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IP 240 Encoder Signals

13 Encoder Signals

This section discusses the requirements for the forms and timing of the signals for the IP 240. The

following encoder signals are discussed in this section:

• Incremental encoder signals for position decoding, IP 252 expansion and positioning mode

( Section 13.1).

• The signal at binary input IN for reference point approach and for synchronization with an

external control signal for position decoding and positioning mode ( Section 13.2).

• The signals at counting input CLK and at binary input GT for counting mode ( Section 13.3).

13.1 Signal Forms and Timing Requirements for Incremental Encoders

13.1.1 Signal Forms

In position decoding, IP 252 expansion and positioning mode, the incremental encoders used for

producing position-dependent signals must generate two square-wave pulse trains in quadrature.

If you want to execute a reference point approach in position decoding and positioning mode, at

least one high-active zero mark signal (reference signal) per encoder revolution is also required.

You can connect incremental encoders to the IP 240 which generate

• symmetrical signals A/A, B/B and Z/Z; the IP interface for these encoders conforms as regards

the level to the RS 422A standard.

• asymmetrical signals A*, B* and Z* with a rated encoder voltage of 5 V or 24 V.

To match the IP 240 to the type of encoder and the signal level, you must set coding switches S4,

S5 and S6 ( Section 5.3).

Fig. 13-1. Signal Forms: Symmetrical Encoder Signals A/A, B/B, Z/Z

Asymmetrical Encoder Signals A*, B*, Z*

90°

B/B*

Z/Z*

A/A*

Note

To change the counting direction, you must interchange the connections as

follows:

• for symmetrical encoders, interchange A/A with B/B

• for asymmetrical encoders, interchange A* with B*

EWA 4NEB 811 6120-02a

13-1

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Siemens IP-Module Especificaciones Pagina 329