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Topics - Fernandz

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Technical support / Example #8 in Part two
« on: March 02, 2003, 01:48:08 PM »
In part two example #8 the H.V.A.C application you show two formulas to convert ADC input to temp. S=ADC(5)*(300-160)/4096*160 and T=ADC(1)*(500+100)/4096-100. What is the reason for subtracting the temp range in the first formula and then adding the 160, and on the second formula adding the range and subtracting 100?
   My second question is im using a thermister (3,000Ohms @77 deg.F) connected to a simple voltage divider circuit. I would like to convert the 0 to 5 volt analog signal to a temperture ( 0 volts would be about 100 deg.f @ around 1900 Ohms and 5 volts would be about 60 deg. F @ around 4600 Ohms)

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Technical support / Temperature Transmitters
« on: January 20, 2003, 03:58:46 PM »
I'm interested in useing the T100MD888+ in a building automation roll for H.V.A.C equipment. I'm a little green still when it comes to PLC's. I've noticed that some manufactures of building automation controls use 2 wire thermistors (NTC) connected straight to there analog inputs with no exterior signal conditioning can this be done with the T100MD888+ with its 5V analog output? If so where would i get this info.??

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Technical support / Using VB6 to interrorgate Analog inputs
« on: September 04, 2003, 04:16:28 PM »
Is there a list of commands that can be used to return the values of the Analog inputs of the M-series PLC? I would like to use the MScomm control to link to the serial port.

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Technical support / LM335 IC sensor
« on: October 30, 2003, 02:41:03 PM »
What would be the best way to hook up a LM335 sensor to the analog inputs of the T100MD? Also what formula would i have to use?

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