wrench
1.3 Documentation
The following document types are also available in the Download Area of the Endress
+Hauser website: www.endress.com → download
Documentation Purpose and content of the document
Technical Information
TI01202F/00/EN
This document contains all the technical data for the device and provides an
overview of the accessories that can be ordered.
Additional documentation
TI00426F/00/EN
SD01622Z/00/YY
BA00361F/00/A6
Weld-in adapter, process adapter and flanges (overview)
Weld-in adapter G 1", G ¾" (installation instructions)
Weld-in adapter M24x1.5 (installation instructions)
1.4 Registered trademarks
is a registered trademark of the IO-Link company group.

Basic safety instructions Liquipoint FTW23 IO-Link
6 Endress+Hauser
2 Basic safety instructions
2.1 Requirements for personnel
Personnel involved in installation, commissioning, diagnostics and maintenance must
meet 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 starting work, read and understand the instructions in the manual and
supplementary documentation as well as the certificates (depending on the application)
• Follow instructions and comply with basic conditions
Operating personnel must meet the following requirements:
• Be instructed and authorized by the plant operator with regard to the requirements of
the task
• Follow the instructions in this manual
2.2 Designated use
The measuring device described in this manual may be used only as a point level switch for
water-, alcohol- or oil-based liquids or for powdered products. Incorrect use may pose a
hazard. To ensure that the measuring device remains in perfect condition during the
operating time:
• Measuring devices must be used only for media to which the process-wetted materials
have an adequate level of resistance.
• The relevant limit values must not be violated, see TI01202F/00/EN.
2.2.1 Incorrect use
The manufacturer is not liable for damage caused by improper or non-designated use.
Residual risks
Due to heat transfer from the process, the temperature of the electronics housing and the
assemblies contained therein may rise to 80 °C (176 °F) during operation.
Danger of burns from contact with surfaces!
‣For elevated fluid temperature, ensure protection against contact to prevent burns.
2.3 Operational safety
Risk of injury!
‣Operate the device in proper technical condition and fail-safe condition only.
‣The operator is responsible for interference-free operation of the device.
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.

Liquipoint FTW23 IO-Link Product description
Endress+Hauser 7
3 Product description
Compact point level switch, preset for water-based liquids; can be adjusted to alcohol- or
oil-based liquids and powdered products; to be used preferably in pipes and in storage,
mixing and process vessels with or without an agitator.
3.1 Product design
1
3
4
5
6
2
A0024689
 1 Product design of Liquipoint FTW23
1 M12 connector
2 Plastic housing cover IP65/67
3 Metal housing cover IP66/68/69
4 Housing
5 Process connection (G ½", G ¾", G 1", M24x1.5)
6 Sensor

Incoming acceptance and product identification Liquipoint FTW23 IO-Link
8 Endress+Hauser
4 Incoming acceptance and product
identification
4.1 Incoming acceptance
A0028673
DELIVERY NOTE
1 = 2
A0016051
Is the order code on the delivery note (1) identical to the order code on the product sticker (2)?
Are the goods undamaged?
A0028673
DELIVERY NOTE
Liquipoint
FTW23-
Ser.No.:
Order code:
Ext. ord. cd.:
FTW23-
TYPE 4X/6P Encl.
IP66/68/69K
CRN: OF1988.5C
TAG:
250003082
BA0xxxxF
MWP:
CUS
03
Date:
CUS
03
XX
CUS N12895
A0024330
Do the data on the nameplates correspond to the order specifications on the delivery note?
If one of these conditions is not satisfied, contact your Sales Center.
4.2 Product identification
The following options are available for identification of the measuring device:
• Nameplate data
• Order code with breakdown of the device features on the delivery note
• Enter serial number from nameplates in W@M Device Viewer
(www.endress.com/deviceviewer): All information on the measuring device is displayed
The serial number on the nameplate can also be used to obtain an overview of the
technical documentation supplied with the device in W@MDevice Viewer
(www.endress.com/deviceviewer)
4.2.1 Manufacturer address
Endress+Hauser GmbH+Co. KG
Hauptstraße 1
79689 Maulburg, Germany
Address of the manufacturing plant: See nameplate.

