Safety Bus Manual — P/N LS10177-000HI-E:B 02/21/2019 8
Useful Information
Glossary
Related Documentation
For further details and information on the Safety Bus system, please refer to the following docu-
ments:
Safety-related
Term used to describe systems that must carry out one or more safety functions to ensure that the risk is kept
within the acceptable range.
Hot Plug Hot plug refers to a module that can be replaced without the need to power down the system.
Availability
The availability of a module is the percentage of time during which it is operating. Generally this value is a
percentage and is obtained by applying the formula below:
MTBF
The MTBF (Mean Time Between Failures) is the predicted time, calculated by the manufacturer, between
failures of a module during operation.
MTTR
The MTTR (Mean Time To Repair) is the time necessary to repair a failed module. In H-S81-HS systems
repair means replacement of the faulty module, which is usually estimated at 8 hours.
SIL
The SIL (Safety Integrity Level) is the level of integrity provided by a safety function. There are four safety
integrity levels: 1, 2, 3, and 4. “SIL 4” is the highest level of safety integrity, while “SIL 1” is the lowest.
ATEX The directive that consists of two European Union directives:
94/9/EC - Equipment and protective systems intended for use in potentially explosive atmospheres; the
directive is aimed at manufacturers of equipment intended for use in potentially explosive atmospheres and
requires certification of said products; and
99/92/EC - defines minimum health and safety requirements for workplaces with a potentially explosive
atmosphere; it is applied to atmospheres at risk from explosion, where certified installations and equipment
are put into operation and is therefore aimed at the user.
Document Number Title
LS10113-000HI-E H-S81-HS Installation and Operation Manual
LS10115-000HI-E H-S81-HS Safety Manual
LS10180-000HI-E PRO-HS81 Programming Software
ST-021-EN IRIDE Supervision Graphics Program
ST-057-EN OPC Server
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