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12.2.2. Determining cable lengths using the example table
Example: 6 switches 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 switch (#6). Cables with a length of 20 m each are connected between the individual safety switches.
u
= min. 19,2 V
n
CES-I-BR # 1
CES-I-BR # 2
Fig. 8:
Circuit example with six CES-C07/CTP/CTA-BR-...-SAB
A safety relay is connected downstream that consumes 75 mA at each of the two safety inputs. This operates over the
whole temperature range with a voltage of 19.2 V (corresponds to 24 V -20%).
All the relevant values can now be determined using the example table:
1. Select the corresponding section in the column n (max. number of switches). In this case: 6 switches.
2. In the column I
FO1A/FO1B
In this case: 100 mA.
It is then possible to determine the maximum cable length from the last switch (#6) to the control system from column
¨
l
. In this case, a length of 50 m is permitted.
1
Result: The desired cable length l
chain l
of 140 m is less than the maximum value of 200 m.
max
The planned application is therefore functional in this form.
¨
MAN20001654-01-03/23 (translation of the original operating instructions)
Transponder-Coded Safety Switch CTP/CTA-L1/2-BR
l
= 5 x 20 m
2
CES-I-BR # 3
CTP/CTA-BR-...-SAB # 4
(possible output current per channel FO1A/FO1B), find a current greater than or equal to 75 mA.
of 40 m is below the permitted value from the table. The overall length of the switch
1
l = 140 m
l
= 20 m
n
CES-I-BR # 5
CTP/CTA-BR-...-SAB # 6
Operating Instructions
l
= 40 m
1
Sicherheits-
relais
I
= 75 mA
FO1A/FO1B
Safety Relay
29
EN
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