Euchner CES-AR-CL2-CH (Multicode) Instrukcja Użytkownika Pobierz pdf (Strona 13)

Operating Instructions Safety Switches CES-AR-C.2-CH

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) (conduc-

tor cross-section 0.34 mm²). Cables with a length of 20 m each are connected 

between the individual CES-AR safety switches. 

Fig. 1: Circuit example with six CES-AR

A safety relay is connected downstream which 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). 

Here: 6 switches.

2.  In column I

out

 (possible output current per channel OA/OB), ﬁnd a current 

greater than or equal to 75 mA. Here: 100 mA.

 ¨ It is then possible to determine the maximum cable length from the last switch 

(#6) to the control system from column l

. Here: a length of 50 m is permissible 

with a conductor cross-section of 0.34 mm². 

Result: The desired cable length l

 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.

CES-AR # 6

Sicherheits-

relais

Safety Relay

CES-AR # 5 CES-AR # 4 CES-AR # 3

CES-AR # 2 CES-AR # 1

STATE

DIA

STATE

DIA

STATE

DIA

STATE

DIA

STATE

DIA

STATE

DIA

= 40 m

= 5 x 20 m

max

= 140 m

= 20 m

= min. 19,2 V

out

= min. 75 mA

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 33 34

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