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IP 240 Preface

Preface

In addition to open and closed-loop control, the programmable controllers of the SIMATIC S5 fa-

mily execute special tasks such as positioning and counting. So that these auxiliary functions do

not unnecessarily load the central processor (S5 CPU), they are handled by standalone "intelli-

gent" I/O modules. These have their own microprocessors and execute special time-critical tasks

autonomously.

The two-channel IP 240 module is suitable for the following applications:

• Position decoding

The IP 240 counts and processes pulses from incremental encoders. Cam controllers and limit

switches can be simulated by comparing the actual value with preset tracks.

• Counting

The IP 240 is suitable for gate-controlled counting of rapid pulse trains and for initiating

specific reactions when the count reaches zero.

• IP 252 expansion

The IP 240 operates as a slave for the IP 252 closed-loop control module, thus allowing the

connection of other incremental encoders to the IP 252. The acquired signals are transferred

direct to the IP 252.

• Positioning

The IP 240 enables controlled positioning with cutoff points. As many as 254 positions can be

stored on the IP for this purpose. When a position has been selected, either the direction of

travel or the traversing speed can be specified directly over the IP outputs. The approach is

controlled and monitored via three selectable operating distance ranges. Incremental enco-

ders are used for position sensing.

The module can intervene direct in the process or flag process states over four digital outputs

(two per channel).

The IP 240 has interrupt capability, making it possible to report certain events direct to the S5 CPU.

Standard software function blocks are available for handling the data interchange between the

S5 CPU and the IP 240.

EWA 4NEB 811 6120-02a

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