Liquipoint FTW23 IO-Link Incoming acceptance and product identification
Endress+Hauser 9
4.2.2 Nameplate
Ser. no.:
Order code:
I max.
U:
Ext. ord. cd.:
TAG:
BAxxxxF
40 bar
Date:
06
CUS
1
2
3
4
5
6
78
9
10
12
14 15
16
13
11
N12895
A0035248
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
Device name
Manufacturer's address
Order code
Serial number
Marking for test magnet
Extended order code
Supply voltage
Signal output
Process and ambient temperature
Process pressure
Certificate symbols, communication (optional)
Degree of protection: e. g. IP, NEMA
Measuring point identification (optional)
Date of manufacture (year, month)
Data matrix code with E+H serial number
Document number of Operating Instructions
The test magnet is not included in the scope of delivery and can be ordered as an
optional accessory →  37.
4.3 Storage and transport
4.3.1 Storage conditions
• Permitted storage temperature: –40 to +85 °C (–40 to +185 °F)
• Use original packaging.
4.3.2 Transportation to measuring point
Transport the device to the measuring point in the original packaging.

Installation Liquipoint FTW23 IO-Link
10 Endress+Hauser
5 Installation
5.1 Installation conditions
• Installation is possible in any position in a vessel, pipe or tank.
• For measuring points that are difficult to access, use a socket wrench.
The socket wrench 32 AF can be ordered as an optional extra→  37.
1
2
3
A0016844
 2 Installation examples
1 Overfill protection or upper level detection (MAX)
2 Pump dry running protection (MIN)
3 Lower level detection (MIN)
Installation in horizontal pipes:
G3/4
316L
G3/4
316L
G3/4
316L
G3/4
316L
A0021052
Vertical installation:
If the sensor is not completely covered by the medium or if there are air bubbles on
the sensor, this may interfere with the measurement.
5.2 Mounting the measuring device
5.2.1 Required tools
Open-ended wrench or socket wrench 32 AF
– When screwing in, turn by the hex bolt only.
– Torque: 15 to 30 Nm (11 to 22 lbf ft)

Liquipoint FTW23 IO-Link Installation
Endress+Hauser 11
5.2.2 Installation
A
32 mm 32 mm32 mm
BC
A0024688
A Thread G ½"
B Thread G ¾"
C Thread M24x1.5
Take account of metallic or non-metallic vessels or pipes in accordance with EMC
guidelines, see Technical Information TI01202F.
5.3 Post-installation check
 Is the device undamaged (visual inspection)?
 Is the device adequately protected from wet conditions and direct sunlight?
 Is the device properly secured?

Electrical connection Liquipoint FTW23 IO-Link
12 Endress+Hauser
6 Electrical connection
The measuring device has two modes of operation:
• Maximum point level detection (MAX): e. g. for overfill protection
The device keeps the electrical switch closed as long as the sensor is not yet covered by
liquid or the measured value is within the process window.
• Minimum point level detection (MIN): e. g. to protect pumps from dry running
The device keeps the electrical switch closed as long as the sensor is covered by liquid or
the measured value is outside the process window.
Choosing the MAX or MIN mode of operation ensures that the device switches in a safety-
oriented manner even in an alarm condition, e. g. if the power supply line is disconnected.
The electronic switch opens if the point level is reached, if a fault occurs or if the power
fails (quiescent current principle).
• IO-Link: communication on Q1; switch mode on Q2.
• SIO mode: if there is no communication, the device switches to the SIO mode =
standard IO mode.
The factory-set functions for the MAX and MIN modes can be changed via IO-Link.
6.1 Connecting the measuring device
• Supply voltage 10 to 30 V DC to a DC power supply.
IO-Link communication is guaranteed only if the supply voltage is at least 18 V.
• In accordance with IEC/EN61010 a suitable circuit breaker must be provided for the
measuring device.
• Voltage source: non-hazardous contact voltage or Class 2 circuit (North America).
• The device must be operated with a fine-wire fuse 500 mA (slow-blow).
Electrical connection IO-Link with a switch output
M12 connector
L–
L+
C/Q
2
Q2
1
34SIO
IO-Link
1 Supply voltage +
2 DC-PNP (Q2)
3 Supply voltage -
4 C/Q (IO-Link communication or SIO mode)
Electrical connection Operating mode (SIO mode with factory setting)
M12 connector MAX MIN
0.5A
L– L+
21
34
K
0.5A
L– L+
21
34
K
1
21
2
1
41
4
Symbols
K
Description
Yellow LED (ye) lit
Yellow LED (ye) not lit
external load

