4.4
Electrical integration
4.4.1
Internal circuitry
Figure 5: Internal circuitry XTDO
4.4.2
Safety outputs
Important information
WARNING
Ineffectiveness of the protective device
In the event of a fault, a single safety output (Q) can switch off after a delay or briefly
switch to High. The response time increases depending on the configuration of the
output. The dangerous state may not be stopped or not be stopped in a timely manner
in the event of non-compliance.
b
Take the increased response time into consideration in the risk analysis.
b
Take the possible reduced safety level into consideration in the risk analysis.
Fault detection by testing
The following faults can be detected by testing an element:
•
Short-circuits between any of the safety outputs.
You can detect a cross-circuit between the safety outputs of 12 sequential mod‐
ules.
•
Short circuits to 24 V DC (to High) on safety outputs.
•
Actuator wiring short-circuits to 24 V.
PROJECT PLANNING
4
8024583/2020-11-10 | SICK
O P E R A T I N G I N S T R U C T I O N S | Flexi IO XTDO1
15
Subject to change without notice
