Cameron Scanner 3100 EFM - Digital Inputs-Contact Closure

Digital Inputs—Contact Closure
The digital contact closure input (Figure 3.9, top) provides an input for use with any relay contact switch. DIO 1 through
DIO 4 are optically isolated. DIO 5 and DIO 6 (Figure 3.9, bottom) are non-isolated. To congure a contact closure using
the Scanner 3100 web interface, choose Contact Closure as the input type and select a trigger state to indicate whether
the pulse will trigger when the signal is high or when it is low.
Note Digital input/output common (COM) connections are not interchangeable. The COM connection located between
DIO 3 and DIO 4 terminals cannot be used with DIO 5 and DIO 6 wiring and vice versa. The COM connections
between DIO 3 and DIO 4 terminals contains a 3.6 kΩ resistor to circuit ground. The COM connection between
DIO 3 and DIO 4 terminals can be used with DIOs 1 through 4.
DIO 3 DIO 4
COM
COM (-)
Signal (+)
Relay
Contact
DIO 1, 2
DIO 3 DIO 4
COM
COM (-)
Signal (+)
Relay
Contact
Optically-isolated digital input
DIO 5, 6
COM (-)
Signal (+)
COM
Relay
Contact
Non-isolated digital input for use with internal pull-up resistor
Figure 3.9—Digital contact closure
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Scanner 3100 EFM Section 3