FLEX™ I/O Isolated Input Analog Module 3
Publication 1794-IN038E-EN-P - November 2011
5. If continuing DC common to the next base unit, connect a jumper from
terminal 33 (common) on this base unit to terminal 16 on the next base
unit.
6. 1794-TB3T, 1794-TB3TS only: Connect cable shield to terminals 39…46
on row (C).
7. 1794-TB2, 1794-TB3, 1794-TB3S: Connect wiring shields to functional
earth ground as near as possible to the module.
1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T and 1794-TB3TS Terminal Base
Wiring
Connect Wiring for the 1794-TBN
1. Connect individual input wiring to numbered terminals on row (B) as
indicated in the WiringConnections for the 1794-IF4I Input Module table.
2. Connect the associated input common/return to the corresponding
terminal on row (C) for each input as indicated in the table.
3. Connect +V DC power to terminal 34 on row (C).
4. Connect DC common/return to terminal 16 on row (B).
5. If continuing power to the next terminal base, connect a jumper from
terminal 51 (+V DC) on this base unit to terminal 34 on the next base unit.
6. If continuing DC common to the next base unit, connect a jumper from
terminal 33 (common) on this base unit to terminal 16 on the next base
unit.
7. Connect wiring shields to functional earth ground as near as possible to
the module.
Wiring Connections for the 1794-IF4I Input Module
Channel Signal Type Label
Markings
1794-TB2, 1794-TB3, 1794-TB3S,
1794-TB3T, 1794-TB3TS
1794-TBN
Terminal Shield (1794-TB3T,
1794-TB3TS)
Terminal
0 Current I0 A-0 C-39 B-0
Current I0 ret A-1 C-1
Voltage V0 A-2 C-40 B-2
Voltage V0 ret A-3 C-3
1 Current I1 A-4 C-41 B-4
Current I1 ret A-5 C-5
Voltage V1 A-6 C-42 B-6
Voltage V1 ret A-7 C-7
2 Current I2 A-8 C-43 B-8
Current I2 ret A-9 C-9
Voltage V2 A-10 C-44 B-10
Voltage V2 ret A-11 C-11
3 Current I3 A-12 C-45 B-12
Current I3 ret A-13 C-13
Voltage V3 A-14 C-46 B-14
Voltage V3 ret A-15 C-15
-V DC common 1794-TB2, 1794-TB3, 1794-TB3S: Terminals B-16…B-33 are internally connected in the
terminal base unit.
1794-TBN: Terminals B-16 and B-33 are internally connected in the terminal base unit.
1794-TB3T, 1794-TB3TS: Terminals 16, 17, 19, 21, 23, 25, 27, 29, 31 and 33 are internally
connected in the terminal base unit.
+V DC power 1794-TB3, 1794-TB3S: Terminals C-34…C-51 are internally connected in the terminal base
unit.
1794-TB3T, 1794-TB3TS: Terminals C-34, C-35, C-50 and C-51 are internally connected in the
terminal base unit.
1794-TB2, 1794-TBN: Terminals C-34 and C-51 are internally connected in the terminal base
unit.
Chassis ground
(shield)
1794-TB3T, 1794-TB3TS: Terminals C-39…C-46 are internally connected to chassis ground.
Connect only one current or one voltage signal per channel. Do not
connect both current and voltage on one channel.
Do not remove or replace a Terminal Base unit while power is applied.
Interruption of the backplane can result in unintentional operation or
machine motion.
I
+
+
-
+
+
-
I
+
I
+
-
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
45751
Row A
Row B
Row C
Current
input
Current
input
Current
input
Voltage
input
AC or DC
4-wire current
transmitter
DC only
3-wire current
transmitter
Current only
2-wire current
transmitter
DC only
3-wire
transmitter
Label placed at top of wiring area
Row A
Row B
Row C
1794-TB3S shown
(144 pages)
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