Operating instructions esl, Important – EUCHNER ESL-IH-AR User Manual
Page 15
Operating Instructions ESL
15
Connection of several ESL devices in an AR switch
chain
Important!
Ì
A switch chain may contain a maximum of 20 safety switches.
Ì
In the estimation of the PL for the overall system, a maximum value of
100 years can be assumed for the MTTF
d
according to the limit value in
EN ISO 13849-1:2008, section 4.5.2. This corresponds to a minimum value
for the PFH
d
of 2.47x10
-8
/h.
The devices are connected in series using plug connectors and Y-distributors. If
a safety door is opened or if a fault occurs on one of the switches, the system
shuts down the machine. A higher level control system can, however, not detect
which safety door is open or on which switch a fault has occurred.
The switches can be reset via the RST input. To do this, a voltage of 24 V is applied
to the RST input for at least 3 seconds. The supply voltage to the switches is inter-
rupted during this time. The RST input must be connected to 0 V if it is not used.
Figure 5: Connection example for series connection of several ESL-AR devices
GND
DC 24 V
Stift/
connector
(male)
1
2
3
4
5
1
ESL-AR #n
1
2
2
3
3
4
4
Y-Verteiler/Y-distributor
M12 plug-connector
(8-pin)
5
5
6
6
7
Buchse/
connector
(female)
7
8
8
1
2
3
4
5
Stift/
connector
(male)
1
2
3
4
5
1
ESL-AR #n-1
1
2
2
3
3
4
4
Y-Verteiler/Y-distributor
M12 plug-connector
(8-pin)
5
5
6
6
7
Buchse/
connector
(female)
7
8
8
1
2
3
4
5
Stift/
connector
(male)
1
2
3
4
5
1
ESL-AR #1
1
2
2
3
3
4
4
Y-Verteiler/Y-distributor
M12 plug-connector
(8-pin)
5
5
6
6
7
Buchse/
connector
(female)
7
8
8
1
2
3
4
5
1
2
3
4
5
Stift/
connector
(male)
Kurzschlussstecker/
Short-circuit plug
FI1B
UB
FO1A
FO1B
OD
FI1A
0V
RST
FI1B
UB
FO1A
FO1B
OD
FI1A
0V
RST
Connected
load
FI1B
UB
FO1A
FO1B
OD
FI1A
0V
RST