{"product_id":"1756-tbnh-allen-bradley-20-position-controllogix-removable-terminal-block","title":"1756-TBNH Allen-Bradley 20-Position ControlLogix Removable Terminal Block","description":"\u003ch3\u003e\u003cb\u003eProduct Overview | Field Wiring Interface\u003c\/b\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #C65D21;\"\u003eAllen-Bradley 1756-TBNH\u003c\/span\u003e\u003c\/strong\u003e is a 20-position removable terminal block (RTB) for compatible ControlLogix I\/O modules. It provides a screw-clamp interface between field wiring and the module's terminal connections.\u003c\/p\u003e\n\n\u003cp\u003eDesigned for industrial control cabinets, the \u003cstrong\u003e1756-TBNH\u003c\/strong\u003e supports organized field wiring and simplifies module removal during planned maintenance. Its NEMA-style screw-clamp construction secures compatible conductors at the terminal interface.\u003c\/p\u003e\n\n\u003cp\u003eThis component is an I\/O accessory, not a standalone controller or signal-processing module. Confirm the exact I\/O module compatibility before installation.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Rockwell Automation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Allen-Bradley\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct family:\u003c\/strong\u003e ControlLogix\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan style=\"color: #C65D21;\"\u003e1756-TBNH\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent type:\u003c\/strong\u003e Removable Terminal Block (RTB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal configuration:\u003c\/strong\u003e 20-position screw clamp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary function:\u003c\/strong\u003e Field wiring termination for compatible 1756 I\/O modules\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cb\u003eTechnical Data | Electrical and Mechanical Reference\u003c\/b\u003e\u003c\/h3\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eRockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e1756-TBNH\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eControlLogix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule category\u003c\/td\u003e\n\u003ctd\u003eRemovable Terminal Block accessory\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal arrangement\u003c\/td\u003e\n\u003ctd\u003e20 positions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamp mechanism\u003c\/td\u003e\n\u003ctd\u003eScrew clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire range\u003c\/td\u003e\n\u003ctd\u003e22–14 AWG (approximately 0.33–2.1 mm²), according to the supplied data\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConductor type\u003c\/td\u003e\n\u003ctd\u003eSolid or stranded copper; follow the manufacturer's wiring requirements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConductor temperature rating\u003c\/td\u003e\n\u003ctd\u003e90°C minimum, according to the supplied wiring specification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum screw torque\u003c\/td\u003e\n\u003ctd\u003e1.36 N·m, as stated in the supplied description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum screwdriver blade width\u003c\/td\u003e\n\u003ctd\u003e8 mm (5\/16 in.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum conductors per terminal\u003c\/td\u003e\n\u003ctd\u003eTwo, subject to the applicable wiring instructions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating temperature\u003c\/td\u003e\n\u003ctd\u003e0°C to 60°C (32°F to 140°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApproximately 0.1 kg (0.3 lb, rounded in the supplied data)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e5.51 × 4.41 × 5.71 in., as supplied; verify orientation and drawing dimensions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure\u003c\/td\u003e\n\u003ctd\u003eNo separate enclosure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e10612598171856\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eData verification:\u003c\/strong\u003e The supplied source also lists backplane current and power dissipation values. These values may relate to a different component or may have been transcribed incorrectly. Do not use them as terminal-block ratings without confirmation from the applicable Rockwell Automation documentation.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cb\u003eTerminal Design | What Matters in the Panel\u003c\/b\u003e\u003c\/h3\u003e\n\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwenty termination positions:\u003c\/strong\u003e Provides a defined connection arrangement for compatible field circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScrew-clamp retention:\u003c\/strong\u003e Secures conductors when installers apply the specified torque.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemovable interface:\u003c\/strong\u003e Allows the terminal block to disconnect from a compatible I\/O module during approved maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeparate field wiring:\u003c\/strong\u003e Helps organize conductors at the I\/O module boundary.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControlLogix integration:\u003c\/strong\u003e Supports the field-side wiring requirements of compatible 1756 I\/O modules.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003eThe terminal block does not determine signal type, channel resolution, input range, or output capacity. Those characteristics depend on the connected I\/O module.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cb\u003eCompatibility Map | Choose by Module First\u003c\/b\u003e\u003c\/h3\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSystem Component\u003c\/th\u003e\n\u003cth\u003eCompatibility Requirement\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eControlLogix digital input module\u003c\/td\u003e\n\u003ctd\u003eVerify the module's specified RTB catalog number and terminal arrangement.