System description
Leuze electronic
MSI 100/200
19
2.3
Safe state
The safe state of an output terminal block is defined as the power off mode (signal value "0").
The safe state can be assumed by the MSI 100/200 system in the following cases:
1. Operating state (by triggering the safety function)
2. Error detection in the peripherals
3. Device error
4. Configuration error
5. Error detection in safe communication
2.4
System start-up and restart behavior
Start-up
Start-up
refers to the behavior of the MSI 100 and MSI 200 safety modules and the optional
safe extension modules after switching on (or applying the supply voltage) and after configur-
ing via USB interface or AC-MSI-CFG1.
Unless a start interlock is configured, the safety module starts up immediately following suc-
cessful configuration (i.e., after pressing the "Confirm" button). The safe inputs are evaluated
and the outputs controlled accordingly.
Restart
Restart refers to the behavior of the safety modules and the optional safe extension modules
after the safety function is triggered and the subsequent return to normal operation. Normal
operation is restored, e.g., by unlocking the E-Stop command device, after which safe opera-
tion is again possible.
With an active start/restart interlock, the corresponding safe module output remains in the safe
state. This prevents an undesired start/restart of a machine controlled by the relevant output.
WARNING: Unintended machine start-up
Start/restart after switching on voltage as well as the discontinued demand for the safety
function can result in undesired machine start-up.
•
Note the following:
–
The module starts up immediately after completing the configuration.
–
The module restarts immediately if the trigger of the safety function is reset.
•
If automatic start/restart is not desired, configure automatic start/restart accordingly in
the safety logic.
