Mitsubishi Electric MELFA CR800 Series Instruction Manual page 14

1 FUNCTIONS AND CONFIGURATION
Item
Safety Environment
extension
unit
Input signal
Output signal
Note 1: Refer to 8.1 Appendix 1: Selection Conditions for 24VDC Stabilized Power Supply.
The following table shows the safety performance of the CR800 controller.
Function
STO Safety Level
Mean time to dangerous failure
(MTTFd)
Diagnostic coverage (DC)
Probability of dangerous failure
per hour (PFH) (Note 2)
Hardware Fault Tolerance
Mission time
Diagnostic test interval
Systematic capability
Safety Level
Mean time to dangerous failure
(MTTFd)
Diagnostic coverage (DC)
Probability of dangerous failure
per hour (PFH) (Note 2)
Hardware Fault Tolerance
Mission time
Diagnostic test interval
Systematic capability
SS1, SS2, Safety Level
SOS, SLS,
SLP
Mean time to dangerous failure
(MTTFd)
Diagnostic coverage (DC)
Probability of dangerous failure
per hour (PFH) (Note 2)
Hardware Fault Tolerance
Mission time
Diagnostic test interval
Systematic capability
Note 1: To use this product at a performance level of SIL 3, Category 4, PL e, refer to "4.6.1 Test pulse diagnosis
(EMG)".
Note 2: The robot controller PFH or PFHd (Probability of Dangerous Failure per Hour).
Note 3: For systems using the I/O signals of the safety extension unit, add the PFH value in the table below.
Safety performance of the safety extension unit complies with PL d/Category 3.
MTTFd
[year]
256
1-4 Specifications
Installation Indoors
environment Place where no intense
electromagnetic energy is
generated
No roughness or tilt on the
installation surface
Eight routes (duplex signal)
Four routes (duplex signal)
Item
SIL 3 (IEC 61508:2010)
Category 4, PL e
(EN ISO 13849-1:2015)
MTTFd ≥ 100 years
DC = 99%
PFH = 1.40 × 10
1
20 years
1000ms
SC3
SIL 2 (IEC 61508:2010)
Category 3, PL d
(EN ISO 13849-1:2015)
MTTFd ≥ 100 years
DC = 90%
PFH = 1.57 × 10
1
20 years
1000ms
SC2
SIL 2 (IEC 61508:2010)
Category 3, PL d
(EN ISO 13849-1:2015)
MTTFd = 24 years
DC = 90%
PFH = 3.42 × 10
1
20 years
1000ms
SC2
DC
[%]
90
Description
Description
[1/hour]
-8
[1/hour]
-8
[1/hour]
-7
PFH
[1/hour]
1.76 × 10
-8
Remarks
No direct sunlight.
Do not install the
unit on very rough
surfaces.
-
-
Remarks
Performance when:
• External emergency
stop input when the test
pulse diagnosis settings
are enabled (Note 1)
Performance when:
• External emergency
stop input when the test
pulse diagnosis settings
are disabled (factory
settings)
• Door switch input
• Mode selector switch
input
• Safety extension unit's
safety input (Note 3)
(Note 3)