Device description
Leuze electronic
MSI-SR5B
9
3
Device description
The safety relay serves as a link between one or more safety-related sensors and the machine control.
These sensors may be
• type 4, type 3 or type 2 (self-testing) optoelectronic protective devices (AOPD)
• safety switches,
• safety locking devices,
• E-Stop buttons,
• safety rope switches or
• combinations of these sensors.
The safety relay includes a start/restart interlock that can be activated via the connection terminals, a
contactor monitoring function (EDM) and features two safety-related relay outputs (OSSDs) and LED
displays for status control.
Two terminal groups allow the safety relay to connect the sensors and signals their aggregate data via the
OSSDs. Only if the sensors are switched-on on both channels and on both terminal groups is it possible
to switch through - taking into account RES and EDM.
If one of the sensors switches off, this results in the immediate shutdown of the OSSDs of the safety relay.
With appropriate bridging (see table 7.1), the evaluation can be reduced to just one sensor.
The safety system consists of the safety relay and the safety components connected to it. It enables
machines or systems to achieve a safe state before persons can be endangered. Through the flexible eval
-
uation of two - even different - sensors, the safety relay makes available a compact, economical safety
relay which, with Performance Level PL e in accordance with EN ISO 13849-1 and SIL 3 in accordance
with EN 61508:2001, satisfies the highest safety level.
Figure 3.1: MSI-SR5B with screw terminals
Figure 3.2: MSI-SR5B with spring-cage terminals
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