Delta RMC101 Manual do Utilizador descarregar pdf (Página 255)

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101

Digital I/O 5.1

Communications 5-5

Figure #5: Open Collector Outputs to RMC CPU Inputs

The RMC’s DI/O inputs are not optimized for use with open collector (sinking) outputs. The

difficulty arises from the fact that sinking outputs have a common ground, but the DI/O also needs

a common ground. Therefore, pullup resisters must be used, as shown in the following diagram

(resister values are described below):

Figure #6: Open Collector Outputs to RMC DI/O Inputs

For 24VDC power, R should be a 3.3kW, ½ watt resister. The output must be capable of

switching 7.5mA when closed. When open collector output is open, the DI/O input sees 7V @

5.1mA.

For 5VDC power, R should be a 560W, 1/8 watt resister. The output must be capable of switching

9.0mA when closed. When open collector output is open, the DI/O input sees 3.1V @ 3.4mA.

Dividing the Input Voltage

Because the inputs are designed for use with 5V outputs, the threshold is 2.75VDC. This is a

small percentage of the 24V outputs. As a result, it is important that the inputs have very little

noise. This section describes using a voltage divider to raise the apparent input threshold.

Note: Before resorting to dividing the input voltage, take all possible measures to eliminate noise

from the inputs. Also, you may want to employ the software input filters.

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