ControlLogix System

Catalogs > Automation Systems Catalog > Programmable Controllers > ControlLogix System > I/O Modules

I/O Modules

Accessories—I/O Modules



Removable Terminal Blocks

Removable terminal blocks (RTBs) provide a flexible interconnection between your plant wiring and 1756 I/O modules. The RTB plugs into the front of the I/O module. The type of module determines which RTB you need. You can choose screw-clamp or spring-clamp RTBs.

RTBs are not shipped with I/O modules. You must order them separately. The standard housing on the front of the wiring arm is not deep enough for 2.5 mm² (14 AWG) wiring. If you plan to use 2.5 mm² (14 AWG) wiring, also order the extended housing.

Removable Terminal Blocks

Specifications [PDF]

Cat. No.	1756-TBNH	1756-TBSH	1756-TBCH	1756-TBS6H	1756-TBE
Description	20-position NEMA screw-clamp RTB	20-pin spring-clamp RTB with standard housing	36-pin cage-clamp RTB with standard housing	36-pin spring-clamp RTB with standard housing	Extended depth terminal block housing
Screw Torque	0.8…1 N•m 7…9 lb•in		0.4 N•m 4.4 lb•in		—
Screwdriver width	8 mm (5/16 in.) max

Wiring Systems

As an alternative to buying RTBs and connecting the wires yourself, you can buy a wiring system of:

• interface modules (IFMs) that provide the output terminal blocks for digital I/O modules. Use the pre-wired cables that match the I/O module to the IFM.
  
• analog interface modules (AIFMs) that provide the output terminal blocks for analog I/O modules. Use the pre-wired cables that match the I/O module to the AIFM.
  
• I/O module-ready cables. One end of the cable assembly is an RTB that plugs into the front of the I/O module. The other end has individually color-coded conductors that connect to a standard terminal block.
  

For more information, see the Allen-Bradley Industrial Controls Catalog, Terminal Blocks and Wiring Systems.

Or find a wiring system for your I/O module using our Build a Catalog Number product selection tool.