8
Rockwell Automation Publication 1794-IN049E-EN-P - May 2022
FLEX I/O 2-input Frequency Modules Installation Instructions
Interpret Status Indicators
When an input indicator (yellow) is lighted, it indicates that a valid signal (active high or active low) is present at one of the Input terminals.
When wire-off detection is enabled, and a wire-off fault is detected (24V DC IEC 1+ input terminal only), a fault indicator (red) is blinked/flashed at a rate of 1 Hz to signal a fault
condition. A wire-off fault signal is sent to the backplane. A flashing red fault indication means a valid wire-off condition for a 24V DC IEC 1+ Input or a 24V DC contact switch input
with a shunt resistor.
When an output indicator is yellow, the logic is driving an output alarm On. After detecting a fault, the internal circuitry will set the output data to the appropriate safe state, as
defined by the module data table. Safe state control may be adapter-dependent. The input and output indicators are on the field side of the isolation path, and display the logic state
of the actual micro controller input and output.
The status indicator initially powers up as solid green, indicating the power supply is operating and internal diagnostic tests are being performed. After a successful power-up test,
the indicator remains green. The indicator turns red in about 1.5 s if there is an internal diagnostics error. The module is operating correctly when the green OK indicator is on.
A red OK indicator shows that the module is in a Faulted condition (internal error).
Table 3 - Output Map
Dec.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Oct.
17
16
15
14
13
12
11
10
7
6
5
4
3
2
1
0
0
CF
SSM
FR CH 0 Number of pulses to
terminate sampling 0…7 CH 0 MPM 0…3 CH 0
R
LF
FR CH 1 Number of pulses to terminate
sampling 0…7 CH 1
MPM 0…3
CH 1
1
Maximum Frequency 0…32.767 or 0.0…3,276.7 or Absolute Value of Acceleration - 0…32767 Channel 0
2
Frequency Scaling Divisor 0…255 Channel 0
Frequency Scaling Multiplier 0…255 Channel 0
3
WOFG CH 0 WOFF CH 0 IGI CH 0 IFI CH 0 Minimum Frequency Sample Time 0…15
CH 0
Init St Up
CH 0
ACT 0…3
CH 0
F/AAS CH 0 MPDM 0…3 CH 0 WOFM 0…3 CH 0
4
Maximum Frequency 0…32,767 or 0.0…3,276.7 or Absolute Value of Acceleration - 0…32,767 Channel 1
5
Frequency Scaling Divisor 0…255 Channel 1
Frequency Scaling Multiplier 0…255 Channel 1
6
WOFG CH 1 WOFF CH 1 IGI CH 1
IFI CH 1 Minimum Frequency Sample Time 0…15
CH 1
Init St Up
CH 1
ACT 0…3
CH 1
F/AAS CH 1 MPDM 0…3 CH 1
WOFM 0…3 CH 1
7
Reserved
Where: CF = Communication Fault
SSM = Safe state mode
FR = Frequency range
MPM = Missing pulse multiplier
LF = Local Fault mode
F/AAS = Frequency/Accel alarm select
WOFF = Wire-off fault frequency
WOFG = Wire-off fault gate
WOFM = Wire-off fault mode
IGI = Invert gate input
IFI = Invert frequency input
ACT = Acceleration calculation time
MPDM = Missing pulse delay multiplier
R = Reserved
1794-IJ2 shown
A = Input indicator
B = Insertable label for writing individual I/O assignments
C = Wire-off Fault indicator
D = Output indicator
E = Power/status indicator – indicates power applied to module and status of module
FREQ
GATE
OK
0
FREQUENCY INPUT 2 CHANNEL
1
1794-IJ2
Allen-Bradley
E
B
F
0
F
FREQ
GATE
1
F
1
F
OUT
0
OUT
1
C
D
A
