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10. Safety system
MiR250 Shelf Carrier User Guide (en) 03/2021 - v.1.4 ©Copyright 2021: Mobile Industrial Robots A/S.
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MiR Shelf Carrier 250 safety functions
MiR Shelf Carrier 250 uses the electrical interfaces between the top module and the
robot to communicate safety related information that is used for additional safety
features. This includes monitoring the pin positions and safety contactors to make sure
the pins are in the right position and that they do not change positions without other
safety functions being in place.
These functions are described in further detail in the following sections.
The diagram in
shows the inputs to these functions and how they are all
connected and monitored in the safety PLC. The safety PLC is able to switch the safety
contactors to cut off power to the robot motors and the top module whenever a Protective
or Emergency stop is triggered. Also, the safety PLC sends information to the robot computer
to be displayed in the robot interface (go to
Monitoring > Hardware health
) and to indicate
the robot's status through the status lights and the speaker.
Figure 10.3. Overview of components involved in each safety function and interface. When a safety function is
triggered, the safety PLC switches the STO and brake contactors so the brakes, motors, and power supply to the
top module no longer receive power.