Functions
Leuze electronic GmbH + Co. KG
MSI-TR1B / MSI-TR2B
12
4
Functions
After switching on the safety relay via the start input, the functional capability of the connected safety
sensors is cyclically monitored every two seconds.
The potential-free safety relay outputs are intended for shutting down a dangerous movement. Further
integrated functions are listed in the following table.
Table 4.1:
Functions of the different versions
4.1
Start/restart interlock (RES)
The start/restart interlock prevents automatic start-up of the system (e.g. if the protective field is again clear
or if an interruption in the voltage supply is restored). The operating personnel must make certain that no
people are present in the danger zone before the system is manually re-enabled.
The default factory setting for this function is active.
4.2
Contactor monitoring (EDM)
The safety relay monitors the feedback circuits of connected contactors. The signal at the EDM input is
compared to the state of the OSSDs. While the OSSDs are switched on, the feedback circuit is open (high-
impedance); while the OSSDs are switched off, 24 V is applied to the EDM input.
The reaction at the EDM input with respect to the OSSDs is delayed by maximum 500 ms.
Function
MSI-TR1B
MSI-TR2B
Periodic function test
Start/restart interlock (RES), selectable
Contactor monitoring (EDM), selectable
Indication output "Safety ON"
"Error" signal output
