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Wiring
3.10.4 Safety parameters
To comply with the EN ISO 13849-1 PL e and IEC 61508 SIL3 standards, you have to monitor
the EDM signals with the controller. If you do not monitor the EDM signals, the system only
meets the IEC 61508 SIL2 standard. Refer to the following tables for the related standards.
Overseas specification
Machinery Directive
EMC Directive
(Functional safety)
Standard
IEC / EN 61508: 2010
EN IEC 62061:2021
IEC 61800-5-2: 2016 / EN 61800-5-2: 2017
EN ISO 13849-1: 2015
IEC / EN 61326-3-1: 2017
IEC 61000-6-7: 2014 / EN 61000-6-7: 2015
Item
Description
Safety function
HFT
Subsystem
Safety function
Hardware fault tolerance
Subsystem
SIL
Safety integrity level
PFH
Response time
Probability of dangerous
failure per hour [h-1]
Response time
Category Category
PL
MTTFd
DC
Performance level
Mean time to dangerous
failure
Diagnostic coverage
Mission time Mission time
Standard
IEC / EN 61800-5-2
IEC / EN 61508
IEC / EN 61508
IEC / EN 61508
EDM signal
monitoring with
controller
STO
1
Type A
SIL3
EN IEC 62061
IEC / EN 61508
EN IEC 62061
IEC / EN 61508
EN ISO13849-1:
2015
EN ISO13849-1:
2015
EN ISO13849-1:
2015
EN ISO13849-1:
2015
EN ISO13849-1:
2015
maximum SIL3
1.61x10-9 [1/h]
(1.61% of SIL3)
≤ 10 ms
Category 3
PL e
High
Medium
20 years
No EDM signal
monitoring
STO
1
Type A
SIL2
maximum SIL2
1.66x10-9 [1/h]
(0.166% of SIL2)
≤ 10 ms
Category 3
PL d
High
Low
20 years
3
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