Bernecker + Rainer 4MP181.0843-03, User Manual

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Standards and Certifications • Standards and Definitions for Safety Technology
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117 Mobile Panel User's Manual V 1.5
9. Standards and Definitions for Safety Technology
Stop functions according to IEC 60204-1/11.98 (electrical equipment for machines, part 1:
general requirements)
The following three stop function categories exist:
The necessary stop functions must be determined based on a risk evaluation for the machine.
Stop functions in category 0 and category 1 must be able to function regardless of the operating
mode. A category 0 stop must have priority. Stop functions must have priority over assigned start
functions. Resetting the stop function is not allowed to cause a dangerous state.
Emergency stops according to IEC 60204-1/11.98 (electrical equipment for machines, part
1: general requirements)
The following requirements are valid for emergency stops in addition to the requirements for the
stop functions:
• It must have priority over all other functions and operations in all operating modes.
• The power to the machine drive elements which can cause a dangerous state must be
switched off as quickly as possible without creating other dangers.
• Resetting is not allowed to cause a restart.
• The E-stop function must not reduce the effectiveness of the safety equipment or of
equipment with safety-related functions.
• The E-stop function must not interfere with equipment designed to free personnel from
dangerous situations.
Emergency stops must be category 0 or category 1 stop functions. The necessary stop function
must be determined based on a risk evaluation for the machine.
For emergency stop function in stop category 0, only hard wired, electromechanical equipment
can be used. Additionally, the function is not allowed to depend on electronic switching logic
(hardware or software) or the transfer of commands via a communication network or data
connection.
1)
Category Description
0 Stop by immediately switching off the power to the machine drive elements (i.e. uncontrolled stop).
1 A controlled stop, the power to the machine drive elements remains on until the stop procedure is completed. The power is switched
off after the stop is complete.
2 A controlled stop, the power to the machine drive elements is not switched off.
Table 63: Overview of stop function categories
1) In accordance to the national foreword for the valid German version of IEC 60204-1/11.98, it is determined that electronic equipment
(and especially emergency stop systems) can be used regardless of the stop category, if e.g. it provides the same safety using the
standards EN 954-1 and/or IEC 61508 as required by IEC 60204-1.