Functions
Leuze electronic MLC 530 20
4.6 Linkage
Through linkage, the behavior of the receiver can be controlled via a two-channel safety circuit (see
figure 7.9).
The upstream safety sensors and operational controls release the OSSDs of the receiver for safety-rele-
vant purposes if the control circuit has been switched as expected regarding polarity and time behavior
and the protective field is free.
The following upstream sensors and operational controls are possible regarding the linkage:
• Safety sensor with two-channel contact-based switching output (normal closed contact), e.g. Safety
Switch, E-Stop Rope Switch, Safety Position Switch and the like, see chapter 4.6.1 „Contact-based
safety circuit“.
• Safety sensor with two-channel electronic OSSD switching output, see chapter 4.6.2 „Linking of elec-
tronic safety-related switching outputs“.
E-Stop buttons connected to the receiver act only on the safety circuit to which the AOPD is assigned.
Thus, it can be considered to be an area E-Stop. The regulations for E-Stops apply to it, including those
in accordance with EN 60204-1 and EN ISO 13850, among others.
In this case, observe the regulations for E-Stops.
If linkage is utilized, the response time of the linked device is extended by 3.5 ms.
Concerning the safety distance, place the more critical devices at the end of the electrical chain and as
close as possible to the downstream safety circuit.
4.6.1 Contact-based safety circuit
The function releases the OSSDs via an upstream two-channel contact-based safety circuit. It can be used
to monitor locks and the position of inserted objects in the event of fixed or floating blanking, e.g. via coded
plugs on short cables or via Safety Switches with separate actuators (see chapter 7.5 „Operating
mode 3“). This prevents an unwanted start-up when parts are removed from the protective field.
Examples for the connection can be found in chapter “Electrical connection” (see figure 7.6).
The safety sensor only switches on if the following conditions have been fulfilled:
• The protective field is free and blanked beams are interrupted.
• The safety circuit is closed or both contacts have been closed simultaneously within 0.5 s.
Activation of the function
The contact-based safety circuit can be used in operating modes 1, 2 and 3 (see chapter 7 „Electrical
connection“).
4.6.2 Linking of electronic safety-related switching outputs
This function is used to construct a serial connection of devices with electronic safety OSSD switching
outputs (see figure 7.9). The OSSDs of an upstream safety device release the OSSDs of the Safety Light
Curtain as the central safety device through 2 channels. The upstream safety device also monitors the
cross circuits. Regarding the downstream safety circuit, a linked system behaves like a single device, i.e.
only 2 inputs are necessary in the downstream Safety Relay.
Magnetically coded sensors may not be linked since the Safety Light Curtain does not monitor
them.
WARNING
Impairment of the protective function due to faulty signals
Series connection of devices with safety-related switching outputs (OSSDs) may only be created with the
following Leuze electronic safety sensors: SOLID-2/2E, SOLID-4/4E, MLD 300, MLD 500, MLC 300,
MLC 500, RS4, RD800 or COMPACT
plus
.
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