Purchase now: Allen-Bradley 1756-JMPR ControlLogix RTB Jumpers
Atlantechdrives provides you the 1756-JMPR, a specialized set of terminal block jumpers designed specifically for the Allen-Bradley ControlLogix 1756 Removable Terminal Blocks (RTB). While small in size, the 1756-JMPR is an essential accessory for professional control panel wiring, allowing for the efficient «daisy-chaining» of common or power connections across multiple points on a single module.
- Type: Removable Terminal Block Jumper
- Compatibility: All 1756-TBNH and 1756-TBSH blocks
- Current Rating: Rated for full terminal block capacity
- Quantity: Typically sold in packs of 10
- Material: High-conductivity copper alloy with protective plating
Technical Utility: Streamlining Cabinet Power Distribution
The 1756-JMPR is engineered to eliminate the «rat’s nest» of wiring often found in poorly organized control cabinets. In high-density modules where multiple inputs or outputs share a common return or power source, using the 1756-JMPR allows for a clean, internal bridge between terminals. This eliminates the need to cram two or three wires into a single screw terminal, which is a leading cause of loose connections and arcing. By using the 1756-JMPR, you maintain the «Removable» benefit of the 1756 RTB system; the jumpers stay with the block, meaning you can swap the I/O module without disturbing the common power distribution logic. This is a critical factor for maintaining the IP20 safety rating of the terminal block housing.
Installation Advice: Secure Fitting and Commoning
When installing the 1756-JMPR, ensure the jumper is fully inserted into the terminal’s pressure plate before tightening the screw. A common mistake is «hanging» the jumper on the outside of the terminal, which leads to high resistance and potential failure under load. For 32-point high-density modules, the 1756-JMPR is a lifesaver for connecting all the «COM» or «VDC» pins together with a single external feed. We recommend using the 1756-JMPR instead of manual wire loops to reduce the overall volume of the wiring bundle, ensuring that the terminal block cover can close securely and that the module can be latched into the chassis without mechanical stress.
Maintenance and Troubleshooting Loose Commons
Although the 1756-JMPR is a simple mechanical link, it should be part of your annual «torque check» routine. Industrial vibration can eventually loosen the screws holding the jumpers, leading to intermittent power loss across an entire group of I/O points. If you find multiple inputs or outputs on a single module failing simultaneously, the 1756-JMPR connection is the first place to look. Keeping a pack of 1756-JMPR in your maintenance kit is highly recommended, as they are frequently lost during field repairs or panel modifications. Using authentic Allen-Bradley jumpers ensures that the metal-to-metal contact is optimized for the ControlLogix terminal’s specific geometry.
FAQs
Q: Can I cut the 1756-JMPR to a custom length?
A: These are typically single-point-to-point jumpers, but they can be used in sequence to bridge multiple points.
Q: Are these compatible with 1756-TBCH 36-pin blocks?
A: The 1756-JMPR is primarily designed for the 20-pin TBNH/TBSH series; check pin spacing for high-density 36-pin blocks.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
These backplane jumpers are essential for manual slot address configuration within a standard 1756-A4 compact rack.