Liquipoint FTW23 IO-Link Electrical connection
Endress+Hauser 13
Function monitoring
With two-channel evaluation, functional monitoring of the sensor is also possible in
addition to level monitoring provided that no other monitoring option has been configured
via IO-Link.
When both outputs are connected, the MIN and MAX outputs assume opposite states
(XOR) when the device is operating fault-free. In an alarm condition or in the event of a
line break, both outputs are de-energized, see following table:
Connection for function monitoring using XOR operation Yellow LED
(ye)
Red LED
(rd)
0.5A
L– L+
21
34
K1 K2
Sensor covered
1
2
1
4
Sensor uncovered
4
1
1 2
Fault
21
41
Symbols
K1 / K2
Description
LED lit
LED not lit
Fault or warning
external load
6.2 Post-connection check
Is the device or cable undamaged (visual check)?
Do the cables comply with the requirements ?
Do the cables have adequate strain relief?
Are the cable glands mounted and firmly tightened?
Does the supply voltage match the specifications on the nameplate?
If supply voltage is present, is the green LED lit?
With IO-Link communication: is the green LED flashing?

Operation options Liquipoint FTW23 IO-Link
14 Endress+Hauser
7 Operation options
7.1 Operation with an operating menu
7.1.1 IO-Link
IO-Link information
IO-Link is a point-to-point connection for communication between the measuring device
and an IO-Link master. The measuring device features an IO-Link communication interface
type 2 with a second IO function on pin 4. This requires an IO-Link-compatible assembly
(IO-Link master) for operation. The IO-Link communication interface enables direct access
to the process and diagnostic data. It also provides the option of configuring the measuring
device while in operation.
Physical layer, the measuring devices supports the following features:
• IO-Link specification: version 1.1
• IO-Link Smart Sensor Profile 2nd Edition
• SIO mode: yes
• Speed: COM2; 38.4 kBaud
• Minimum cycle time: 6 msec.
• Process data width: 16 bit
• IO-Link data storage: yes
• Block configuration: no
IO-Link download
http://www.endress.com/download
• Select "Software" as the media type.
• Select "Device Driver" as the software type.
Select IO-Link (IODD).
• In the "Text Search" field enter the device name.
https://ioddfinder.io-link.com/
Search by
– Manufacturer
– Article number
– Product type
7.1.2 Structure of the operating menu
The menu structure has been implemented according to VDMA 24574-1 and
complemented by Endress+Hauser-specific menu items.
For an overview of the operating menu, see →  27

