turck IMXK12-AO Series User guide

Your Global Automation Partner
IMXK12-AO
Analog Signal Isolator
Safety Manual

2 Hans Turck GmbH & Co. KG | T [phone] | F [phone] | [e-mail] | www.turck.com

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1 About this Document 5
2 Scope 5
3 Safety Integrity Level 5
4 Product Description 6
4.1 Safety function 6
4.2 Safe state 6
5 Safety Planning 6
5.1 Architectural specications 6
5.2 Assumptions 7
5.3 FMEDA results 7
5.4 Examples for using the results 7
5.4.1 Probability of dangerous failure per hour (High Demand mode) 7
5.4.2 Average probability of dangerous failure on demand (Low Demand mode) 7
6 Operating Instructions 8
6.1 General 8
6.2 Before operation 9
6.3 Operation 10
6.4 After operation 11
7 Connection and Wiring Diagrams 12
8 Terms and Abbreviations 13
9 Proof Tests 13
10 Document History 14
11 Certicate 14
Contents

4 Hans Turck GmbH & Co. KG | T [phone] | F [phone] | [e-mail] | www.turck.com

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1 About this Document
This safety manual contains all information that is required to operate the device in functional
safety systems. Read this manual carefully before using the device.
This document addresses only functional safety according IEC 61508. Other aspects, such as
intrinsic safety, are not considered.
All instructions must be followed in order to assure functional safety.
Always make sure that this is the latest version of the safety manual at www.turck.com. The
English version is considered the definitive document. Care was taken in the production of the
translations of this document. If there is any uncertainty in its interpretation, refer to the English
version of the safety manual or contact Turck directly.
2 Scope
This safety manual is valid for the following devices.
Ident-No. Product Name Number of
Channels
Terminal Block Design Power-Bridge
connection
Intrinsic-Safety
100000703 IMXK12-AO01-1I-1I-H0/24VDC 1 screw clamps no yes
100000704 IMXK12-AO01-1I-1I-H0/24VDC/CC 1 spring type terminals no yes
3 Safety Integrity Level
The devices are rated to a SIL of
SIL2

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Product Description
Hans Turck GmbH & Co. KG | T [phone] | F [phone] | [e-mail] | www.turck.com
4 Product Description
The analog signal isolators IMXK12-AO are designed to transfer standard galvanic isolated cur-
rent signals from the safe area into the explosion hazardous area in a 1:1 transmission mode.
In addition to the analog signals, digital HART communication signals can be transferred
bidirectional.
Output A1 is assigned to input E1.
Typical applications are the control of I/P converters as well as indicator displays and actuator.
4.1 Safety function
If a current less than 3.6 mA flows into input [E1], a current less than 3.6 mA flows out of the cor-
responding output [A1] within maximum 50ms.
The transmission of the 4…20 mA current is not part of the safety function.
The LED state is not part of the safety function.
4.2 Safe state
In the safe state acurrent less than 3.6 mA flows out of output [A1].
5 Safety Planning
This chapter provides information for planning a safety-related loop.
The device is not specified for a certain application. Make sure that the data provided in this
chapter is valid for your target application.
Special application-specific factors may cause the premature wear of the device and must be
taken into consideration when planning systems; take special measures to compensate for a
lack of experience based values, e.g. through implementation of shorter test intervals.
The suitability for specific applications must be assessed by considering the particular overall
safety-related system with regard to the requirements of IEC 61508.
Safety-planning must only be carried out by trained and qualified personnel. If there is any
doubt contact Turck directly.
5.1 Architectural specications
Due to architectural considerations the following characteristics are specified:
Type A
HFT 0
Experience has shown that the useful lifetime often lies within a range of 8 to 12 years. It can
be significantly less if elements are operated near their specification limits. However, it can
be extended by appropriate measures. For example, heavy temperature fluctuations could
potentially decrease the useful lifetime, as constant temperature below 40 °C could potentially
increase the useful lifetime.