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControlLogix digital output module\u003c\/td\u003e\n\u003ctd\u003eConfirm the terminal block matches the exact module variant.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControlLogix analog I\/O module\u003c\/td\u003e\n\u003ctd\u003eCheck the required RTB type and field wiring configuration.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControlLogix chassis\u003c\/td\u003e\n\u003ctd\u003eThe chassis supports the I\/O module; the RTB attaches to the module's front interface.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField instruments and actuators\u003c\/td\u003e\n\u003ctd\u003eVerify signal requirements, conductor size, terminal assignments, and electrical ratings against the I\/O module documentation.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eSelection rule:\u003c\/strong\u003e Do not select an RTB based only on the ControlLogix family name. Check the exact I\/O module catalog number and its approved terminal-block options.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cb\u003eInstallation Procedure | Safe and Repeatable Wiring\u003c\/b\u003e\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep 1 — Identify:\u003c\/strong\u003e Record the I\/O module catalog number and confirm the required terminal block.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep 2 — Isolate:\u003c\/strong\u003e Follow site lockout procedures and verify that the relevant circuits are safe to handle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep 3 — Inspect:\u003c\/strong\u003e Check the terminal block, screw threads, contact surfaces, and housing for damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep 4 — Prepare conductors:\u003c\/strong\u003e Use the specified copper wire size and temperature rating. Strip insulation to the length required by the manufacturer's instructions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep 5 — Terminate:\u003c\/strong\u003e Connect each conductor to its assigned position. Observe polarity and channel identification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep 6 — Tighten:\u003c\/strong\u003e Apply the specified torque using a suitable tool.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep 7 — Inspect:\u003c\/strong\u003e Check conductor retention, exposed copper, insulation clearance, and terminal labeling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep 8 — Commission:\u003c\/strong\u003e Restore power according to site procedures and verify the corresponding I\/O channel status.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWiring precaution:\u003c\/strong\u003e The supplied description advises against mixing solid and stranded conductors in the same terminal block. Follow the applicable manufacturer instructions for conductor type, terminal loading, and any permitted combinations.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cb\u003eField Diagnostics | Common Wiring Faults\u003c\/b\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #C65D21;\"\u003e1756-TBNH\u003c\/span\u003e\u003c\/strong\u003e is a passive wiring accessory. It does not contain independent diagnostic electronics or generate channel alarms.\u003c\/p\u003e\n\n\u003cp\u003eHowever, poor termination can cause intermittent I\/O signals, unstable readings, or unexpected field-device behavior. A structured inspection can help isolate these issues.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntermittent input:\u003c\/strong\u003e Inspect conductor retention, terminal tightness, and field-device wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMissing output response:\u003c\/strong\u003e Verify terminal assignments, the output module's status, and the connected load circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnstable analog readings:\u003c\/strong\u003e Check conductor identification, shielding practices, grounding, and signal wiring against the module manual.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecurring channel faults:\u003c\/strong\u003e Compare channel diagnostics with terminal inspection results before replacing the I\/O module.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverheating or discoloration:\u003c\/strong\u003e Isolate the circuit and investigate loose connections, excessive current, or damaged components before returning the system to service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eUse controller diagnostics and the I\/O module's indicators to distinguish a field wiring problem from a module or configuration fault.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cb\u003eApplication Scenarios | Where This RTB Is Used\u003c\/b\u003e\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiscrete signal termination:\u003c\/strong\u003e Connect compatible proximity switches, limit switches, and digital field devices.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput wiring:\u003c\/strong\u003e Terminate supported control circuits for compatible output modules.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProcess instrumentation:\u003c\/strong\u003e Provide field wiring connections for supported analog I\/O modules.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachine control panels:\u003c\/strong\u003e Organize sensor and actuator connections in ControlLogix cabinets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistributed I\/O systems:\u003c\/strong\u003e Support field-side wiring in appropriately configured ControlLogix architectures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintenance and repair:\u003c\/strong\u003e Replace a damaged terminal block without changing the I\/O module, when the installed module supports this exact RTB.