Liquipoint FTW23 IO-Link System integration
Endress+Hauser 15
8 System integration
8.1 Process data
The measuring device has two switch outputs. Both outputs are transmitted as process
data via IO-Link.
• In the SIO mode, switch output 1 is switched at pin 4 of the M12 plug. In the IO-Link
communication mode, this pin is reserved exclusively for communication.
• In addition, switch output 2 is always switched at pin 2 of the M12 plug.
• The process data of the point level switch are transmitted cyclically in 16-bit chunks.
Bit 0 (LSB) 1 ... 12 13 (MSB) 14 15
Measuring device Coverage [0 to 16 384], resolution approx. 0.05% OU1 OU2
Bit 14 reflects the status of switch output 1 and bit 15 the status of switch output 2. Here,
the logical state "1" at the specific switch output corresponds to "closed" or 24 VDC.
The remaining 14 bits contain the coverage value [0 to 16 384] following conversion using
the calculation factor. The raw value (R) must be converted to the coverage value (C) =
Coverage) by the target system.
C = 200 *R
16 384
Bit Process value Value range
14 OU1 0 = open
1 = closed
15 OU2 0 = open
1 = closed
0 to 13 Raw measured value, not coverage [0 to 100] u_Integer
In addition, the coverage value can be read via ISDU (hex) 0x0028 – acyclic service.
8.2 Reading out and writing device data (ISDU – Indexed
Service Data Unit)
Device data are always exchanged acyclically and at the request of the IO-Link master.
Using the device data, the following parameter values or device statuses can be read out:
8.2.1 Endress+Hauser-specific device data
Designation ISDU
(dec)
ISDU
(hex)
Size
(byte)
Data type Access Default
value
Value range Offset /
Gradient
Data
storage
Range limits
Extended Ordercode 259 0x0103 60 String ro
ENP_VERSION 257 0x0101 16 String ro 02.03.00
Active switchpoints 64 0x0040 1 UInt8 r/w Standard 0 ~ Standard
1 ~ User

System integration Liquipoint FTW23 IO-Link
16 Endress+Hauser
Designation ISDU
(dec)
ISDU
(hex)
Size
(byte)
Data type Access Default
value
Value range Offset /
Gradient
Data
storage
Range limits
Reset user
switchpoints
65 0x0041 1 UIntegerT r/w False 0 ~ False
1 ~ Switchpoints
OU1
2 ~ Switchpoints
OU2
Simulation switch
output (OU1)
89 0x0059 1 UInt8 r/w Off 0 ~ Off
1 ~ High
2 ~ Low
0 / 0 No 0...2
Simulation switch
output (OU2)
68 0x0044 1 UInt8 r/w Off 0 ~ Off
1 ~ High
2 ~ Low
0 / 0
No
0...2
Device search 69 0x0045 1 UInt8 r/w Off 0 ~ Off
1 ~ On
0 / 0 No 0...1
Sensor check 70 0x0046 1 UInt8 w ‒ 0 / 0 No
Calibrate coverage,
Output 1 (OU1)
87 0x0057 1 UInt8 w 1
Switch point value
(Coverage), Output 1
(SP1/FH1)
71 0x0047 2 UInt16 r/w 77.5 % 0 / 0.1 Yes 0...200
Switchback point
value
(Coverage), Output 1
(rP1/FL1)
72 0x0048 2 UInt16 r/w 73.0 % 0 / 0.1 Yes 0...200
Switching delay time,
Output 1 (dS1)
81 0x0051 2 UInt16 r/w 0.5 s 0 / 0.1 Yes 0.3 to 600
Switchback delay
time, Output 1 (dR1)
82 0x0052 2 UInt16 r/w 1.0 s 0 / 0.1 Yes 0.3 to 600
Output 1 (OU1) 85 0x0055 1 UInt8 r/w HNO 0 ~ HNO 1)
1 ~ HNC 1)
2 ~ FNO 1)
3 ~ FNC 1)
Yes 0 to 3
Calibrate coverage,
Output 2 (OU2)
88 0x0058 1 UInt8 w 1
Switch point value
(Coverage), Output 2
(SP2/FH2)
75 0x004B 2 UInt16 r/w 77.5 % 0 / 0.1 Yes 0...200
Switchback point
value
(Coverage), Output 2
(rP2/FL2)
76 0x004C 2 UInt16 r/w 73.0 % 0 / 0.1 Yes 0...200
Switching delay time,
Output 2 (dS2)
83 0x0053 2 UInt16 r/w 0.5 s 0 / 0.1 Yes 0.3 to 600
Switchback delay
time, Output 2 (dR2)
84 0x0054 2 UInt16 r/w 1.0 s 0 / 0.1 Yes 0.3 to 600
Output 2 (OU2) 86 0x0056 UInt8 r/w HNC 0 ~ HNO 1)
1 ~ HNC 1)
2 ~ FNO 1)
3 ~ FNC 1)
0 to 3
Operating hours 96 0x0060 4 UInt32 r 0 0 / 0.016667 No 0 to 2^32
µC-Temperature 91 0x005B 1 Int8 r °C: 0 / 1
°F: 32 / 1.8
K: 273.15 / 1
No -128...127
Unit changeover
(UNI) - µC-
Temperature
80 0x0050 1 UInt8 r/w °C 0 ~ °C
1 ~ °F
2 ~ K
0 / 0 Yes 0...2

