| ??? 05/30/07 07:26 Read: times |
#140027 - Yes other interrupt are also there Responding to: ???'s previous message |
Sorry I have been out of city.that why couldn't reply
900 pulses per min = 15 pulses per second. Most processors will have no problem polling 12 inputs of this speed. If you consider a lowly 12 clocker 8051 will execute 1million instructions per second - you can see 15 counts per second * 12 leaves us 5555 instruction times. Apart from counting pulses, what else will it do? 1) Yes Russell, besides counting pulse, all 12 input also have 4 bit status, One bit among these 4 bits is machine Run attempt signal(when machine is running this bit will high), other 3-bits in status bits tell us about faults.WE ALSO HAVE TO COUNT THESE FAULT TOO.But these fault will only rise when Run signal goes down. I made bus using HC245 chips, I am taking "Run signal" to generate Hardware interrupt and using both Interrupt. 2)Serial interrupt is also there, which may may come after 5 seconds and and i have to send as many as 120 byte at 4800 bauds. 900 pulses is maximum capacity of machine,generating 12 pulses usually for many reason operator cann't it more than 700 RPM.(Each revolution generate one pulse) A. Moizi |
| Topic | Author | Date |
| 12 parallel pulses counting | 01/01/70 00:00 | |
| How fast are these pulses? | 01/01/70 00:00 | |
| pulses speed | 01/01/70 00:00 | |
| More info | 01/01/70 00:00 | |
| Pulse rate | 01/01/70 00:00 | |
| Isn't it slightly more complicated? | 01/01/70 00:00 | |
| Stretching pulses | 01/01/70 00:00 | |
| Another Quick Way | 01/01/70 00:00 | |
| Sampling timer with a buffer | 01/01/70 00:00 | |
| Showing Vertical Couners | 01/01/70 00:00 | |
| Yes other interrupt are also there | 01/01/70 00:00 | |
| Avoid using interrupts where possible | 01/01/70 00:00 | |
| Run signals frequency... | 01/01/70 00:00 | |
| PLC can be dirt cheap | 01/01/70 00:00 | |
| PLCs | 01/01/70 00:00 | |
an xcellent idea | 01/01/70 00:00 | |
| Sample with 2 74LS165 parallel loadShiftRegisiters | 01/01/70 00:00 | |
| would not the output pins drop... | 01/01/70 00:00 | |
| No Extra Hardware Needed | 01/01/70 00:00 | |
| No Extra Hardware Needed - I do not agree | 01/01/70 00:00 |