Siemens IP-Module Handbuch PDF herunterladen (Seite 104)

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101

Machine Data, Modes and Traversing Programs IP 266

Example B: The drive is positioned to the reference point switch

Figure 5-15. Reference Point Approach in Example B

R: Reference point

for

rev

Encoder's zero mark

Forward

REF

This represents a special feature of the "Approach reference point" mode.

Start the reference point approach with "Start". The drive then executes the

following movements:

1. The IP 266 accelerates the drive immediately in the specified direction until it

reaches reference speed 2.

2. A change from 1 to 0 in the signal from the reference point switch sets an

internal Enable signal. When this signal is set, the IP 266 waits for the next zero

mark pulse from the encoder. A change of the zero mark signal from 0 to 1 sets

the reference point. The reference point coordinate specified in the machine

data is assigned to this position. At the same time, the IP 266 decelerates the

drive to zero speed. The actual value is acquired and displayed. When the drive

is at zero speed, the actual value is lower (i. e. more negative) than the

reference point coordinate.

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EWA 4NEB 812 6057-02

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