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5.2 Assumptions
■Failure rates are constant for 10 years, wear out mechanisms are not included
■Propagation of failures is not relevant
■External power supply failure ratesare not included
■All components that are not part of the safety function and cannot influence the safety func-
tion (feedback immune) are excluded.
5.3 FMEDA results
The following safety characteristic are the results of the FMEDA.
λSD λSU λDD λDU No eect SFF DC
0 FIT 0 FIT 316 FIT 31 FIT 526 FIT 91 % 91 %
The stated Safe Failure Fraction (SFF) is for reference only. The complete subsystem will need to
be evaluated to determine the overall SFF.
The failure rates used in this analysis are the basic failure rates from the Siemens standard
SN29500 based on the average ambient temperature of components of 40 °C.
“No effect” is a failure mode of a component that plays part in implementing the safety func-
tion but is neither a safe nor a dangerous failure. According to IEC 62061, it would be possible
to classify the“No effect”failures as“Safe Undetected”failures. Not doing so represents the
worst-case.
5.4 Examples for using the results
The following sections provide information about the probability of failures in high demand
and low demand mode according to IEC 61508.
5.4.1 Probability of dangerous failure per hour (High Demand mode)
The PFH values are based on a worst-case diagnostic test rate and a reaction time of 50 ms. The
ratio of the diagnostic test rate to the demand rate shall equal or exceed 100.
PFH
3,0945 E-08 1/h
5.4.2 Average probability of dangerous failure on demand (Low Demand mode)
With the FMEDA results and the values specified in the following table the average frequency of
dangerous failure can be calculated exemplarily:
T1 8760 h
MTTR 24 h
PFDavg
1,44 E-04

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Operating Instructions
Hans Turck GmbH & Co. KG | T [phone] | F [phone] | [email protected] | www.turck.com
6 Operating Instructions
6.1 General
 The device must be registered online: www.turck.com/SIL or with the supplied SIL registra-
tion card. This must be filled in with all required information upon receipt and sent to Turck.
 The device must only be carried out, fitted, installed, operated, commissioned and main-
tained by trained and qualified personnel.
 The device is not specified for acertain application. Make sure that application-specific as-
pects are considered.
 Data from other documents, e.g. data sheets,is not valid for functional safetyoperation.
Devices must be used in cabinets in an typicalindustrial field environment only. The follow-
ingrestrictions describe the operation and storage conditions:
 Ensure that the environment complieswith the following ratings
Minimum ambienttemperature -25 °C
Maximum ambient temperature 70 °C
Minimum storage temperature -40 °C
Maximum storage temperature 80 °C
Maximum air humidity 95 %
Minimum air pressure 80 kPa
Maximum air pressure 110 kPa
 The average temperature over a long period of time directly on the exterior sidewall of the
housing must be maximum 40 °C.
ūThe temperature on the exterior sidewall of the housing can deviate considerably from the
temperature in the control cabinet.
ūThe temperature on the exterior sidewall of the housing must be observed in a steady state.
ūIn case the temperature on the exterior sidewall of the housing is higher, the failure rates
from from „5.3 FMEDA results“ on page 7 must be adjusted:
For a higher average temperature of 60°C on the exterior sidewall of the housing, the failu-
re rates are multiplied by an experience factor of 2.5.
 Ensure that sufficient heat dissipation is provided.
 Protect the device from radiated heat and severe temperature fluctuations.
 Protect the device from dust, dirt, moisture, shock, vibration, chemical stress, increased
radiationand other environmental influences.
 Ensure a degree of protection of at least IP20 according toIEC 60529 at the mounting
location.
 Ensure that the electromagnetic stress does not exceed the requirements of IEC61326-3.1.
 If there is avisible error, e.g. defective housing the device must not be used.
 During operation of the device, surface temperatures may occur that could lead to burns if
touched.
 The device must not be repaired. If problems occur with regard to functional safety, Turck
must be notified immediately and the device must be returned immediately to:
Hans Turck GmbH & Co. KG
Witzlebenstraße 7
45472 Mülheim an der Ruhr
Germany

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6.2 Before operation
 Fasten the device to a rail according EN 60715 (TH35) as follows:
Fig. 1: Fasten the device
 Connect cables according to the wiring diagrams in „7 Connection and Wiring Diagrams“ on
page 12.
 Use cables with Terminal cross section.
ūrigid: 0.2 mm² to 2.5 mm² or
ūflexible 0.2 mm² to 2.5 mm²
 When wiring with stranded wires: Fix the wiring ends with ferrules.
Connection via screw terminals:
 Insert the stripped cable ends (7 mm)in the guides of the cable glands.
 Fasten the screws with a screwdriver (max. tightening torque 0.5 Nm) to fix the cable ends.
0.5 Nm
(4.43 LBS-inc)
0.2…2.5 mm2
(24…13 AWG)
1
2
7 mm
Fig. 2: Connection with screw terminals

