Monitoring Function
Fault reaction/risk mitigation
Safety Response Time
1. Monitor Direction of Force Feedback
1. Signal Safety Error
3. Force Feedback Safe Stop
370 ms
2. Monitor Operator Notification
1. Signal Safety Error
170 ms + OPN pattern period (8s)
Safe transmission of joystick angle position
The joystick’s single axis angular position in range of -30° to +30° is transmitted periodically via CAN (see
Safe finger function (Button auto-guidance)
The state of the Safe Finger Function is transmitted periodically via CAN (see
on page 11).
Monitoring of force feedback direction
A monitoring function that monitors force and direction of the grip torque.
Note: This function prevents the motor shaft from moving more than a defined amount in the
unintended direction. (IEC 61800-5-2:2016, sec. 4.2.4.11)
Monitoring of operator notification
A monitoring function that monitors the operator notification to ensure that the machine operator is
correctly notified, in case of a failures only.
Joystick safety perameters
Safety parameter
Specification
Description
SIL
2
IEC 61508:2010
PFH
4,2 ∙ 10-8 [1/h]
Component type
B
SFF
98 %
DC
98 %
Architecture /category
1oo2D
Architecture /category
Monitoring of Force Feedback
1oo1
Proof test interval/mission time
8 Hours
Reliability handbook
Siemens SN29500 Calculations are performed at an average temperature
equal to 80 °C
B10d Joystick
17.000.000
[cycles]
Mechanical Joystick
B10d Safe Finger Function (Button
Auto-Guidance)
1.000.000 [cycles] Mechanical Joystick Safe Finger Function (Button Auto-
Guidance)
AgPL/PL
d
Maximum achievable performance level
MTTFd
513 years
ISO 13849:2014/2015
ISO 25119:2018/2019
DCavg
98 %
ISO 13849:2014/2015
Category
3
ISO 13849:2014/2015
ISO 25119:2018/2019
Category for
Monitoring of Force Feedback
2
ISO 13849:2014/2015
ISO 25119:2018/2019
User and Safety Manual
PLUS+1® JS1-H Steer by Wire
Functional Safety
18 |
©
Danfoss | December 2022
AX436683569858en-000101
