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IP 266 Machine Data, Modes and Traversing Programs

Example C: The drive is behind the reference point switch.

Figure 5-16. Reference Point Approach in Example C

for

rev

R: Reference point

Encoder's zero mark

Forward

REF

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

following movements:

1. First, the IP 266 accelerates the axis in a forward direction at the specified

acceleration rate. The drive is thus accelerated toward the hardware end limit

switch.

2. When it has reached reference speed 1, the drive moves at constant speed.

3. When the limit switch is reached, the IP 266 decelerates the drive at the

specified deceleration rate.

4. When the drive reaches zero speed, the IP 266 switches it into reverse, again

accelerating it until it reaches reference speed 1.

5. When the edge of the signal from the reference point switch goes from 0 to 1,

the IP 266 decelerates the drive to reference speed 2.

6. An edge change from 1 to 0 in the signal from the reference point switch sets

an internal Enable signal. When this signal is set (the drive is moving at

reference speed 2), the IP 266 waits for the next zero mark pulse from the

encoder. A change from 0 to 1 in the zero mark signal 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.

EWA 4NEB 812 6057-02

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Siemens IP-Module Manual Pagina 105