IEC 61496-1:2004/AMD1:2007

IEC 61496-1
Edition 2.0 2007-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Safety of machinery – Electro-sensitive protective equipment –
Part 1: General requirements and tests

Sécurité des machines – Equipements de protection électro-sensibles –
Partie 1: Prescriptions générales et essais

IEC 61496-1 A1:2007
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IEC 61496-1
Edition 2.0 2007-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Safety of machinery – Electro-sensitive protective equipment –
Part 1: General requirements and tests

Sécurité des machines – Equipements de protection électro-sensibles –
Partie 1: Prescriptions générales et essais

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
H
CODE PRIX
ICS 13.110; 29.260.99 ISBN 2-8318-9316-X

– 2 – 61496-1 Amend. 1 © IEC:2007
FOREWORD
This amendment has been prepared by IEC technical committee 44: Safety of machinery –
Electrotechnical aspects.
The text of this amendment is based on the following documents:
FDIS Report on voting
44/560/FDIS 44/568/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
The contents of the corrigendum of July 2008 have been included in this copy.

___________
Page 11
1 Scope
Add, after the third paragraph, the following new paragraph:
While a data interface can be used to control optional safety-related ESPE functions
(Annex A), this standard does not provide specific requirements. Requirements for these
safety-related functions can be determined by consulting other standards (for example, IEC
61508, IEC/TS 62046, IEC 62061, and ISO13849-1).
2 Normative references
Add, to the existing list, the title of the following standard:
IEC 62061, Safety of machinery – Functional safety of safety-related electrical, electronic and
programmable electronic control systems
Page 15
3 Terms and definitions
Replace definition 3.5 by the following new definition:

61496-1 Amend. 1 © IEC:2007 – 3 –
3.5
electro-sensitive protective equipment
ESPE
assembly of devices and/or components working together for protective tripping or presence-
sensing purposes and comprising as a minimum
– a sensing device;
– controlling/monitoring devices;
– output signal switching devices and/or a safety-related data interface
NOTE 1 The safety-related control system associated with the ESPE, or the ESPE itself, may further include a
secondary switching device, muting functions, stopping performance monitor, etc. (see Annex A).
NOTE 2 A safety-related communication interface can be integrated in the same enclosure as the ESPE.
3.16
muting
temporary automatic suspension of a safety function(s) by safety-related parts of the control
system
NOTE For ESPE-muting, see Clause A.7.
Replace, on page 19, definitions 3.17 and 3.18 by the following new definitions:
3.17
OFF-state
state of the output(s) of the ESPE in which the machine under control is caused to stop
running and is prevented from starting (for example, the output circuit is interrupted and
disables the flow of current)
3.18
ON-state
state of the output(s) of the ESPE in which the machine under control is allowed to run (for
example, the output circuit is complete and enables the flow of current)
3.21
response time
Add, after the text of definition 3.21, the following new notes:
NOTE 1 When an ESPE includes a safety-related data interface, the response time is defined at the output of the
safety-related data interface.
NOTE 2 When a safety-related communication interface is included in the ESPE enclosure, then the response
time is defined at the output of the safety-related communication interface. In this case, the response time is also
dependent on the protocol and architecture of the communication network.
NOTE 3 If an ESPE has both a safety-related data interface and OSSDs, the ESPE can have a different response
time for the safety-related data interface and for the OSSDs.
Add, on page 21,after definition 3.28, the following new definitions:
3.29
safety-related data interface
direct connection (peer-to-peer) interface between the output of the ESPE and the safety-
related communication interface that is used to represent the status of the OSSD(s)
NOTE 1 A data interface will not have addressing capability.
NOTE 2 The safety-related data interface can be bi-directional.