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cb\u003eGlobal PLC Spare HUB's Insight\u003c\/b\u003e\u003c\/h3\u003e\n\n\u003cp\u003eIn control-panel maintenance, terminal-block selection and wiring discipline directly affect troubleshooting time. Engineers should verify the RTB catalog number before disconnecting an installed assembly.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePractical example:\u003c\/strong\u003e A digital input intermittently changes state while a machine runs. The technician checks the field sensor, reviews the controller input status, and inspects the terminal connection. A loose conductor may explain the symptom, but the technician should also verify the sensor supply and input module before concluding that the terminal block caused the fault.\u003c\/p\u003e\n\n\u003cp\u003eFor a planned replacement, photograph the existing wiring labels and document each terminal assignment before removing conductors. This practice reduces wiring errors during recommissioning and supports traceable maintenance records.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eEngineering recommendation:\u003c\/strong\u003e Treat the \u003cstrong\u003e\u003cspan style=\"color: #C65D21;\"\u003e1756-TBNH\u003c\/span\u003e\u003c\/strong\u003e as a module-specific interface component. Confirm compatibility, conductor requirements, and terminal torque using the relevant installation manual rather than relying on appearance alone.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cb\u003eFive Professional FAQs | Selection and Troubleshooting\u003c\/b\u003e\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ1: How can a terminal-block replacement be validated before the machine returns to production?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eVerify each conductor against the wiring diagram and terminal schedule. Check mechanical retention, polarity, and insulation clearance. Then test the affected I\/O points and confirm normal operation under the site's commissioning procedure.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ2: What information helps identify the correct terminal block when the original label is unreadable?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eRecord the complete I\/O module catalog number, module series, terminal arrangement, and existing connector dimensions. Use the manufacturer's compatibility documentation to identify the correct accessory. Do not rely on dimensions alone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ3: Why can a wiring fault appear only when a machine vibrates?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eVibration may expose a weak termination, damaged conductor, or insufficient strain relief. Inspect the wire entry, terminal clamping, and cable support. Correct the underlying mechanical issue before repeating operational tests.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ4: Is this component suitable for outdoor or wet-area installation?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe supplied information describes use in a clean, dry industrial environment and lists no separate enclosure. Provide suitable cabinet protection and confirm environmental requirements for the complete installation. Do not treat the terminal block itself as a sealed outdoor component.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ5: What should be included in a spare-parts order for planned maintenance?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eInclude the exact catalog number, required quantity, compatible I\/O module details, delivery destination, and requested lead time. If possible, provide a photograph of the installed module label. Confirm packaging, accessories, warranty terms, and shipment timing in the quotation.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cb\u003eSupply, Warranty and Logistics\u003c\/b\u003e\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Allen-Bradley 1756-TBNH ControlLogix removable terminal block.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage protection:\u003c\/strong\u003e Protective packaging suitable for industrial electrical components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage contents:\u003c\/strong\u003e Confirm the supplied terminal block and any included accessories with the seller before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 12 months, subject to the seller's written warranty terms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping carriers:\u003c\/strong\u003e FedEx, UPS, and DHL, subject to destination and service availability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDispatch target:\u003c\/strong\u003e Within 24–48 hours after order confirmation, subject to stock availability and order processing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cb\u003eRequest a Quote | Confirm Your ControlLogix Configuration\u003c\/b\u003e\u003c\/h3\u003e\n\n\u003cp\u003eContact \u003cstrong\u003eGlobal PLC Spare HUB\u003c\/strong\u003e for pricing, availability, and compatibility assistance for the \u003cstrong\u003e\u003cspan style=\"color: #C65D21;\"\u003eAllen-Bradley 1756-TBNH\u003c\/span\u003e\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eSend your I\/O module catalog number, required quantity, and delivery destination. Our team can review the requested configuration and provide a quotation for your maintenance or spare-parts requirements.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":67651566764214,"sku":"1756-TBNH","price":110.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1756-TBNH-3.jpg?v=1792122744","url":"https:\/\/www.plcsparehub.com\/products\/1756-tbnh-allen-bradley-20-position-controllogix-removable-terminal-block","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}