Mitsubishi Electric CC-Link IE-NZ2GNSS2-16DTE, User Manual

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156
APPX
Appendix 5 EMC and Low Voltage Directives
Precautions for use of safety programmable controller
Users must prove that their entire safety system complies with the safety standards and the Machinery Directive. The third-
party certification organization will validate the safety of product for the entire safety system, including a safety programmable
controller and safety components.
■
Target failure measure (PFDavg/PFH) calculation
To establish a safety system, calculate the target failure measure (PFDavg/PFH) for each safety application (safety function)
based on the PFDavg/PFH values of the safety programmable controller and connected safety components. The target failure
measure (PFDavg/PFH) is the reliability target value for each Safety Integrity Level (SIL) defined in IEC 61508 and can be
calculated by the following formula.
PFDavg/PFH = A + B + C + D......Calculation formula of PFDavg/PFH
*1 For the values of PFDavg/PFH, refer to the manuals for the safety components used.
The following table lists the PFDavg/PFH of safety remote I/O modules.
*2 Proof test interval is 5 years.
■
PL evaluation described in ISO 13849-1
For the PL evaluation described in ISO 13849-1, use the MTTF
D
(mean time to dangerous failure) and the DCavg (average
diagnostic coverage) listed in the following table.
Variable Definition
A Total PFDavg/PFH of the safety CPU module, power supply module, base unit, and CC-Link IE TSN master module
B PFDavg/PFH of the CC-Link IE TSN remote I/O module (with safety functions)
(1) When safety input device(s) and safety output device(s) are connected to the same CC-Link IE TSN remote I/O module (with safety
functions): B = B1
(2) When safety input device(s) and safety output device(s) are connected to the different CC-Link IE TSN remote I/O modules (with safety
functions): B = B1 + B2
B1 PFDavg/PFH of the CC-Link IE TSN remote I/O module (with safety functions) to which safety input device(s) is connected
B2 PFDavg/PFH of the CC-Link IE TSN remote I/O module (with safety functions) to which safety output device(s) is connected
C
*1
PFDavg/PFH of safety input device(s)
D
*1
PFDavg/PFH of safety output device(s)
Module PFDavg PFH(/h)
*2
NZ2GNSS2-8D 1.38

10
-5
6.12

10
-9
NZ2GNSS2-8TE 1.37

10
-5
5.49

10
-9
NZ2GNSS2-16DTE 1.46

10
-5
9.25

10
-9
Module MTTF
D
DCavg
NZ2GNSS2-8D 243 years 97.0%
NZ2GNSS2-8TE 271 years 96.8%
NZ2GNSS2-16DTE 161 years 97.7%