Liquipoint FTW23 IO-Link Commissioning
Endress+Hauser 17
Designation ISDU
(dec)
ISDU
(hex)
Size
(byte)
Data type Access Default
value
Value range Offset /
Gradient
Data
storage
Range limits
Minimum µC-
Temperature
92 0x005C 1 Int16 r/w 127 °C: 0 / 1
°F: 32 / 1.8
K: 273.15 / 1
No -128...127
Maximum µC-
Temperature
93 0x005D 1 Int16 r/w -128 °C: 0 / 1
°F: 32 / 1.8
K: 273.15 / 1
No -128...127
1) For an explanation of the abbreviations, see the parameter description →  34
8.2.2 IO-Link-specific device data
Designation ISDU (dec) ISDU (hex) Size (byte) Data type Access Default value Data storage
Serial number 21 0x0015 max. 16 String ro
Firmware version 23 0x0017 max. 64 String ro
ProductID 19 0x0013 max. 64 String ro FTW23
ProductName 18 0x0012 max. 64 String ro Liquipoint
ProductText 20 0x0014 max. 64 String ro Capacitance point level switch
VendorName 16 0x0010 max. 64 String ro Endress+Hauser
VendorText 17 0x0011 max. 64 String ro People for Process Automation
Hardware Revision 22 0x0016 max. 64 String ro
Application Specific Tag 24 0x0018 32 String r/w
Device Type 256 0x0100 2 Uinteger16 ro 0x91FF
Actual Diagnostics (STA) 260 0x0104 4 String ro No
Last Diagnostic (LST) 261 0x0105 4 String ro No
8.2.3 System commands
Designation ISDU (dec) ISDU (hex) Value range Access
Reset to factory settings (RES) 2 0x0002 130 w
Device Access Locks.Data Storage Lock 12 0x000C 0 ~ False
2 ~ True
rw
8.3 Overview of diagnostic events
→  25
9 Commissioning
If an existing configuration is changed, measuring operation continues! The new or
modified entries are only accepted once the setting has been made.
LWARNING
Risk of injury and damage to property due to uncontrolled activation of processes!
‣Make sure that downstream processes are not started unintentionally.

Commissioning Liquipoint FTW23 IO-Link
18 Endress+Hauser
9.1 Function check
Before commissioning your measuring point, ensure that the post-installation and post-
connection checks have been performed:
• "Post-installation check" checklist→  11
• "Post-connection check" checklist→  13
9.2 Commissioning with an operating menu
IO-Link communication
• Commissioning with factory settings: The device is configured for use with aqueous
media. The device can be commissioned directly when used with aqueous media.
Factory setting: output 1 and output 2 are configured for XOR operation. The Standard
option is selected in the Active switchpoints parameter.
• Commissioning with customer-specific settings, e.g. non-conductive media (oils,
alcohols) or powdered products: the device can be configured differently from the
factory setting via IO-Link. Select User in the Active switchpoints parameter.
• Each change must be confirmed with Enter to ensure that the value is accepted.
• Incorrect switching is suppressed by adjusting the settings in the switch/switchback
delay (Switch point value/Switchback point value parameters).
9.3 Hysteresis function, level detection
9.3.1 Wet calibration
1. Navigate to the Application menu level
 Setting: Active switchpoints = User
2. Immerse the device in the medium to be detected.
3. Accept the measured value shown for the switch output in question.
 Setting: Calibrate coverage, Output 1/2 (OU1/2)
The automatically generated switch limits can be adjusted accordingly.
9.3.2 Dry calibration
This calibration is suitable if the medium values are known.
1. Navigate to the Application menu level
 Setting: Active switchpoints = User
2. Configure the behavior of the switch output.
 Setting: Output 1/2 (OU1/2) = Hysteresis normally open (MIN) (HNO) or
Hysteresis normally closed (MAX) (HNC)
3. Enter the measured values for the switch point and switchback point. The set value
for the switch point "SP1"/"SP2" must be greater than the switchback point "rP1" /"rP2"
→  32.
 Setting: Switch point value (Coverage), Output 1/2 (SP1/2 or FH1/2) and
Switchback point value (Coverage), Output 1/2 (rP1/2 or FL1/2)

