Transient
Protection
2.5kV surge withstand capability as per ANSI/IEEE
C37.90.1-1989
Isolation
Common ground return connected to Chassis Ground.
14.10 Digital Inputs/Outputs
I/O points
8 points
Each point is an input and an output
Output Rating
1.0A maximum
0.35V maximum drop at 1.0A
0.05V maximum drop at 0.1A
Open drain sinking when ON.
28V maximum when OFF.
Input Rating
Dry contact input.
Wetting current typically 5mA, pulsed.
Contact closure to ground is ON.
Open input is OFF.
Digital Input
Thresholds
0.9V typical turn on input voltage.
Less than 0.4V guaranteed turn on input voltage.
1.5V typical turn off input voltage.
Greater than 2.2V guaranteed turn off input voltage.
Contact
Resistance
ON input requires less than 100Ω contact resistance.
OFF input requires greater than 50kΩ contact resistance.
Cable contact capacitance not to exceed 0.033uF,
typically 1600ft (500m).
Transient
Protection
2.5kV surge withstand capability as per ANSI/IEEE
C37.90.1-1989
Isolation
Common ground return connected to Chassis Ground.
SCADAPack LP Hardware Manual
May 26, 2006
45
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