– 4 – 61496-1 Amend. 1 © IEC:2007
3.30
safety-related communication interface
safety-related connection to a standardized communication network intended for safety-
related control functions
Page 23
4 Functional, design and environmental requirements
4.1.3 Types of ESPE
Add, at the end of this subclause, the following last sentence:
When a single safety-related data interface is used to perform the functions of the OSSD(s),
then the data interface and associated safety-related communication interface shall meet the
requirements of 4.2.4.4. In this case, a single safety-related data interface can substitute for
two OSSDs in a type 3 or type 4 ESPE.
4.2.2.1 General
Add, on page 24, at the end of the subclause, the following text:
When an ESPE uses a safety-related communication interface to perform the OSSD functions,
the fault-detection requirements in 4.2.2.3 to 4.2.2.5 can be modified to include requirements
given in IEC 62061/IEC 61508 in accordance with the appropriate SIL (for example, SIL 3 for
Type 4, SIL 2 for Type 3 and SIL 1 for Type 2).
4.2.4.1 General
Add, on page 31, the following last paragraph:
A reference to an OSSD action (for example, go to the OFF-state) will also mean a
corresponding action of a safety-related data interface. A single safety-related data interface
can meet the requirements of having two OSSDs.
4.2.4.4 Data communication interfaces (I/O)
Replace, on page 33, the title and text of this subclause by the following:
4.2.4.4 Safety-related data interface and safety-related communication interface
When the sensing device is actuated during normal operation, the ESPE shall respond by
sending information indicating the status of the sensing device or ESPE through a safety-
related data interface. The status information is converted to a data telegram by a safety-
related communication interface.
The safety-related data interface shall have the same protection against faults as is
appropriate for the type of ESPE.
Depending on the ESPE design, the safety-related communication interface can either be
external in a separate enclosure (Figure 1a) or it can be integrated in the same enclosure of
the ESPE (Figure 1b).
The safety-related communication interface shall meet the relevant requirements of
IEC 62061/IEC 61508 for an appropriate SIL (for example, SIL 3 for Type 4, SIL 2 for Type 3
and SIL 1 for Type 2) in addition to the requirements of this standard (IEC 61496-1).

61496-1 Amend. 1 © IEC:2007 – 5 –
When the safety-related communication interface is integrated in the ESPE, the entire ESPE
shall meet the relevant requirements of IEC 62061/IEC 61508.
NOTE Because of the specific technology of communication interfaces, different standards from IEC 61496-1
apply. To avoid overlapping with other standards, functional requirements for the safety-related communication
interface are not defined in this standard.

Sensing device Sensing device
Control/monitoring Control/monitoring
device device
Safety-related data
interface
Safety-related data ESPE
interface
Safety-related
communication
interface
Safety-related
communication interface
a) b)
IEC  1798/07
Figure 1 – Examples of ESPEs using safety-related communication interfaces

4.2.6 Adjustment means
Replace this subclause with the following text:
All adjustment means shall be so designed that a failure to danger is not possible at any point
in the range of adjustment. A failure in the adjustment means shall not cause an unintended
change to the configuration of the ESPE.
4.2.11.2 Requirements
Replace, on page 35, item a) of this subclause by the following new item a):
a) The software, device programme and the device function design shall be developed in
accordance with IEC 61508-3 for the appropriate SIL (for example, SIL3 for Type 4, SIL2
for Type 3 or SIL1 for Type 2).

4.3.2.2 Supply voltage interruptions
Add, on page 39, at the end of the subclause, the following new paragraph:
When the ESPE is designed to be supplied from a specific type of power supply(s) (for
example, supplied direct from a safety-related communication interface), the supply
interruptions in this clause may be applied to the primary input of the specified power supply
instead of direct to the ESPE.

– 6 – 61496-1 Amend. 1 © IEC:2007
Page 45
5 Testing
5.1.1.2 Operating condition
Add, at the end of the subclause, the following new paragraph:
Where a safety-related data interface is used in place of an OSSD(s), the ESPE shall be
connected to a communication system in accordance with the supplier’s instructions that has
a means of monitoring the ESPE status.
Add, on page 47, after 5.1.2.2, the following new subclause and figure:
5.1.2.3 Environmental test conditions for an ESPE intended to be used with a safety-
related communication interface
The ESPE and the safety-related communication interface shall be tested together (see
Figure 2). Due to the fact that the safety-related communication interface does not show a
static output signal, it is necessary to use a data receiver. The test setup consists of the
equipment under test and a data receiver (for example, a PLC or monitoring device) which
indicates the status
...