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Rockwell Automation Publication 1794-IN049E-EN-P - May 2022
FLEX I/O 2-input Frequency Modules Installation Instructions
Figure 1 - Wiring Connections using 1794-TB3G or 1794-TB3GS Terminal Base Unit
Output Alarm Connections
Channel 0 Terminals
(1)
Channel 1 Terminals
(1)
(1) Connect cable shields to GND connections.
Sply +
Sply RET
Out +
Out RET
Sply +
Sply RET
Out +
Out RET
Supply
C-37
C-39
C-46
C-48
Output
B-17
B-18
B-31
B-32
Types of Inputs
Channel 0 Terminals
(1)
(1) Connect cable shields to GND terminals
Channel 1 Terminals
(1)
Power
Input
RET
(2)
(2) All four RET terminals (ch0 and 1, Freq. and Gate) are internally connected together.
Power
Input
RET
(2)
GND
(1)
Frequency
24V DC IEC 1+ Proximity
(3), (4)
(3) As defined by standard IEC 1131-2.
(4) RET not used on 2-wire devices.
A-7
A-6
A-3
A-8
A-9
A-12
24V DC Contact Switch
(5)
(5) Add external resistor from 24V to F (A-6) or G (A-9) for wire-off detection (0.4 mA).
A-7
A-6
A-3
A-8
A-9
A-12
500 mV AC Magnetic Pickup
A-7
A-5
A-3
A-8
A-10
A-12
50 mV AC Magnetic Pickup
(6)
(6) Add jumper between 50 mV and RET (frequency - channel 0 = A-4…A-3; channel 1 = A-11…A-12)
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
Gate
24V DC IEC 1+ Proximity
(3), (4)
B-24
B-23
B-20
B-25
B-26
B-29
24V DC Contact Switch
(5)
B-24
B-23
B-20
B-25
B-26
B-29
500 mV DC Magnetic Pickup
B-24
B-22
B-20
B-25
B-27
B-29
50 mV DC Magnetic Pickup
(6)
B-24
B-22
B-20
B-25
B-27
B-29
g
Chassis
Ground
(1794-TB3G shown)
Chassis
Ground
+V
COM
24V DC
Supply In
+V
COM
24V DC
Supply Out
Chassis Grounds for Shields
Chassis
Ground
Chassis
Ground
+24V DC = Terminals C-34 and C-50
COM = C-35 and C-51
Chassis Ground = Terminals B-16, B-33, C-38, C-40...45, and C-47
A
B
C
For daisy chaining: Supply in - C-34 (+) and C-35 (-)
Supply out - C-50 (+) and C-51 (-)
3V
6V
24V
PWR
RET
50
mV
SEL
500/50
mV
SEL
F
24V
PWR
24V
PWR
24V
PWR
3V
6V
RET
50
mV
SEL
500/50
mV
SEL
F
RET
50
mV
SEL
500/50
mV
SEL
G
24V
PWR
24V
PWR
RET
50
mV
SEL
500/50
mV
SEL
G
OUT 0
OUT 0
RET
OUT 1
OUT 1
RET
Channel 0 Frequency Input
Channel 0 Gate Input
Channel 1 Frequency Input
Channel 1 Gate Input
Sply0
Sply0
RET
Sply1
Sply1
RET
Channel 0 Output Supply
Channel 1 Output Supply
NC
NC
NC = No connection
NC
NC
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
