IFM Electronic GF711S Manuel utilisateur

Original operating instructions

Fail-safe inductive sensor

GF711S

80236521 / 00 09 / 2016

Contents

1 Preliminary note��3

1�1 Symbols used ��3

1�2 Warning signs used ��3

2 Safety instructions ��4

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

6�1 Protection against simple defeating��8

7 Electrical connection��8

8 Operation��9

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

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)

LED flashes quickly (5 Hz)

1.2 Warning signs used

WARNING

Warning of serious personal injury�

Death or serious irreversible injuries may result�

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�

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�

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�

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 non-

flush installation (→ 6 Installation)�

The fail-safe inductive sensor has been certified by TÜVNord�

5 Function

"0"

"1"

1: dual LED: signal (yellow); power (green)

2: close zone

3: enable zone

4: safe switch-off distance sar

5: target

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�

Enable zone for selected materials*:

Material Enable zone

FE360 (= mild steel) 0�5��4 mm

Stainless steel 0��3�1 mm

AIMg3G22 0��1�8 mm

CuZn37 0��2�0 mm

Copper 0��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�

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)�

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�)

L+

+24 V

IN1

GND

IN2

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 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

EN 61131-2 type 1 or 2:

Logic "1" ≥ 15 V 2��15 mA

≥ 11 V 15��30 mA

Logic "0" ≤ 5 V leakage 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�

8.2 Response times

Response time on safety request

(removal from the enable zone)

≤ 1 ms

Response time when approaching the enable zone

(enable time)

≤ 1 ms

Risk time / response time for safety-related faults ≤ 20 ms

Simultaneity of switching on and off of the outputs in case of a safety

request

≤ 1 ms

Test pulse duration ti_max on A2 (1) ≤ 1 ms

Test pulse interval T on A2 (2)

1: Test pulse duration

2: Test pulse interval T

Ttyp

Tmax

Tmin�

180 ms

300 ms

100 ms

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