16.10 Counter
Inputs
Counter Inputs
Counter 0 Digital Input Counter
Counter 1 Turbine Meter inputs
Counter 2 Turbine Meter inputs
Digital Input Counter 0
Maximum frequency 10Hz.
Dry contact input.
Wetting current typically 5mA.
Contact closure to ground is ON.
Open input is OFF.
Counter 1 and 2
Designed for use with low voltage, turbine meter
outputs.
Jumper link selectable for use with turbine meter
amplifiers or dry contact closure.
Counter 1 and 2
Turbine Meter
Sensitivity
Minimum input 30mVp-p at 5-50Hz.
Minimum input 150mVp-p at 150Hz.
Minimum input 650mVp-p at 5kHz.
Minimum input 750mVp-p at 10kHz.
Maximum input 4Vp-p using internal amplifier.
Counter 1 and 2 Dry
Contact
Maximum input 10Vp-p without internal amplifier.
Maximum frequency 10KHz.
Transient Protection
2.5kV surge withstand capability as per ANSI/IEEE
C37.90.1-1989
Isolation
Common ground return connected to Chassis
Ground.
16.11 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 100
Ω
contact resistance.
OFF input requires greater than 50k
Ω
contact resistance.
Cable contact capacitance not to exceed 0.033uF,
typically 1600ft (500m).
Transient
2.5kV surge withstand capability as per ANSI/IEEE
SCADAPack 350 Hardware Manual
February 14, 2007
61