Liquipoint FTW23 IO-Link Commissioning
Endress+Hauser 19
rP1
SP1
OU1
rP2
SP2
A
OU2
%
HNO (MIN)
HNC (MAX)
t
1
0
1
0
{
A0034529
 3 Calibration (default)
0 0-signal, output open
1 1-signal, output closed
A Hysteresis (difference between the value of the switch point "SP1" and the value of the switchback point "rP1")
% Coverage of sensor
HNO Normally open contact (MIN)
HNC Normally closed contact (MAX)
SP1 Switch point 1 / SP2: Switch point 2
rP1 Switchback point 1 / rP2: Switchback point 2
Recommended assignment of switch outputs:
• MAX mode for overfill protection (HNC)
• MIN mode for dry running protection (HNO)
9.4 Window function, media detection/differentiation
Unlike the hysteresis, media are detected only if they are within the defined window.
Depending on the medium, a switch output can be used here.
9.4.1 Wet calibration
1. Navigate to the Application menu level
 Setting: Active switchpoints = User
2. Configure the behavior of the switch output.
 Setting: Output 1/2 (OU1/2) = Window normally open (FNO) or Window
normally closed (FNC)
3. Immerse the device in the medium to be detected.
 Setting: Calibrate coverage, Output 1/2 (OU1/2)
Setting: Switch point value (Coverage), Output 1/2 (FH1/2) and Switchback
point value (Coverage), Output 1/2 (FL1/2)
The automatically generated switch limits can be adjusted accordingly.
9.4.2 Dry calibration
This calibration is suitable if the measured values of the medium are known.
For reliable detection of the medium, the process window must be sufficiently large.
1. Navigate to the Application menu level
 Setting: Active switchpoints = User

Commissioning Liquipoint FTW23 IO-Link
20 Endress+Hauser
2. Configure the behavior of the switch output.
 Setting: Output 1/2 (OU1/2) = Window normally open (FNO) or Window
normally closed (FNC)
3. Define the window around the calibrated value for the switch point/switchback point
of the output (percentage coverage). The set value for the switch point "FH1"/"FH2"
must be greater than the switchback point "FL1" /"FL2".
 Setting: Switch point value (Coverage), Output 1/2 (SP1/2 or FH1/2) and
Switchback point value (Coverage), Output 1 (rP1/2 or FL1/2)
9.5 Application example
Differentiating between milk and cleaning agent (CIP cleaning) using the example of wet
calibration in the process.
1. Navigate to the Application menu level
 Setting: Active switchpoints = User
2. Assign switch function to the switch outputs:
 Switch output active if medium detected → Setting: Output 1 (OU1) = Window
normally open (FNO)
Switch output active if medium detected → Setting: Output 2 (OU2) = Window
normally closed (FNC)
3. Medium 1: Sensor is covered by milk.
 Setting: Calibrate coverage, Output 1 (OU1)
4. Medium 2: Sensor is covered by CIP cleaning agent.
 Setting: Calibrate coverage, Output 2 (OU2)
FL1
FH1
OU1
FL2
FH2
B
OU2
t
A
%
FNO
FNC
1
0
1
0
A0034568
 4 Medium detection/Process window
0 0-signal, output open
1 1-signal, output closed
% Coverage of sensor
A Medium 1, process window 1
B Medium 2, process window 2
FNO Closing
FNC NC contact
FH1 / FH2 Upper value process window
FL1 / FL2 Lower value process window