Rockwell-automation 1794-IJ2XT FLEX I/O Frequency Input Modules User M Bedienungsanleitung Seite 65

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55 Publication 1794-6.5.11 - September 2011
Appendix
A
Specifications
What This Appendix
Contains
This appendix contains the frequency accuracy and general specifications of
the Frequency Input module (1794-IJ2, 1794-IJ2K, and 1794-IJ2XT).
Input Specifications
Attribute Value
Number of input channels 2
Number of inputs per
channel
2 – Frequency and Gate
(gate used to establish direction)
Input frequency, max 32 kHz
Frequency value, max 32,767 Hz or 3,276.7 Hz (dependent on range)
Input pulse width 20 μs
Resolution and accuracy See table, Resolution and Accuracy
, on page 24
On-state voltage, min 10V (24V IEC+1 proximity, encoder input or switch inputs)
On-state voltage, nom
(selected by terminal base
connections)
50 mV AC, 28V AC peak – Extended magnetic pickup
500 mV AC, 28V AC peak – Magnetic pickup
< 3V – Vortex flowmeter low range
> 6V – Vortex flowmeter high range
24V DC IEC+1 proximity or encoder input
24V DC Contact switch input
On-state voltage, max Limited to isolated 24V DC power supply
On-state current
min
nom
max
2.0 mA
9.0 mA
10.0 mA
Off-state current <1.5mA into 24V DC IEC+ terminal
Off-state voltage, max 5.0V DC on 24V DC IEC+1 terminal
Wire-off detection 0.4 mA for proximity, encoder or contact switch with
50 kΩ shunt resistor
Frequency input impedance >5 KΩ for 50 mV Extended magnetic pickup
>5 KΩ for 500 mV Magnetic pickup
>10 KΩ for 3V Vortex flowmeter low range
>10 KΩ for 6V Vortex flowmeter high range
>2.5 KΩ for 24V DC IEC+1 proximity or encoder input
>2.5 KΩ for 24V DC Contact switch input
Gate input impedance >5 KΩ for 50 mV Extended magnetic pickup
>5 KΩ for 500 mV Magnetic pickup
>2.5 KΩ for 24V DC IEC+1 proximity or encoder input
>2.5 KΩ for 24V DC Contact switch input
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