Callisto

MrPLC Member
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About Callisto

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  • Country Singapore
  1. SFB 47 for counting pulses

    Thanks jesper will have a look and try it out cheers
  2. SFB 47 for counting pulses

    Hi guys, I have a incrementral encoder that that churns out 360 pulses per revolution. I would like to use the integrated function of the S7-300 CPU314C-2 DP to count the pulses I have set the operating mode to count once and i am using channel 3 for the signal of the encdoer. Here are the settings for the basic parameters Main count direction : up Gate function : cancel count Comparison value : 0 Hysteresis : 0 Input evaluation : Pulse /direction Comparison : none interrupt : none There was a job error which states i was on the wrong operating mode or had faulty parameters when i got the program running. Can anybody give advice about the parameters that i should set or the operating mode which i should be operating on? Cheers
  3. Pulse Counting

    Hi Berg, I was just wondering. The PLC I'm using is the s7300 cpu 314c-2DP. This means that i would have to use the integrated functions from the integrated modules that the CPU has. Should i be using the positioning integrated function to count the pulses or the counter integrated function to count the pulses? One more thing, i need to generate an anlog signal of 0 - 10 volts from the PLC so that i can control the frequency converter. Do i need to supply an external analog voltage signal to the input of the PLC in order to produce the analog voltage at the output of the PLC? Regards Callisto
  4. Pulse Counting

    Hi Berg and Bapi I made a mistake.I'm actually using s7300 for my PLC. Yes the frequency for the motor is 50 hz, the motor is a 4 pole machine.And my encoder gives me 500 pulses per revolution and is also linked to the shaft without any gear box.And the encoder needs a supply of 5v. But i just found out that my encdoer isnt working at all...becos i tested it by turning the encoder manually while connected to an oscilloscope but there were no pulses. will work on getting another encoder :) I have another question to ask though. I was told that i am able program the siemens PLC to give an analog output of 10v from the analog output module.Can that be done? I need to do that because i basically need to that to supply my VSD for variation of the motor speed. Regards Callisto
  5. Pulse Counting

    Hi, Thanks for the reply guys. Do you mean that the High speed counter is only in micro win and not in step 7? The max frequency of my motor is 50hz but since the i would be varying the speed of my motor with a VSD the max frequecny wouldnt be always at 50hz. The output for my encoder would be pulses. I dont know how many pulses per revolution it gives because the manual for it cant be found. The voltage level of the encoder is +5v im still quite new to PLC and thus im quite lost as well. :) Thank you Regards
  6. Pulse Counting

    Hi guys, I have a speed encoder on my hands right now that needs to be read from. The speed endcoder generates pulses . So how do I use the siemens PLC to count the pulses and give me the actual speed of the motor setup that I have? Can anybody show me a sample program or give me some tips no how I should go about doing it? I'll be using the S7200 PLC. Thank you regards
  7. Help

    Hi guys, Im a student undertaking a little project rite now . I am required to use a PLC to read the values from a motor. I will be using either the S7200 or the S7300. The values would be the torque, speed and power of the motor. The speed of the motor will be from a speed encoder and the torque will be from a torque transducer. As for the power i would need to take the product of the speed and torque. Can any of u guys give me some tips on how i would be able to connect the PLC to the motor? And how the program for the PLC would be like ? As im still new to PLC. Thank you Regards