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Operating Modes, parameters and commands
7.4 Measuring modes
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01
143
7.4.4
Speed capture
Speed measurement
In the RPM measurement operating mode, the FM 350-1 counts the pulses that are received
from a tacho-generator within a dynamic measuring time, and calculates the speed from this
value with the number of pulses per encoder revolution.
For the RPM measurement mode, you must also set the pulses per encoder revolution.
This returns the speed expressed in units of 1x10
-3
/min.
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8SGDWHWLPH
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Figure 7-33 RPM Measurement with Gate Function
Update Time
The FM 350-1 updates the measured values cyclically. You enable the update time by
means of the "Update time" parameter. You can change the update time during operation.
Table 7- 35 Calculating the Update Time
Value range of n
Boundary conditions
Update time
n
min
n
max
Non-isochronous mode
Any T
DP
n × 10 ms
1
1000
T
DP
< 10 ms
n × T
DP
(10 ms/T
DP
[ms] ) +1
1)
1000
Isochronous mode
T
DP
≥ 10 ms
n × T
DP
1
10000 ms/T
DP
[ms]
1)
1
The decimal places obtained after division by T
DP
are omitted.
It is prohibited to exceed these limits. If these limits are exceeded, the FM 350-1 generates a parameterization error and
does not switch to isochronous mode.
Содержание SIMATIC S7-300 FM 350-1
Страница 8: ...Table of contents FM 350 1 Counter module 8 Manual 05 2011 A5E03648639 01 ...
Страница 168: ...Encoder signals and their evaluation 8 4 Signal evaluation FM 350 1 Counter module 168 Manual 05 2011 A5E03648639 01 ...
Страница 186: ...Technical data 11 2 Technical data FM 350 1 Counter module 186 Manual 05 2011 A5E03648639 01 ...
Страница 188: ...Replacement parts FM 350 1 Counter module 188 Manual 05 2011 A5E03648639 01 ...
Страница 190: ...References FM 350 1 Counter module 190 Manual 05 2011 A5E03648639 01 ...
Страница 194: ...Glossary FM 350 1 Counter module 194 Manual 05 2011 A5E03648639 01 ...