Glossary
SIPART PS2 with PROFIBUS communication
Operating Instructions, 09/2007, A5E00127926-07
283
Protocols
Protocols contain information about data formats, time sequences and error handling when
exchanging data between computers.
A protocol is a convention about establishing, monitoring and terminating a connection.
Different protocols are required for a data connection. Protocols can be assigned to every
layer of the reference model. Transport protocols are used for the lower four layers of the
reference mode and higher protocols are used for control, data provision and application.
Safety function
Defined function executed by a safety-instrumented system with the objective of attaining or
maintaining a safe status of the system by taking a defined hazardous incident into account.
Example: limit pressure monitoring
Safety function
A defined function executed by a safety-instrumented system with the objective of achieving
or maintaining a safe system status taking into account a defined dangerous occurrence.
Example:
Limit pressure monitoring
Safety Integrity Level
→
Safety-instrumented system
A safety-instrumented system (SIS) executes safety functions that are required to attain or
maintain the safe status in a system. It consists of sensors, logic unit/control system and final
controlling elements.
Example: a safety-instrumented system consists of a pressure transmitter, a limit signal
indicator and a servo valve.
Safety-instrumented system
A safety-instrumented system executes the safety functions that are required to achieve or
maintain a safe status in a system. It consists of a sensor, logic unit/control system and final
controlling element.
Example:
A safety-instrumented system is made up of a pressure transmitter, a limit signal sensor and
a control valve.
Sensor
Converter that converts mechanical or other non-electric variables into electric signals.
Содержание SIPART PS2 PA 6DR55 Series
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