Rockwell Automation 440R MSR300 Modular Safety Control System - Manual (Page 10)

MSR300 Safety System Manual
Rockwell Automation
MSR300 Manual.doc Pg 10 of 85
3.1.1 Safety Standards
MSR300 Series Modules conform to the Essential Health & Safety Requirements
(EHSR's) of the European Machinery Directive (98/37/EC), the relevant requirements of
the Low Voltage Directive (73/23/EEC as amended by 93/68 EEC) and the essential
protection requirements of the EMC Directive (89/336/EEC as amended by 92/31 EEC).
The MSR310P also conforms to EN 292, EN 60204-1, EN61508, EN 954-1, and UL 508.
3.1.1.1 EN
954-1
This product conforms to Category 4 of EN954-1: Safety-Related Parts Of Control
Systems.
The main stipulations of this standard are:
Safety-related parts of control systems conforming to Category 4 shall be designed so
that:
• A single fault in any of these safety-related parts does not lead to a loss of the
safety function.
• The single fault is detected at or before the next demand upon the safety functions,
e.g. immediately at switch on, at end of a machine operating cycle. If this detection
is not possible, then an accumulation of faults shall not lead to a loss of the safety
function.
If the detection of certain faults is not possible, at least during the next check-up after the
occurrence of the fault, for reasons of technology or circuit engineering, the occurrence of
further faults shall be assumed. In this situation the accumulation of faults shall not lead
to the loss of the safety function.
Fault review may be stopped when the probability of occurrence of further faults is
considered to be sufficiently low. In this case the number of faults in combination, which
need to be taken into consideration, will depend upon the technology, structure and
application but shall be sufficient to meet the detection criteria.
3.1.1.2 IEC/EN
61508
This product has been designed to conform to SIL 3 of IEC/EN 61508: Functional Safety
of Electrical / Electronic / Programmable Electronic Safety-Related Systems, Parts 1-7,
1998.
IEC/EN 61508 relates to the functional safety of electrical, electronic, and programmable
electronic safety-related systems. These are referred to as Safety Instrumented Systems
(SIS). IEC/EN 61508 is an umbrella standard applicable to all industries. Safety Integrity
Level (SIL) is a statistical representation of the reliability of the SIS. Four SIL levels are
defined: SIL 1 through SIL 4. The higher the SIL number, the more reliable or effective