Rockwell Automation 1794-IJ2XT FLEX I/O Frequency Input Modules User Manual - Manual (Page 65)

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
μ
s
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 k
Ω
shunt resistor
Frequency input impedance >5 K
Ω
for 50 mV Extended magnetic pickup
>5 K
Ω
for 500 mV Magnetic pickup
>10 K
Ω
for 3V Vortex flowmeter low range
>10 K
Ω
for 6V Vortex flowmeter high range
>2.5 K
Ω
for 24V DC IEC+1 proximity or encoder input
>2.5 K
Ω
for 24V DC Contact switch input
Gate input impedance >5 K
Ω
for 50 mV Extended magnetic pickup
>5 K
Ω
for 500 mV Magnetic pickup
>2.5 K
Ω
for 24V DC IEC+1 proximity or encoder input
>2.5 K
Ω
for 24V DC Contact switch input