Rockwell Automation 1794-IH16 FLEX I/O 125V dc Digital Input Module - Manual (Page 2)

2 FLEX I/O 125V dc Digital Input Module
Publication 1794-IN118A-EN-P - June 2008
Install Your Digital Module
The module mounts on a 1794 terminal base.
1. Rotate the keyswitch (1) on the terminal base (2) clockwise to position 1 as
required for this type of module.
2. Make certain the flexbus connector (3) is pushed all the way to the left to
connect with the neighboring terminal base/adapter.
You cannot install the module unless the connector is fully extended.
3. Make sure the pins on the bottom of the module are straight so they will
align properly with the connector in the terminal base.
4. Position the module (4) with its alignment bar (5) aligned with the groove
(6) on the terminal base.
5. Press firmly and evenly to seat the module in the terminal base unit. The
module is seated when the latching mechanism (7) is locked into the
module.
Connect Wiring for your Module
(using a 1794-TB3 or TB3S)
1. Connect individual input wiring to numbered terminals on the 0-15 row (A)
as indicated in Table 1.
2. Connect the associated input device +V dc to the corresponding terminal
on the 34-51 row (C) for each input as indicated in Table 1. If using 3-wire
input devices, also connect the associated input common lead to the
corresponding terminal on the 16-33 row (B).
3. Connect +V dc power to terminal 34 on the 34-51 row (C).
4. Connect dc common to terminal 16 on the 16-33 row (B).
5. If daisychaining 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.
1794-TB3 and -TB3S Terminal Base Wiring for 1794-IH16
2 and 3-Wire Input Wiring for 1794-IH16
IMPORTANT
To comply with North American restrictions, all connected I/O must be
powered from a source compliant with the following:
Class 2
WARNING
If you connect or disconnect wiring while the field-side power is on, an
electrical arc can occur. This could cause an explosion in hazardous
location installations. Be sure that power is removed or the area is
nonhazardous before proceeding.
Description Description
1 Keyswitch 5 Alignment bar
2 Terminal base 6 Groove
3 Flexbus connector 7 Latching mechanism
4 Module
ATTENTION
Do not remove or replace a Terminal Base unit when power is applied.
Interruption of the backplane can result in unintentional operation or
machine motion.
ATTENTION
During mounting of all devices, be sure that all debris (metal chips, wire
strands, etc.) is kept from falling into the module. Debris that falls into the
module could cause damage on power up.
1
2
3
4
5
6
7
Table 1 Wiring Connections for 1794-IH16
Channel Signal Power Terminal Common Terminal (1)
(1) 2-wire devices use the input and power terminals.
3-wire devices use the input, common and power terminals
0 A-0 C-35 B-17
1 A-1 C-36 B-18
2 A-2 C-37 B-19
3 A-3 C-38 B-20
4 A-4 C-39 B-21
5 A-5 C-40 B-22
6 A-6 C-41 B-23
7 A-7 C-42 B-24
8 A-8 C-43 B-25
9 A-9 C-44 B-26
10 A-10 C-45 B-27
11 A-11 C-46 B-28
12 A-12 C-47 B-29
13 A-13 C-48 B-30
14 A-14 C-49 B-31
15 A-15 C-50 B-32
+V DC C-34 thru C-51 are internally connected together.
Common B-16 thru B-33 are internally connected together.
IMPORTANT
To comply with the CE Low Voltage Directive (LVD), all connected I/O must
be powered from a source compliant with the following: Safety Extra Low
Voltage (SELV) or Protected Extra Low Voltage (PELV).
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
Inputs
Commons
(1794-TB3 shown) Connect V dc common to terminal B-16
Connect +V dc power to terminal C-34
-V
Voltage
In +V Voltage
Out +V Voltage
A
B
C
(Use B-33 and C-51 for daisy-chaining to next terminal base unit)
Common
-V
Common
= 24V dc
= Common
= Sink Input
0 -15
34-51
16-33
A
B
C
2-Wire Device
(Sourcing Output)
A
B
C
0 1 0 1
3-Wire Device
(Sourcing Output)
0
16
34