6 Rockwell Automation Publication 1756-IN062A-EN-P - August 2017
ControlLogix DC Digital I/O Modules
Wire a Cage Clamp-style RTB
1. Insert the wire into the terminal.
2. Turn the screw clockwise to close the terminal on the wire.
Wire a Spring Clamp
1. Insert the screwdriver into the outer hole of the RTB.
2. Insert the wire into the open terminal and remove the
screwdriver.
Recommendations for Wiring Your RTB
We recommend that you follow these guidelines when wiring your
RTB:
• Begin wiring the RTB at the bottom terminals and move up.
• Use a tie to secure the wires in the strain relief (bottom) area of
the RTB.
• Order and use an extended-depth housing (catalog number
1756-TBE) for applications that require heavy gauge wiring.
Assemble the RTB and the Housing
A removable housing covers the wired RTB to protect wiring
connections when the RTB is seated on the module.
1. Align the grooves at the bottom of each side of the housing
with the side edges of the RTB.
2. Slide the RTB into the housing until it snaps into place.
Install the Removable Terminal Block
Follow these steps to install the RTB onto the module to connect the
wiring.
Before installing the RTB, verify the following:
• Field-side wiring of the RTB is complete.
• The RTB housing is snapped into place on the RTB.
• The RTB housing door is closed.
• The locking tab at the top of the module is unlocked.
1. Align the top, bottom, and left side guides of the RTB with the
guides on the module.
2. Press quickly and evenly to seat the RTB on the module until
the latches snap into place.
3. Slide the locking tab down to lock the RTB onto the module.
ATTENTION: When using catalog numbe1756-TBNH, do not wire
more than two 0.33…1.3 mm
2
(22…16 AWG) conductors on
any terminal. Use only the same size wires with no intermixing of
solid and stranded wire types.
When using the 1756-TBCH, 1756-TBS6H, or the 1756-TBSH, do
not wire more than one 0.33…2.1 mm
2
(22…14 AWG)
conductor on any terminal.
ATTENTION: The ControlLogix system has been agency certified
using only the ControlLogix RTBs. Any application that requires
agency certification of the ControlLogix system by using other
wiring termination methods may require application-specific
approval by the certifying agency.
IMPORTANT If additional wire routing space is required for your application,
use the extended-depth housing, catalog number 1756-TBE.
IMPORTANT The housings that are shown are used with a spring clamp RTB,
but the capacity for each remains the same regardless of RTB type.
WARNING: When you connect or disconnect the removable
terminal block (RTB) with field-side power applied, an electric 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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