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Positioning IP 240

10.5.2 The IP Outputs Control the Traversing Speed

When you configure DAV=0 or DAV=1, you pass control of the traversing speed to the IP

outputs. The outputs are switched without regard to the direction of travel.

a) Outputs are set separately (DAV=0)

After the target position has been selected ( Fig. 10-12a: Actual value 1000), the IP 240 sets

output D1 in dependence on the actual value. When range BEE1 is entered (actual

value 2000), output D1 is reset and output D2 set. When range BEE2 is reached (actual

value 3000), output D2 is reset.

b) Outputs are set collectively (DAV=1)

When the target position has been selected ( Fig. 10-12b: Actual value 1000), the IP 240 sets

inputs D1 and D2 in dependence on the actual value. Output D1 is reset when range BEE1

(actual value 2000) is entered, output D2 when range BEE2 (actual value 3000) is entered.

Fig. 10-12a. Switching Performance of the

IP Outputs when DAV=0

Output

Sample

actual

value

Position

valid

Output

BEE1

Positive direction of travel

BEE2 BEE1

Positive direction of travel

BEE2

320020001000 3200200010003000 3000

Selection of

the target

position

Switching

points for the

target position

Position

value for the

target position

Selection of

the target

position

Switching

points for the

target position

Position

value for the

target position

Fig. 10-12b. Switching Performance of the

IP Outputs when DAV=1

To define the direction of travel, you can scan status bit RICH (direction) on the IP 240 on a one-

shot basis after selecting the position and use it to control two additional PLC digital outputs via

the S5 CPU.

10.5.3 The IP Outputs Control the Direction of Travel

When you choose this option, the IP outputs are allocated to the direction of travel.

When the target position is selected, the IP 240 computes the direction of travel from the actual

value and the position value for the target position and sets one of the IP outputs.

Output D1 is set if positive travel (ascending actual value) is required ( Fig. 10-13a: Actual

value 1000).

Output D2 is set if negative travel (descending actual value) is required ( Fig. 10-13b: Actual

value 6000).

The output that was set is reset when range BEE2 is entered (Fig. 10-13a: Actual value 3000,

Fig. 10-13b: Actual value 4000).

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EWA 4NEB 811 6120-02a

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Siemens IP-Module Especificaciones Pagina 184

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