1�1 Symbols used ������������������������������������������������������������������������������������������������3
1�2 Warning signs used ���������������������������������������������������������������������������������������3
2�1 Safety-related requirements regarding the application ���������������������������������� 4
3 Items supplied������������������������������������������������������������������������������������������������������5
4 Functions and features ����������������������������������������������������������������������������������������6
5 Function ��������������������������������������������������������������������������������������������������������������� 6
5�1 Enable zone ��������������������������������������������������������������������������������������������������� 6
6 Installation������������������������������������������������������������������������������������������������������������7
8�1 Switching state of the outputs ������������������������������������������������������������������������9
8�1�1 The safe state ��������������������������������������������������������������������������������������� 9
8�1�2 The switched state �������������������������������������������������������������������������������� 9
8�1�3 Output characteristics ��������������������������������������������������������������������������� 9
8�1�4 Cross fault / short circuit �����������������������������������������������������������������������9
8�2 Response times ������������������������������������������������������������������������������������������� 10
8�3 LED display ������������������������������������������������������������������������������������������������� 11
9 Technical data ���������������������������������������������������������������������������������������������������� 12
10 Troubleshooting �����������������������������������������������������������������������������������������������14
11 Maintenance, repair and disposal ��������������������������������������������������������������������14
12 Terms and abbreviations ����������������������������������������������������������������������������������15
2
Page 3
1 Preliminary note
The instructions are part of the unit� They are intended for authorised persons
according to the EMC, Low Voltage and Machinery Directives and safety
regulations�
The instructions contain information about the correct handling of the product�
Read the instructions before use to familiarise yourself with operating conditions,
installation and operation�
Follow the safety instructions�
1.1 Symbols used
►Instructions
→Cross-reference
Important note
Non-compliance can result in malfunction or interference�
Information
Supplementary note�
LED on
LED off
LED flashes (2 Hz)
UK
LED flashes quickly (5 Hz)
1.2 Warning signs used
WARNING
Warning of serious personal injury�
Death or serious irreversible injuries may result�
3
Page 4
2 Safety instructions
• Follow the operating instructions�
• Improper use may result in malfunctions of the unit� This can lead to personal
injury and/or damage to property during operation of the machine� For this
reason note all remarks on installation and handling given in this document�
Also adhere to the safety instructions for the operation of the whole installation�
• In case of non-observance of notes or standards, especially when tampering
with and/or modifying the unit, any liability and warranty is excluded�
• If the sensor is damaged, the safety function cannot be guaranteed�
• Errors caused by damage cannot be detected by the sensor�
• The unit must be installed, connected and put into operation by a qualified
electrician trained in safety technology�
• The applicable technical standards for the corresponding application must be
complied with�
• For installation the requirements according to EN 60204 must be observed�
• In case of malfunction of the unit please contact the manufacturer� Tampering
with the unit is not allowed�
• Disconnect the unit externally before handling it� Also disconnect any
independently supplied relay load circuits�
• After installation, maintenance or repair of the system perform a complete
function check�
• Use the unit only in specified environmental conditions (→ 9 Technical data)� In
case of special operating conditions please contact the manufacturer�
• Use only as described below (→ 4)�
2.1 Safety-related requirements regarding the application
It must be ensured that the safety requirements of the respective application
correspond to the requirements stated in these instructions�
4
Page 5
WARNING
Failure of the safety function
When used outside of the defined environmental conditions, the safety-related
function of the sensor cannot be guaranteed�
► Use only in accordance with the defined environmental conditions (→ 9
Technical data)�
Use of the sensor in the vicinity of chemical and biological media (solid, liquid,
gaseous) as well as ionising radiation is not permitted�
UK
Observe the following requirements:
► Take measures to avoid metallic objects being placed on the sensing face
