Specifications

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AS-Interface Slaves

I/O modules for operation in the field

Digital I/O modules IP67 - K20

6/90

Siemens IK PI · 2009

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Overview

Use in tight spaces

The K20 compact module range rounds off the AS-Interface

compact modules with a particularly slim design and a width of

a mere 20 mm. Thanks to its extremely compact dimensions,

these modules are particularly suited for handling machine ap-

plications in the field of production engineering where modules

need to be arranged in the smallest of spaces.

Robotics is yet another application area. Instead of the AS-Inter-

face flat cable, the K20 modules are connected to AS-Interface

over a round cable with M12 cable box.

The AS-Interface bus cable and the 24 V DC auxiliary power

supply are routed in this case in a shared round cable. This

enables extremely compact installation.

The flexibility of the round cable means that it can also be

used on moving machine parts without any problems. The

K20 modules are also ideal for such applications as their non-

encapsulated design makes them particularly light in weight.

In applications with tow chains, many users rely on placing

the AS-Interface bus cable in a round cable. In this case, the

K20 modules support direct connection to the round cable. No

flat to round cable adapter is required.

The K20 compact module range includes standard AS-Interface

modules, as well as an ASIsafe version for the connection of fail-

safe sensors, such as EMERGENCY STOP pushbuttons or pro-

tective door monitoring. All standard AS-Interface K20 modules

support, as far as technically possible, the expanded address

mode (A/B addresses) according to AS-Interface specification

2.1, which enables connection of 62 stations to an AS-Interface

network. The K20 module with four inputs and four outputs works

in expanded address mode according to AS-Interface specifica-

tion 3.0 which, for the first time, supports four outputs with an

A/B slave, thus enabling 248 inputs and 248 outputs in a fully

expanded AS-Interface network.

For particularly space-saving dimensions, the sensors and actu-

ators are connected over M8 plug-in connectors. Alternatively,

M12 connectors with Y assignment can be used.

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Design

Mounting

Mounting the K20 modules: On the front (see left) or on the side

(see right)

The K20 modules are mounted with two screws. No mounting

plate is required. The modules can be mounted either on the

front or the side. This flexibility allows users to place them where

they will be best protected and save the most space, e. g. on

standard mounting rails.

Addressing

Addressing the K20 modules

Addressing the K20 modules is performed using the same

socket as for the bus connection. The module is connected

to the 3RK1 904-2AB01 addressing unit using a standard M12

connecting cable (2- or 3-pole), e. g. 3RX8 000-0GF32-1AB5.

If the older version of the 3RK1 904-2AB00 addressing unit is

used, a special addressing cable (3RK1 901-3RA00) is required

for connecting to the addressing unit. When the addressing

operation is completed, the addressing cable is removed again

and the module connected to the bus cable. Never use a 4-pole

or 5-pole connecting cable for the addressing.

NSA0_00443a

3RK1 904-2AB01

AS-Interface: 1 ... 31 (1A ... 31B)

ASi-

3RX8 000-0GF32-1AA6

3RX8 000-0GF32-1AB0

3RX8 000-0GF32-1AB5

ASi-

ASi+