Limit Switch Configuration; Base Value For Frequencies (Bv); Start/Stop Rate - Siemens SIMATIC S5 Manual

IP 267
2.2.1

Limit Switch Configuration

The IP 267 can monitor the end points of the traversing range and interrupt
traverse movements if the permissible range is exceeded. You must connect limit
switches to the digital inputs I+ and I - for this purpose. You can use both NC and
NO switches here. You can determine the desired signal behaviour with the limit
switch configuration ("0" active for NCs or "1" active for NOs.). See Chapter 4.1.3
for further details on this point .
2.2.2

Base Value for Frequencies (BV)

You can select frequency ranges by setting a base value for the start/stop rate
and for the stepping rate f
for f ) gives the start/stop rate: if you multiply BV with V (multiplier for f
ss
get the stepping rate f
determined by the frequency range set ( Table 4-4.).
Frequency range: 0.4 Hz to 204 kHz
Relevant pulse duration: 255 µs to 1 µs
2.2.3

Start/Stop Rate

Stepper motors can be driven by the IP 267 from standstill with the start/stop rate
f without losing steps or coming to a standstill. The value for f
ss
specially for each plant ( 6.6.3). During the deceleration phase, the frequency is
continuously reduced from the stepping rate f
IP 267 cannot generate
( Figure 2-1.).
You can set a value between 1 and 255 with bits SS 0 to SS 7. If you multiply this
value with the base value (BV) for the stepping rates, you get the start/stop rate.
EWA 4NEB 812 6061-02a
Driving Stepper Motors with the IP 267
. The base value multiplied by the SS value (multiplier
A
( 4.1.5). The duration of the output pulses is
A
A
control pulses lower
must be found
ss
to the start/stop rate f
than the start/stop
) you
2
A
. The
ss
rate
2-3