unintentionally�
► Adhere to EN 14119 for interlocking devices associated with guards�► Adhere to the principle of normally closed operation for all external safety
circuits connected to the system�
► In case of faults within the fail-safe sensor which result in the defined safe
state: take measures to maintain the safe state when the complete control
system continues to be operated�
► Replace damaged units�
3 Items supplied
1 fail-safe sensor GF711S with 2 M12 fixing nuts,
1 original instructions GF711S, ident no� 80236521�
If one of the above-mentioned components is missing or damaged, please contact
one of the ifm branch offices�
5
Page 6
4 Functions and features
The fail-safe inductive sensor GF711S detects metal without contact�
Safety function SF: the safe state (output stage switched off; logic "0") is achieved
when undamping greater than or equal to the safe switch-off distance sar (→ 9
Technical data)�
Also observe the notes on installation of the sensor (→ 6 Installation)�
The fail-safe inductive sensor is a proximity device with defined behaviour under
fault conditions (PDDB) to IEC 60947-5-3�
The fail-safe sensor conforms to Performance Level d according to
EN ISO 13849-1 as well as to the requirements SIL 2 to IEC 61508 and meets
SILcl 2 to IEC 62061�
The unit corresponds to the classification I2A12SP2 to IEC 60947-5-2 for nonflush installation (→ 6 Installation)�
The fail-safe inductive sensor has been certified by TÜVNord�
5 Function
"1"
1: dual LED: signal (yellow); power (green)
2: close zone
3: enable zone
"0"
4: safe switch-off distance s
5: target
ar
5.1 Enable zone
The outputs (OSSD) are only enabled when a damping target is present in the
enable zone� Outside this enable zone the outputs remain switched off�
The safe switch-off distance sar is > 6 mm�
The enable zone is different if damping elements which deviate from the
standard target plate in terms of material, form and size are used�
6
Page 7
Enable zone for selected materials*:
MaterialEnable zone
FE360 (= mild steel)0�5���4 mm
Stainless steel0���3�1 mm
AIMg3G220���1�8 mm
CuZn370���2�0 mm
Copper0���1�2 mm
* Typical values for damping with a reference target of 12 x 12 x 1 mm and non-flush
installation to IEC 60947-5-2 at an ambient temperature of 20 °C�
UK
Depending on the characteristics of the damping element there may be no
close zone�
6 Installation
The unit is non-flush mountable according to IEC 60947-5-2, type I2A12SP2�
► Ensure the unit cannot work loose (tightening torque ≤ 7 Nm).► Adhere to the installation conditions in accordance with the figures 1 to 3:
► Tighten the socket according to the manufacturer's indications� Observe the
tightening torque for the ifm socket (e�g� EVxxxx: 0�6���1�5 Nm)�
Flush installation of the fail-safe sensor is not permitted since this can result
in an increase of the sensing range up to enabling of the outputs (OSSDs)�
7
Page 8
6.1 Protection against simple defeating
The fail-safe sensor reacts to metal objects, e�g� the frame of a safety door� Other
metal objects that are not intended to enable the sensor must not be allowed to
enable the fail-safe sensor unintentionally�
► Take measures to prevent metal objects, except the designated
target, from being placed on the sensing face or in the enable zone
unintentionally�
7 Electrical connection
► Disconnect power� Also disconnect any independently supplied relay load
circuits�
► Supply voltage: connect L+ to pin 1 and L- to pin 3 of the connector�
The nominal voltage is 24 V DC� This voltage may vary between 19�2 V and
30 V incl� 5 % residual ripple to EN 61131-2�
In case of a single fault the supply voltage must not exceed a maximum
of 40 V DC� (This requires the safe separation between power supply and
transformer�)
+
1
L
+24 V
2
A1
IN1
3
L
GND
A2
4
IN2
1
1: safety-related logic unit *
* When there is no current flow on the output stage, back feeding > 3�5 V will lead
to malfunction�
8
Page 9
8 Operation
8.1 Switching state of the outputs
8.1.1 The safe state
The safe state is when at least one of the outputs A1 or A2 (OSSDs) is switched
off (zero-current state: logic "0")�
If one of the outputs A1 or A2 is switched off, the subsequent safety-related logic
unit must bring the complete system into the state defined as safe�
8.1.2 The switched state
If the damping element is in the enable zone and if there is no sensor error, both
outputs A1 and A2 (OSSDs) are enabled (logic "1")�
8.1.3 Output characteristics
The output characteristics are compatible with the input characteristics to
UK
EN 61131-2 type 1 or 2:
Logic "1"≥ 15 V2���15 mA
≥ 11 V15���30 mA
Logic "0"≤ 5 Vleakage current 0�2 mA
The interface corresponds to interface type C class 1 according to the ZVEI
position paper "Klassifizierung binärer 24-V-Schnittstellen mit Testung im Bereich
der Funktionalen Sicherheit" (Classification of binary 24V interfaces tested with
regard to functional safety)�
8.1.4 Cross fault / short circuit
• A cross fault between both outputs (A1 and A2) is detected by the fail-safe
