Terminology - Mitsubishi Electric MELSEC-QS Series Safety Application Manual

Generic term/
abbreviation
Safety CPU module
Safety power supply
module
Safety programmable
controller
Standard programmable
controller
Safety input
Safety output
Safety communication
Safety application

TERMINOLOGY

Term
Safety component
Safety-related system
Safety functions
Safety measure
Category
PL (performance level)
SIL
Risk
Risk assessment
Link ID
Target failure measure
NC
NO
Close contact
Open contact
Dark test
Abbreviation for the QS001CPU type safety CPU module
Abbreviation for the QS061P-A1 and QS061P-A2 type safety power supply modules
Generic term for a safety CPU module, a safety power supply module, a safety main base unit,
a CC-Link Safety master module, CC-Link Safety remote I/O modules, and a CC-Link IE Field
Network master/local module (with safety functions)
Generic term for MELSEC-Q series, MELSEC-L series, MELSEC-QnA series, MELSEC-A
series, and MELSEC-FX series modules (This term is used to distinguish a programmable
controller that uses these modules from a safety programmable controller.)
Generic term for the signals that are input to the safety programmable controller for realizing the
safety functions
Generic term for the signals that are output from the safety programmable controller for realizing
the safety functions
Function to exchange safety data between safety stations on the same network
Generic term for the applications that are operated using the safety programmable controller for
realizing the safety functions
Equipment such as the safety compatible sensor and actuator
System executing a safety functions to be required
Functions to be realized for protecting a human from machinery hazards
Measure for reducing the risk
Safety level standardized in EN954-1. The safety level is classified into 5 levels of B and 1 to 4.
Safety level specified in ISO13849-1:2015. The safety level is classified into five levels of "a" to
"e".
Safety level which is standardized in IEC61508. The safety level is classified into 4 levels of SIL1
to SIL4.
Degree of hazards, which is the combination of the occurrence probability and degree of an injury
and a health problem
To clarify hazards in machinery and assess the degree of the hazards
Unique network identifier which is given to each network of the CC-Link Safety
Target value of reliability for each SIL level standardized in IEC61508. There are PFD and PFH
depending on the operation frequency of the safety functions.
Abbreviation for normal close contact which is normally closed, but opened when a switch or other
function is operated
Abbreviation for normal open contact which is normally opened, but closed when a switch or other
function is operated
Same as NC
Same as NO
Outputs a pulse to turn off the input/output when it is on, and performs the failure diagnostics to
contacts including external equipment
Description
Description
A
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