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| 3/16/2008 3:23 PM | |
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Posts: 6 Rating:
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Hi Fran, If I read the specifications correctly it's 125 ms just to get across the ADC and that's not the only timing related issue. Beside that there's a 250 ms max time to change a step(to see the output value change.) Then there's the sample rate to contend with. If you look in the system block under input filter there's a setting for how many samples you want before you get a response in the program variable. The last time consuming item is the scan time and that's going to be a variable based on your program. Even if you use the EM235 it still looks like 250 us per point, plus the aforementioned delays it's still slow. Obviously, there's some time between the actual change and the result in the program. If you need instantanious readings, the S7-200 is not what I would select. That's a job for a Labview system. If, however, you are just looking for general 3 phase current for calculation, I've used the Entrelec/ABB TCSA series device sucessfully on multiple applications. Thor AttachmentTCSA1A01.pdf (264 Downloads) |
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