Allen-Bradley 5069-RTB18-SCREW 18-Pin Screw Terminal Block

The 18-pin screw RTB for Compact 5000 I/O

The Allen-Bradley 5069-RTB18-SCREW is an 18-pin screw-type removable terminal block for Compact 5000 I/O modules. Rockwell Automation describes it as a terminal block kit sold in a pack of one piece. The block carries the field wiring for a module, and it plugs into the front of the module so the module can be removed without disturbing the wiring.

RTBs do not ship with Compact 5000 I/O modules, so every module needs its own terminal block ordered separately. Order only the RTB type that your system requires. The product page lists a temperature rating of 0 to 60 °C and the country of origin is given as Germany.

Technical specifications

Wiring requirements

The terminal accepts shielded copper wire from 0.34 to 1.5 mm² (22 to 16 AWG) rated at 105 °C or greater. Only one wire may be connected to a terminal, and the maximum outside diameter of the wire including insulation is 3.5 mm. Strip the insulation 12 mm and tighten the screw to 0.4 N•m. For the 5069-OW16 relay module, the data sheet calls for at least 18 AWG wire on the load connections.

Screw or spring version

The spring-type 5069-RTB18-SPRING accepts a smaller maximum wire diameter of 2.9 mm and uses a 10 mm strip length. Choose the screw type if you prefer a torque-controlled connection. The terminal block fits the 18-point analog and digital modules in the family, such as the 5069-IF8 and the 5069-IY4 listed in the Compact 5000 I/O specifications.

Label each wire so that it can be returned to the same terminal if the block is removed, and install or remove the block only when plant rules for the application allow it.

Selection checks for a Compact 5000 I/O project

Start from the I/O list of the project. Count the modules that use an 18-pin terminal block, subtract any that need the cold-junction version for thermocouple use, and then decide whether screw or spring blocks will be the plant standard. Mixing connection types in one cabinet is possible but makes maintenance harder, because technicians need different tools and different stripping lengths. It is also worth checking the wire cross-sections planned in the panel design against the range accepted by the screw RTB, particularly for relay output circuits where a heavier conductor is required.

Pre-wiring and installation in the panel

A practical advantage of a removable terminal block is that field wiring can be terminated on the bench or in the panel before the I/O modules are fitted. Prepare conductors with the specified stripping length, use one conductor per terminal, and tighten each screw with a calibrated screwdriver set to the stated torque rather than by feel. Over-tightening can damage the conductor or the terminal, while under-tightening can lead to intermittent signals that are hard to trace.

Arrange the cable duct so that wires approach the block without tension and can be dressed neatly, and leave enough slack for the block to be pulled off the module without disconnecting the conductors. Shielded analog cables should be terminated according to the grounding guidance in the Rockwell Automation documentation.

Commissioning and loop checks

Before power is applied, check every termination against the wiring diagram and perform continuity tests on the field circuits. During loop checks, confirm that each signal appears at the expected channel in the controller. Any mismatch is easier to correct before the panel leaves the workshop or before the plant starts production.

Panel conditions in Oman and the GCC

The terminal block is rated for operation up to 60 °C, but control panels in Omani plants and outdoor kiosks can become very hot in summer, so the cabinet cooling design should keep the internal temperature within the limits of both the modules and their terminal blocks. Fine dust entering through poorly sealed doors can settle around terminals, and humid coastal air can encourage corrosion on exposed copper. Use filtered or sealed enclosures and keep panel doors closed.

Maintenance practice

During planned shutdowns, inspect terminals for discolouration or loose conductors, retighten to the specified torque where your maintenance procedure calls for it, and clean dust from the panel with suitable methods. Keep wire labels legible so that each conductor can be returned to its terminal after any repair.

Spare blocks for site support

Some maintenance teams keep a small number of pre-labelled spare terminal blocks with the panel documentation. When a block is damaged, a replacement can then be wired in a controlled way, terminal by terminal, against the drawing.

Documents and quotation

When you plan a panel, count one RTB for every Compact 5000 I/O module and decide in advance between screw and spring types. The Rockwell Automation Compact 5000 I/O specifications, publication 5069-TD001, are attached. See our automation accessories catalogue and PLC and I/O cards. Confirm the exact catalog number, series letter and firmware or hardware revision on the product label, and the compatibility with your existing system, before ordering. Stock and lead time are confirmed at quotation.