19
MAN20001512-01-03/22 (translation of the original operating instructions)
Operating Instructions
Key Adapter CKS2-K-BP/BR-CC-FLX
EN
10.2.2. Determining cable lengths using the example table
Example: 6 devices are to be used in series. Cabling with a length of 40 m is routed from a safety relay in the control cabinet
to the last device (#6). Cables with a length of 20 m each are connected between the individual devices.
Sicherheits-
relais
Safety Relay
CKS2-K-BR # 6
CES-I-BR # 5
CES-I-BR # 4
CES-I-BR # 3
CES-I-BR # 2
CES-I-BR # 1
l
1
= 40 m
l
2
= 5 x 20 m
l
max
= 140 m
l
n
= 20 m
i
out
= min. 75 mA
Fig. 3:
Circuit example with six devices
A safety relay is connected downstream that consumes 75 mA at each of the two safety inputs.
All the relevant values can now be determined using the example table:
1. Select the corresponding section in the column n (max. number of devices). Here: 6 devices.
2. In column I
FO1A
/I
FO1B
(possible output current per channel FO1A/FO1B), find a current greater than or equal to 75 mA.
In this case: 100 mA.
¨
It is then possible to determine the maximum cable length from the last device (#6) to the control system from the
column l
1
. In this case, a length of 50 m is permitted.
Result: The desired cable length l
1
of 40 m is below the permitted value from the table. The overall length of the switch
chain l
max
of 140 m is less than the maximum value of 200 m.
¨
The planned application is therefore functional in this form.
