B&B Electronics 4 Channel Input Buffer Board SDAIBB Manuale Utente Pagina 20

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16 Chapter 2 Documentation Number UD128A8D4602 Manual
B&B Electronics Mfg Co 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd Westlink Comm. Pk. Oranmore, Galway, Ireland Ph 353-91-792444 Fax 353-91-792445
Common Connections – Example Figures
Digital Input Examples
Digital
Input
DIG
Vref
DIG
GND
UD128A8DExternal Circuit
Switch
LED
2.2K
2.2K
Digital
Input
DIG
Vref
DIG
GND
UD128A8DExternal Circuit
Switch
LED
Fig. 2.3 Fig. 2.4
Active Low with switch closure Active High with switch closure
Note: LEDs may be omitted by increasing 2.2K to 4.7K ohm
Relay
Contact
Digital
Input
DIG
Vref
DIG
GND
UD128A8DExternal Circuit
LED
2.2K
Digital
Input
DIG
Vref
DIG
GND
UD128A8DExternal Circuit
Relay
Contact
2.2K
LED
Fig. 2.5 Fig. 2.6
Active Low with Relay contact closure Active High with Relay closure
4.7K
Digital
Input
DIG
Vref
DIG
GND
UD128A8DExternal Circuit
VDC
4.7K
Digital
Input
DIG
Vref
DIG
GND
UD128A8DExternal Circuit
VDC
Fig. 2.7 Fig. 2.8
Active Low pull-down Isolated AC/DC input Active Low
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