ISO 13577-4:2022 工業炉および関連する処理装置—安全性— Part 4: 保護システム | ページ 6

3.1

final element

part of a protective system (3.6) , that implements the physical action necessary to achieve or maintain a safe state

Note 1 to entry: Examples are valves, switch gears, and motors, including their auxiliary elements, for example, a solenoid valve and actuator if involved in the safety function.

[SOURCE:IEC 61511-1:2016, 3.2.22, modified —"BPCS or SIS" has been changed to read"protective system" in the definition.]

3.2

flame detector device

device by which the presence of a flame is detected and signalled

Note 1 to entry: It can consist of a flame sensor (3.9) , an amplifier, and a relay for signal transmission.

[SOURCE:ISO 13574:2015, 2.65, modified — The second sentence in the original definition is presented as Note 1 to entry.]

3.3

logic function

function which performs the transformations between input information [provided by one or more input functions or sensors (3.9) ] and output information [used by one or more output functions or final elements (3.1)]

Note 1 to entry: Logic functions are executed by the logic solver (3.4) of a protective system (3.6) .

[SOURCE:IEC 61511-1:2016, 3.2.35, modified —"input functions" has been changed to read"input functions or sensors" and"output function" had been changed to read"output function or final elements" in the definition; Notes 1 and 2 to entry in the original definition had been deleted and Note 1 to entry has been added.]

3.4

logic solver

part of a protective system (3.6) that performs one or more logic function(s) (3.3)

Note 1 to entry: Examples are electrical systems, electronic systems, programmable electronic systems, pneumatic systems, and hydraulic systems. Sensors (3.9) and final elements (3.1) are not part of the logic solver.

[SOURCE:IEC 61511-1:2016, 3.2.36, modified —"either a BPCS or SIS" has been changed to read"a protective system" in the definition; Note 1 to entry in the original definition has been deleted.]

3.5

programmable (logic) controller

PLC

digitally operating electronic operating system, designed for use in an industrial environment, which uses a programmable memory for the internal storage of user-oriented instructions to implement specific functions such as logic, sequencing, timing, counting and arithmetic, to control, through digital and analogue inputs and outputs, various types of machines or processes

[SOURCE:IEC 61131-1:2003, 3.5, modified — The second sentence of the original definition and Note 1 to entry have been deleted.]

3.6

protective system

instrumented system used to implement one or more safety-related instrumented functions which is composed of any combination of sensor(s) (3.9) , logic solver(s) (3.4) , and final elements (3.1)

Note 1 to entry: This can include safety-related instrumented control functions or safety-related instrumented protection functions or both.

Note 2 to entry: For example, see Figure 2.

[SOURCE:ISO 13574:2015, 2.138, modified — Note 1 to entry has been merged with the definition.]

3.7

safety bus

bus system and/or protocol for digital network communication between safety devices (3.8) , which is designed to achieve and/or maintain a safe state of the protective system (3.6)

[SOURCE:ISO 13574:2015, 2.164]

3.8

safety device

device that is used to perform protective functions, either on its own or as a part of a protective system (3.6)

3.9

sensor

device that produces a signal based on a process variable

3.10

system for permanent operation

system, which is intended to remain in the running position for longer than 24 h without interruption

[SOURCE:IEC 60730-2-5:2013+AMD1:2017+AMD2:2020 CSV, 2.5.101]

3.11

system for non-permanent operation

system, which is intended to remain in the running position for less than 24 h

[SOURCE:IEC 60730-2-5:2013+AMD1:2017+AMD2:2020 CSV, 2.5.102]