{"product_id":"allen-bradley-1756-pls-programmable-limit-switch-module","title":"Allen-Bradley 1756-PLS ControlLogix Programmable Limit Switch Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\u003cp\u003eThe Allen-Bradley 1756-PLS is a high-speed Programmable Limit Switch (PLS) module designed for the ControlLogix 1756 chassis platform. This module provides ultra-low-latency monitoring and control by executing position-based logic directly at the hardware layer, bypassing standard controller backplane scan times. It is specifically engineered for high-velocity applications that require precise position tracking and rapid output actuation, such as rotary indexing, stamping presses, and high-speed packaging lines.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eHardware-level processing for real-time position monitoring and limit comparison.\u003c\/li\u003e\n\u003cli\u003eOccupies three contiguous slots in a ControlLogix chassis.\u003c\/li\u003e\n\u003cli\u003eIncludes 16 digital inputs and 16 solid-state digital outputs.\u003c\/li\u003e\n\u003cli\u003eIsolated I\/O groups to reduce signal crosstalk and enhance noise immunity.\u003c\/li\u003e\n\u003cli\u003eSupports direct interface with high-resolution resolver sensors.\u003c\/li\u003e\n\u003cli\u003eCompatible with 1756-TBNH (cage clamp) and 1756-TBSH (spring clamp) removable terminal blocks.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cp\u003eThis module is ideal for industrial environments where precise timing and position-dependent control are critical, including:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAutomotive stamping and press machinery.\u003c\/li\u003e\n\u003cli\u003eHigh-speed rotary indexing tables.\u003c\/li\u003e\n\u003cli\u003eAutomated bottling and packaging systems.\u003c\/li\u003e\n\u003cli\u003eMaterial handling and high-speed motion synchronization.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1756-PLS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Count\u003c\/td\u003e\n\u003ctd\u003e16 Single-Ended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Count\u003c\/td\u003e\n\u003ctd\u003e16 Solid-State\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e10 to 31.2 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Current\u003c\/td\u003e\n\u003ctd\u003e1.0 A per point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current (5.1V)\u003c\/td\u003e\n\u003ctd\u003e1000 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current (24V)\u003c\/td\u003e\n\u003ctd\u003e125 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Dissipation\u003c\/td\u003e\n\u003ctd\u003e25.7 W (at 30 deg C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.91 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEnsure the ControlLogix chassis power is disconnected before inserting or removing the module to prevent electrical arcing and memory corruption.\u003c\/li\u003e\n\u003cli\u003eThe module requires three contiguous slots; verify chassis space availability prior to installation.\u003c\/li\u003e\n\u003cli\u003eUse shielded cabling for resolver inputs to minimize EMI interference in high-noise industrial environments.\u003c\/li\u003e\n\u003cli\u003eEnsure proper grounding of the chassis backplane to maintain signal integrity.\u003c\/li\u003e\n\u003cli\u003eVerify that the selected Removable Terminal Blocks (RTB) are securely seated and locked into the module housing.\u003c\/li\u003e\n\u003cli\u003eMaintain adequate ventilation around the chassis to manage the 25.7W maximum power dissipation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eDoes the 1756-PLS require a specific terminal block?\u003c\/strong\u003e\u003cbr\u003eYes, the module requires three 1756-TBNH (cage clamp) or 1756-TBSH (spring clamp) removable terminal blocks for field wiring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this module operate independently of the controller scan time?\u003c\/strong\u003e\u003cbr\u003eYes, the 1756-PLS executes positional logic at the hardware level, allowing it to trigger outputs faster than standard backplane-dependent I\/O modules.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":48785454071998,"sku":"1756-PLS","price":79.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/wm_1_1a90b2ae-c75c-4495-a6a4-da1caa37d1c9.jpg?v=1787682112","url":"https:\/\/www.autooiltech.com\/products\/allen-bradley-1756-pls-programmable-limit-switch-module","provider":"AutoOilTech Limited","version":"1.0","type":"link"}