Rockwell Automation 1794-OA8_OA8K_OA8I_OA16 FLEX I/O Digital AC Output Modules Installation Instructions - Manual (Page 2)

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Publication 1794-IN103B-EN-P - May 2011
Install Your FLEX I/O AC Digital Output Module
The module mounts on a 1794 terminal base.
1. Rotate the keyswitch (3) on the terminal base (4) clockwise to position 8 as
required for this type of module.
2. Make certain the FlexBus connector (1) 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 (7) with its alignment bar (6) aligned with the groove
(5) 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 (2) is locked into the
module.
Connecting Wiring for the 1794-OA8 and 1794-OA8K
1. For 1794-TB2, 1794-TB3, or 1794-TB3S: Connect individual output
wiring to even numbered terminals on the 0…15 row (A) as indicated in
the table, Wiring Connections for the 1794-OA8 and 1794-OA8K.
For 1794-TBN or 1794-TBNF: Connect individual output wiring to even
numbered terminals on the 16…33 row (B) as indicated in the table below.
2. For 1794-TB2, 1794-TB3, or 1794-TB3S: Connect the associated V AC
common (L2) lead of the output device to the corresponding odd
numbered terminal on the 0…15 row (A) for each output as indicated in
the table below; or to the corresponding terminal on the 16…33 row (B).
(The V AC common (L2) terminals of row (B) and the odd numbered
terminals of row (A) are internally connected together.)
For 1794-TBN or 1794-TBNF: Connect the associated V AC common
(L2) lead of the output device to the corresponding odd numbered
terminal on the 34…51 row (C) for each output as indicated in the table
below. (The odd numbered terminals of row (C) are internally connected
together to V AC L2 common.)
3. Connect V AC power L1 to terminal 34 on the 34…51 row (C).
4. Connect V AC common L2 to terminal 16 on the 16…33 row (B).
5. If daisychaining V AC power (L1) to the next terminal base, connect a
jumper from terminal 51 (V AC L1) on this base unit to terminal 34 on the
next base unit.
6. If continuing V AC common (L2) to the next base unit, connect a jumper
from terminal 33 (V common L2) on this base unit to terminal 16 on the
next base unit.
WARNING
Observe the following additional Zone 2 certification
requirements.
• This equipment is not resistant to sunlight or other sources of UV
radiation.
• This equipment must be installed in an enclosure providing at least
IP54 protection when applied in Zone 2 environments.
• This equipment shall be used within its specified ratings defined by
Rockwell Automation.
• Provision shall be made to prevent the rated voltage from being
exceeded by transient disturbances of more than 40% when
applied in Zone 2 environments.
• This equipment must be used only with ATEX certified
Rockwell Automation terminal bases.
• Secure any external connections that mate to this equipment by
using screws, sliding latches, threaded connectors, or other means
provided with this product.
• Do not disconnect equipment unless power has been removed or
the area is known to be nonhazardous.
ATTENTION
Prevent Electrostatic Discharge
This equipment is sensitive to electrostatic discharge, which can cause
internal damage and affect normal operation. Follow these guidelines
when you handle this equipment:
• Touch a grounded object to discharge potential static.
• Wear an approved grounding wriststrap.
• Do not touch connectors or pins on component boards.
• Do not touch circuit components inside the equipment.
• Use a static-safe workstation, if available.
• Store the equipment in appropriate static-safe packaging when not
in use.
WARNING
1794-TBNF and 1794-TBNFK are not approved for Class I Division 2
Applications.
WARNING
If you insert or remove the module while backplane 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.
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IMPORTANT
Total current draw through terminal base connection is limited to 10A. Separate power
connections to each terminal base may be necessary.
ATTENTION
If multiple power sources are used for 1794-OA8I, do not exceed the specified isolation
voltage.
Wiring Connections for the 1794-OA8 and 1794-OA8K
Output (1) 1794-TB2, 1794-TB3, 1794-TB3S 1794-TBN, 1794-TBNF
Output Terminal Common
Terminal (L2) (1)
(1) A-1, 3, 5, 7, 9, 11, 13 and 15 on the 1794-TB2, 1794-TB3 and 1794-TB3S are internally connected in the
module to 120V AC common (L2).
Output Terminal Common
Terminal (L2) (2)
(2) C-1, 3, 5, 7, 9, 11, 13 and 15 on the 1794-TBN and 1794-TBNF are internally connected in the module to
120V AC common (L2).
0 A-0 A-1/B-17 B-0 C-1
1 A-2 A-3/B-19 B-2 C-3
2 A-4 A-5/B-21 B-4 C-5
3 A-6 A-7/B-23 B-6 C-7
4 A-8 A-9/B-25 B-8 C-9
5 A-10 A-11/B-27 B-10 C-11
6 A-12 A-13/B-29 B-12 C-13
7 A-14 A-15/B-31 B-14 C-15
A = Output terminals (Even numbered terminals 0…14)
B = Common terminals
C = Power terminals (C-34 and C-51 on 1794-TB2; C-34…C-51 on
1794-TB3 and 1794-TB3S)
B = Even numbered output terminals 0…14, AC
common terminals 16 and 33
C = Power terminals C-34 and C-51, and odd
numbered output terminals 1…15