Specifications

Publication 1794-SG002D-EN-P - May 2012
60 Select FLEX I/O Modules
The frequency input module isolated power supply consists of 1 isolated
24V DC power supply that provides 2 current limited outputs of 30 mA
maximum (1 for each channel).
24V DC Input Frequency Module
Specification 1794-IJ2, 1794-IJ2XT
Processing time ≤ 4 ms
Input frequency, max 1…32 kHz w/sine wave
1…32 kHz w/square wave input
Frequency value, max 32,767 or 3,276.7 (dependent on range)
Input pulse width, min 20 μs
Voltage, on-state input, min 10V (24V IEC+1 proximity, encoder input or switch inputs)
Voltage, on-state input, nom 24V DC
Voltage, on-state input, max Limited to isolated 24V DC power supply
Current, on-state input, min 2.0 mA
Current, on-state input, nom 9.0 mA
Current, on-state input, max 10.0 mA
Voltage, off-state input, max 5.0V DC on 24V DC IECI + terminal
Current, off-state input, max 1.5 mA into 24V DC IECI + terminal
Wire-off detection 0.4 mA for proximity, encoder, or contact switch with 50 kW
shunt resistor
Impedance, frequency input >5 kΩ for 50 mV extended magnetic pickup
>5 kΩ for 500 mV magnetic pickup
>10 kΩ for 3V vortex flowmeter
>10 kΩ for 6V vortex flowmeter
>2.5 kΩ for 24V DC IEC1+ proximity or encoder input
>2.5 kΩ for 24V DC contact switch input
Impedance, gate input >5 kΩ for 50 mV extended magnetic pickup
>5 kΩ for 500 mV magnetic pickup
>2.5 kΩ for 24V DC IEC1+ proximity or encoder input
>2.5 kΩ for 24V DC contact switch input
Output voltage source Customer supplied
Voltage, on-state output, min 10V DC
Voltage, on-state output, nom 24V DC
Voltage, on-state output, max 31.2V DC
Current, on-state output, min 1.0 mA per output
Current, on-state output, max 1.0 A per channel sourced out of module
(1)
Output surge current, max 2 A for 50 ms, repeatable every 2 s
Voltage drop, on-state output,
max
0.9V dc @ 1 A
Output control Outputs individually assignable to:
Frequency
% Full Scale
Acceleration alarm
Output switching time Triggered by frequency alarm or acceleration alarm
Turn On: < 0.5 ms
Turn Off: < 1 ms