Technical data
Publication 1794-2.1 - January 2000
FLEX I/O and FLEX Integra Product Data
24V dc 2 Input Frequency Module Cat. No. 1794-IJ2 137
Channel 0 Terminals
5
Channel 1 Terminals
5
Type of
Inputs
Power Input
RET
6
Power Input
RET
6
GND
5
Frequency
24V dc
IEC1+
Proximity
1
,2
A-7 A-6 A-3 A-8 A-9 A-12
24V dc
Contact
Switch
3
A-7 A-6 A-3 A-8 A-9 A-12
500mV ac
Magnetic
Pickup
A-7 A-5 A-3 A-8 A-10 A-12
50mV ac
Magnetic
Pickup
4
A-7 A-5 A-3 A-8 A-10 A-12
6V ac
Vortex
A-2 A-1 A-3 A-13 A-14 A-12
3V ac
Vortex
A-2 A-0 A-3 A-13 A-15 A-12
1
As defined by standard IEC 1131-2.
2
RET not used on 2-wire devices.
3
Add external resistor from 24V to F or G for wire-off detection (0.4mA).
4
Add a jumper between 50mV and RET (Frequency - channel 0=4 to 3; channel 1=11 to
12). (Gate - channel 0=21 to 20; channel 1=28 to 29).
5
Connect cable shields to GND terminals.
6
All 4 RET terminals (ch 0 and 1, Freq, Gate) are internally connected together.
Channel 0 Terminals
5
Channel 1 Terminals
5
Type of
Inputs
Power Input
RET
6
Power Input
RET
6
GND
5
Gate
24V dc
IEC1+
Proximity
1
,2
B-24 B-23 B-20 B-25 B-26 B-29
24V dc
Contact
Switch
3
B-24 B-23 B-20 B-25 B-26 B-29
500mV ac
Magnetic
Pickup
B-24 B-22 B-20 B-25 B-27 B-29
50mV ac
Magnetic
Pickup
4
B-24 B-22 B-20 B-25 B-27 B-29
1
As defined by standard IEC 1131-2.
2
RET not used on 2-wire devices.
3
Add external resistor from 24V to F or G for wire-off detection (0.4mA).
4
Add a jumper between 50mV and RET (Frequency - channel 0=4 to 3; channel 1=11 to
12). (Gate - channel 0=21 to 20; channel 1=28 to 29).
5
Connect cable shields to GND terminals.
6
All 4 RET terminals (ch 0 and 1, Freq, Gate) are internally connected together.
Channel 0 Terminals
1
Channel 1 Terminals
1
Output Alarm
Connections
Sply
+
Sply
RET
Out
+
Out
RET
Sply
+
Sply
RET
Out
+
Out
RET
Supply Connection C-37 C-39 C-46 C-48
Output Connection B-17 B-18 B-31 B-32
1
Connect cable shields to GND connections.
Specifications - 1794-IJ2
Module Location Cat. No. 1794-TB3G or -TB3GS Terminal Base Unit
Isolation Voltage 1250 Vrms/V ac between user input (F & G) and
system, user output (0 & 1) and system, and user
power and system
100% tested at 2121V dc for 1s
500 Vrms/V ac between 4 user inputs and 2 user
outputs, user output 0 and output 1
100% tested at 850V dc for 1s
Processing Time ≤4ms
Flexbus Current 30mA @ 5V dc
Power Dissipation 4.6W maximum @ 31.2V dc
Thermal Dissipation Maximum 15.6 BTU/hr @ 31.2V dc
Indicators (Field-Side Driven,
Logic-Side Indication)
1 green/red power/status indicator
Input:
4 yellow status indicators (0, 1) - logic side
4 red wire-off indicators (F) - logic side
Output:
2 yellow status indicators (0, 1) - logic side
Keyswitch Position 1
Input Specifications
Number of Input Channels 2
Number of Inputs
perChannel
2 - Frequency and Gate (gate used to establish
direction)
Input Frequency (max) 1-32Kz w/sine wave; 1-32KHz w/square wave
input
Frequency Value (max) 32,767 or 3,276.7 (dependent on range)
Input Pulse Width (min) 20µs
Resolution/Accuracy Refer to resolution/accuracy table
On-State Voltage (min) 10V (24V IEC+1 proximity, encoder input or switch
inputs)
On-State Voltage (nominal)
(selected by terminal base
connections)
50mV ac, 28V ac peak - Extended Magnetic Pickup
500mV ac, 28V ac peak - Magnetic Pickup
≤3V - vortex flowmeter low range
≥6V - vortex flowmeter high range
24V dc IEC1+ proximity or encoder input
24V dc contact switch input
On-State Voltage (max) Limited to isolated 24V dc power supply
On-State Current
Minimum
Nominal
Maximum
2.0mA
9.0mA
10.0mA
Off-State Voltage (max) 5.0V dc on 24V dc IEC1+ Terminal
Off-State Current (min) 1.5mA into 24V dc IEC1+ Terminal
Wire-Off Detection 0.4mA for proximity, encoder, or contact switch
with 50kΩ shunt resistor