sensor and results in the outputs (OSSD) being switched off at the next safety
request� The outputs A1 and A2 remain switched off until the error has been
removed or a voltage reset has been carried out�
• A cross fault (short circuit) between output A2 and the supply voltage results in
the other output A1 being switched off in case of a safety request�
• When there is no current flow on the output stage, back feeding > 3�5 V will
lead to malfunction�
• The device carries out self-tests for the switch-off capability on A2�
9
Page 10
8.2 Response times
Response time on safety request
≤ 1 ms
(removal from the enable zone)
Response time when approaching the enable zone
≤ 1 ms
(enable time)
Risk time / response time for safety-related faults≤ 20 ms
Simultaneity of switching on and off of the outputs in case of a safety
≤ 1 ms
request
Test pulse duration t
Test pulse interval T on A2 (2)
on A2 (1)≤ 1 ms
i_max
T
typ
T
max
T
�
min
180 ms
300 ms
100 ms
1
0
t
1: Test pulse duration
2: Test pulse interval T
10
Page 11
8.3 LED display
LEDOperating statusOutputsA1
(OSSD)
Signal
Power
Signal
Power
Signal
Power
Signal
Power
No voltage supplyBoth outputs switched off00
Undervoltage1
0
OvervoltageBoth outputs switched off00
Sensor fault
(→ 10 Troubleshooting)
Damping element in the
enable zone
Damping element in the
One output or both
outputs switched off
Both outputs enabled11
Output A2 is switched off10
0
1
0
A2
(OSSD)
0
0
UK
1
0
0
close zone
11
Page 12
9 Technical data
GF711
S
GIFA4004-2PS/SIL2/V4A/U
S
Inductive sensors
Product characteristics
Fail-safe inductive sensor
Metal thread M12 x 1
M12 connector
Enable zone 0.5...4 mm; [nf] non-flush mountable
Complies with the requirements:
EN ISO 13849-1: 2015 category 2 PL d (can be used in applications up to cat. 3)
IEC 61508: SIL 2
IEC 62061: SILcl 2
Application
Type of operationcontinuous operation (maintenance-free)
Electrical data
Electrical designDC PNP
Operating voltage24 DC (19.2...30 DC)
Rated insulation voltage30
Current consumption< 20
Protection classIII
Reverse polarity protectionyes
Outputs
Output function2 x OSSD (A1 and A2)
Output dataInterface type C class 1
Output voltage at 24 Vcompatible with EN 61131-2 inputs type 1, 2
Voltage drop< 2.5; (30 mA)
Current rating100
Short-circuit protectionyes
Max. capacitive load CL_max20
Range
Enable zone0.5...4
Safe switching off distance s(ar)6
Reaction times
Power-on delay time1
Response time to safety request≤ 1
Response time when approaching
the enable zone (enable time)≤ 1
Risk time (response time for safety
-related faults)≤ 20
[V]
[V]
[mA]
[V]
[mA]
[nF]
[mm]
[mm]
[s]
[ms]
[ms]
[ms]
12
Page 13
Environment
ApplicationsClass C to EN 60654-1 weatherproof application
Ambient temperature-25...70, for service life ≤ 87600 h
Rate of temperature change0.5
Max. relative air humidity5...95, briefly
Air pressure80...106
Height above sea level≤ 2000
Ionising radiationnot permissible
Salt sprayno
ProtectionIP 65 / IP 67
Tests / approvals
EMC
[°C]
10...40, for service life ≤ 175200 h
[K/min]
[%]
5...70, permanently
[kPa]
[m]
IEC 60947-5-2
IEC 60947-5-3
EN 60947-5-2
EN 61000-4-2 ESD: 6 kV CD / 8 kV AD
EN 61000-4-3 HF radiated: 20 V/m
EN 61000-4-4 Burst: 2 kV
EN 61000-4-6 HF conducted: 10 V
EN 61000-4-8: 30 A/m
EN 55011: class B
Unless stated otherwise, all data refer to the 12x12x1 mm reference target plate to IEC
60947-5-2 (FE360 = mild steel) over the whole temperature range.
13
Page 14
10 Troubleshooting
LED display → 8.3
ProblemPossible causeTroubleshooting
No LED displayNo voltage supplyApply voltage
Power LED flashes and
sensor does not switch
Sensor does not switch,
not even after undamping
and redamping
No close zoneDue to its characteristics
• Undervoltage
• Overvoltage
Sensor was brought into the
safe state (logic "0")� Cause:
• cross fault between both
outputs A1 and A2
• cross fault between output
A2 and the supply voltage
• error in the sensor detected
(material, form, size), the
damping element displaces
the enable zone until directly
in front of the sensing face
Correct the voltage
(→ 9 Technical data)
• Remove the cross fault
• Replace the unit
If possible, change the
material, form or size of the
damping element (→ 5.1
Enable zone)
11 Maintenance, repair and disposal
If used correctly, no maintenance and repair measures are necessary�
Only the manufacturer is allowed to repair the unit�
After use dispose of the unit in an environmentally friendly way in accordance with
the applicable national regulations�
14
Page 15
12 Terms and abbreviations
OSSDOutput Signal Switch Device
PDDBProximity devices with defined
behaviour under fault conditions
PFH
(PFHD)
Probability of (dangerous) Failure
per Hour
PLPerformance LevelPL to EN ISO 13849-1
SILSafety Integrity LevelSIL 1-4 to IEC 61508� The higher the
SIL, the lower the probability that a safety
function will fail�
SIL
T
M
cl
Safety Integrity Level
claim limit
According to IEC 62061
Mission timeLifetime to EN 60947-5-3
(= max� service life)
UK
15
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