Leuze electronic MSI 200 Series User Manual page 83

Start interlock
Next steps
Check values (CRC)
Leuze electronic
Start interlock active?
WARNING: Unintended machine start-up
Canceling the start interlock can result in unintended machine start-up.
Before canceling the start interlock, make certain that canceling cannot result in a dan-
•
gerous machine state.
When planning the machine or system, make certain that canceling the start interlock is
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possible only if the danger zone is visible.
If a start interlock has been predefined in the configuration, it will be active following start-up.
An active start interlock must be canceled by pressing a reset button which is connected to the
safety module according to the configuration.
For further information, please refer to "System start-up and restart behavior" on page 19.
If the safety module is not initialized correctly, proceed as described in chapter "Problems
and solutions" on page 95.
Next, continue with the function test.
See chapter "Function Test" on page 87.
Check values (CRC)
To ensure that any distortions to the configuration data during transmission to the safety
module can be reliably detected, a check value (CRC) is calculated in the configuration soft-
ware when the project is checked.
The safety module also determines the check value for the downloaded data.
If the check values on the safety module and in the configuration software are identical, all
data has been saved on the safety module without distortion. If the check values differ, a cor-
responding error message is output.
Deviating check values through subsequent changes
The check value (CRC) will also differ if subsequent modifications have been made to the
project in the configuration software, but have not yet been downloaded to the safety mod-
ule.
Note
For example, the following tasks are evaluated as changes in the project:
– Moving an object
– Making a change to the project documentation
Recommendation
Record the check value (CRC) after commissioning and subsequent validation in the ma-
chine protocol to understand subsequent project changes.
Configuration and commissioning
MSI 100/200 83