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Operating Instructions
Hans Turck GmbH & Co. KG | T [phone] | F [phone] | [email protected] | www.turck.com
Connection with spring-type terminals:
 Push theopening leverwith a suitable screwdriver.
 Insert the stripped cable ends (7 mm) in the guides of the spring-type terminals.
 Pull the screwdriver to fix the cable ends.
2
1
0.2…2.5 mm2
(24…13 AWG)
7 mm
Fig. 3: Connection with spring-type terminals
 Make sure that only suitable equipment, e.g. sensors,are connected to the device (see „7
Connection and Wiring Diagrams“ on page 12).
 Make sure that a suitable power supply with the following characteristic is used:
Minimum voltage 10 VDC
Maximum voltage 30 VDC
Minimum Power 4 W
 The proof test (see „9 Proof Tests“ on page 13)shall be executed in order to check the
requested function.
 The device shall be locked against unintended operation/modification.
6.3 Operation
 If the device is used in low demand mode, proof tests shall be executed according to T1.
 Ensure that theplug connections and cables are always in good condition.
 The device must be replaced immediately if the terminals are faulty or the device has any vis-
ible faults.
 If cleaning is required, do not use any liquid or statically charging cleaning agent. Perform
proof testsafter each cleaning.
 The proof test shall be executed each time after installation and parameterization in order to
check the requested function.
 The LED State is not part of the safety function.
 The device shall be locked against unintended operation/modification.

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6.4 After operation
 Undo the terminal connection on the device.
 Remove the device from its rail fixing as shown in the figure:
Fig. 4: Remove device
 Ensure the proper disposal of the device.

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Connection and Wiring Diagrams
Hans Turck GmbH & Co. KG | T [phone] | F [phone] | [email protected] | www.turck.com
7 Connection and Wiring Diagrams
The pin number assignment can be found at the front label.
Load resistance (A1): ≤ 800 Ω
8 –
7 +
GN
Pwr
RD 6 –
5 +
10…30 VDC
A1
3 +
4 –
E1
4…20 mA
Source 4…20 mA

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8 Terms and Abbreviations
DC Diagnostic Coverage
FIT 1 FIT is 1 failure per 10E09 hours
FMEDA Failure Modes, Effects and Diagnostic Analysis
HFT Hardware failure tolerance
λAU Undetected Annunciation failure rate (per hour)
Annunciation failures do not directly impact safety but impact the ability to detect a future
fault (such as a fault in diagnostic circuit).
λDD Detected dangerous failure rate (per hour)
λDU Undetected dangerous failure rate (per hour)
λSD Detected safe failure rate (per hour)
λSU Undetected safe failure rate (per hour)
MTTR Mean time to restoration (hour)
PFDavg Average probability of failure on demand
PFH Probability of dangerous failure per hour
SFF Safe Failure Fraction
SIL Safety Integrity Level
T1 Proof test interval (hour)
Type A “Non-complex”element (all failure modes are well defined); for details see 7.4.4.1.2 of
IEC61508-2
Type B “Complex”element (using micro controlllers or programmable logic); for details see 7.4.4.1.3
of IEC 61508-2
9 Proof Tests
Proof tests shall be undertaken to reveal dangerous faults which are undetected by diagnostic
tests. This means that it is necessary to specify how dangerous undetected faults which have
been noted during the FMEDA can be detected during proof testing.
Ensure that the proof test is only carried out by qualified personnel.
A suggested proof test consists of the following steps:
Step Action
1. Bypass the safety functions and take appropriate action to avoid a false trip.
2. Provide appropriate input-/control signals to the interface modules and verify the ex-
pected signal input/output conditions for the interfaces.
3. Verify if internal fault detection is working in case it is activated.
4. Provide appropriate input-/control signals to the interface modules and verify that the
safety function is carried out correctly.
5. Remove the bypass and otherwise restore normal operation.
Once the test has been completed, document and archive the results.
This test will detect 95 % of possible dangerous undetected failures.

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Document History
Hans Turck GmbH & Co. KG | T [phone] | F [phone] | [email protected] | www.turck.com
10 Document History
Document Version Date Modications
1.0 2019-09-05 Initial version
11 Certicate
The certificate can be found on the internet at www.turck.com.

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