Measurement-computing CIO-PDISO16 Manual do Utilizador descarregar pdf (Página 14)

Chapter 3

Functional Details

Form C relay outputs

The Form C relay has a common, normally open (NO) and normally closed (NC) contact. Figure 6 shows the

schematic for a Form C relay.

NORMALLY OPEN

COMMON

NORMALLY CLOSED

Figure 6. Form C Relay (0) contacts

 When 0 is written to the output, the common and NC are in contact.

 When 1 is written to the output, the common and NO are in contact.

Isolated inputs

The CIO-PDISO16 has sixteen isolated input channels. A schematic of a single channel is shown in Figure 7.

1.6 K

Isolated input

not polarized Circuitry sharing

PC Ground

Filter switch

0.1 uF

47 K

+5 V

100 K

Figure 7. Isolated input schematic – simplified

The signals are routed through a bridge rectifier so that the inputs are not polarity sensitive. When a voltage is

present at the input than the "input high" threshold, a logical "1" will be sensed for that input.

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Measurement-computing CIO-PDISO16 Manual do Utilizador Página 14