Encoders
10-8
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
Reaction Times
With absolute encoders, the FM 452 has the following reaction times:
Minimum reaction time = frame run time + cam cycle + switching time of the connected switching elements
Maximum reaction time =
2
frame run time + monostable flip-flop time + 2
cam cycle + switching time of the
connected switching elements
With programmable absolute encoders:
Maximum reaction time =
frame run time + monostable flip-flop time + 2
cam cycle + switching time of the
connected switching el1/max. step train sequence
Monostable flip-flop time
The following limit values apply to the monostable flip-flop time:
•
Minimum monostable flip-flop period: > 15
s
•
Maximum monostable flip-flop time: < 64
s
Encoders with values outside the limits shown here are not permitted.
Frame run times
The frame run times depend on the baud rate:
Baud rate
Frame Run Time for 13 bits
Frame Run Time for 25 bits
0.125 MHz
112
s
208
s
0.250 MHz
56
s
104
s
0.500 MHz
28
s
52
s
1.000 MHz
14
s
26
s
Example of Reaction Times
The following example shows how to calculate the minimum and maximum
reaction time. In the example a programmable encoder is not used.
•
Cam cycle: approx. 20
µ
s for max. 16 cams
•
Switching time of the hardware: approx. 150
µ
s
•
Frame run time: 26
µ
s at 1 MHz baud rate (25-bit frame)
•
Monostable flip-flop period: 20
µ
s (depends on the encoder: typical 20 to 40
µ
s)
Minimum reaction time = 26
µ
s + 20
µ
s + 150
µ
s = 196
µ
s
Maximum reaction time = 2
26
µ
s + 20
µ
s + 2
20
µ
s + 150
µ
s = 262
µ
s
Содержание SIMATIC FM 452
Страница 8: ...Contents viii FM 452 Electronic Cam Controller C79000 G7076 C452 04 ...
Страница 14: ...Product Overview 1 6 FM 452 Electronic Cam Controller C79000 G7076 C452 04 ...
Страница 28: ...Installing and Removing the FM 452 3 2 FM 452 Electronic Cam Controller C79000 G7076 C452 04 ...
Страница 36: ...Wiring the FM 452 Electronic Cam Controller 4 8 FM 452 Electronic Cam Controller C79000 G7076 C452 04 ...
Страница 38: ...Installing the Software 5 2 FM 452 Electronic Cam Controller C79000 G7076 C452 04 ...
Страница 62: ...Programming the FM 452 6 24 FM 452 Electronic Cam Controller C79000 G7076 C452 04 ...
Страница 68: ...Putting the FM 452 into Operation 7 6 FM 452 Electronic Cam Controller C79000 G7076 C452 04 ...
Страница 130: ...Settings 9 32 FM 452 Electronic Cam Controller C79000 G7076 C452 04 ...
Страница 140: ...Encoders 10 10 FM 452 Electronic Cam Controller C79000 G7076 C452 04 ...
Страница 146: ...Diagnostics 11 6 FM 452 Electronic Cam Controller C79000 G7076 C452 04 ...
Страница 162: ...Samples 12 16 FM 452 Electronic Cam Controller C79000 G7076 C452 04 ...
Страница 168: ...Technical Specifications A 6 FM 452 Electronic Cam Controller C79000 G7076 C452 04 ...
Страница 174: ...Connection Diagrams B 6 FM 452 Electronic Cam Controller C79000 G7076 C452 04 ...
Страница 200: ...Data Blocks Error Lists C 26 FM 452 Electronic Cam Controller C79000 G7076 C452 04 ...