Siemens SIMATIC Distributed I/O System DP/ASi Link Spécifications télécharger pdf (Page 93)

AS-Interface Slaves

I/O modules for operation in the field

Digital I/O modules IP67 - K20

6/93

Siemens IK PI · 2009

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Design (continued)

Please note the following boundary conditions:

• The configuration guidelines for AS-Interface apply. For all

M12 connecting cables the maximum permissible current is

limited to 4 A. The cross-section of these cables amounts to

just 0.34 mm². For connection of the K20 modules, the afore-

mentioned M12 connecting cables can be used for the spur

lines. The voltage drop caused by the ohmic resistance

(approx. 0.11 Ω/m) must be taken into account.

• For round cable connections with shared AS-i and U

aux

in a

single cable, the following maximum lengths apply:

- per spur line from feeder to module: maximum 5 m

- total of all round cable segments in an AS-Interface network:

maximum 20 m

Connection examples for K20 modules

≤ 5 m

≤ 1,5 m

NSA0_00451a

Connection using

4-fold M12 feeder

(3RK1 901-1NR00)

(AS-i/U

aux

)

for I/O modules

Connection using

M12 feeder

(3RK1 901-1NR2.)

(AS-i/U

aux

)

for I/O modules

Connection using

M12 feeder

(3RK1 901-1NR1.)

(AS-i without U

aux

)

for modules with inputs

Further distribution

using MT-12 T feeder

(3RK1 901-1TR00)

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