Configuration Data For The Paths A To B And B To C - Siemens SIMATIC S5 Manual

IP 267
6.6.4

Configuration Data for the Paths A to B and B to C

Limit switch configuration remains at "1" active, the motor continues to run in
full-step mode and "STOP" mode instructs the IP 267 to transfer the data. Byte 1
of the new configuration message frame is transferred unchanged to output byte
QB 89 of the PIQ ( Table 6-3.).
The following applies for this example: QB 89 =
The stepping rate f on the paths A to B and B to C is to be halved to 5 kHz in
A
order to reduce the velocity of the loaded waggon. The new stepping rate is
reached by halving the base value for the frequency (BV) from 40 to 20 Hz.
The new value for BV is written into output byte QB 91 of the PIQ as byte 3 of the
new configuration message frame. ( Table 6-3.).
The following applies for this example: QB 91 =
The start/stop rate f for both paths is to be reduced to a maximum of 90 Hz. This
SS
compensates for the additional moment of inertia of the loads. The new
multiplier for the start/stop rate (SS) is calculated with the following formula:
SS = 4 has been selected in this example. This corresponds to a start/stop rate of
80 Hz.
EWA 4NEB 812 6061-02a
= BV V
f
*
A
5 kHz = BV * 250 *
BV = 20 Hz
f = BV SS *
*
ss
90 Hz = 20 SS *
*
SS = 4.5
Application Examples
0000 0010 =02
R
*
1
0000 0101 =05
R
1
H
H
6
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