Measurement-computing E-PDISO16 Uživatelský manuál stáhnout pdf (Strana 18)

E-PDISO16 User's Guide Functional Details

Digital input terminals (IP0A to IP15B)

The E-PDISO16 has 16 isolated digital inputs. Connect up to 16 isolated differential digital input signals using

the following screw terminal pairs:

! IP0A and IP0B ! IP8A and IP8B

! IP1A and IP1B ! IP9A and IP9B

! IP2A and IP2B ! IP10A and IP10B

! IP3A and IP3B ! IP11A and IP11B

! IP4A and IP4B ! IP12A and IP12B

! IP5A and IP5B ! IP13A and IP13B

! IP6A and IP6B ! IP14A and IP14B

! IP7A and IP7B ! IP15A and IP15B

A schematic of a single channel is shown in . The signals are routed through a bridge rectifier so that

the inputs are not polarity-sensitive. It can be driven by either AC (50 - 1000 Hz) or DC voltage up to ±30

VDC.

Figure 3-4

Figure 3-4. Single-channel configuration

1.6 K

Isolated Input

Not Polarized Circuitry Sharing

PC Ground

Filter Switch

0.1uF

47K

+5V

100K

The 16 optically-isolated (500 V) inputs can be read back as a single byte. Each input has a software-controlled

filter with a time constant of 5 ms (200 Hz). The filter is required for AC inputs, and recommended for almost

all DC inputs. Unless you have a good reason to turn off a filter, we recommend that you enable it.

Extending the input range

To extend the input range beyond the 5 to 30 V specified, add an external resistor. shows the external

resistor (R

ext

) and the equations used to calculate resistor values for a given V

. The equation R

ext

= 100 * (V

–

30) calculates the resistor value for a given V

Figure 3-5

Figure 3-5. External resistor added to extend input range

Make sure the external resistor is capable of handling the power generated by the input. Calculate the power

requirement in watts (P

) using the equation P

= R

ext

/10000.

1.6 K

Isolated Input

Not Polarized

R ext

R ext = 100 * (Vin - 30)

Pw = R ext / 10

V in

3-5

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 27 28

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