Measurement-computing PCI-PDISO8 Manual do Utilizador descarregar pdf (Página 10)

Chapter 3

Functional Details

Relay outputs

Form C relay

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, like those connected at relay 0 through relay 4.

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.

Form A relay

The Form A relay has a common and a normally open (NO) contact. Figure 7 shows the schematic for a Form A

relay, like those connected at relay 5 through relay 7.

Figure 7. Form A Relay (5) contacts

 When 0 is written to the output, the common and NO are NOT in contact.

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

The Form A and Form C relays on the PCI-PDISO8 board are the same type. Only the connections to the relay

poles differ.

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