{"product_id":"allen-bradley-1746-io12dc-slc-500-combination-i-o-module","title":"Allen-Bradley 1746-IO12DC SLC 500 Combination I\/O Module","description":"\u003ch1\u003eAllen-Bradley 1746-IO12DC SLC 500 Combination I\/O Module\u003c\/h1\u003e\n\u003cp\u003eConfigured for mixed discrete signal acquisition and relay-based load switching in SLC 500 backplane architecture, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1746-IO12DC\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1746-IO12DC\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCombination I\/O Module) provides direct physical\/electrical execution of field input sensing and output actuation across SLC 500 chassis systems.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e1746\u003c\/strong\u003e: SLC 500 I\/O platform family identifier\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIO12\u003c\/strong\u003e: 12 total I\/O points (6 inputs + 6 outputs)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDC\u003c\/strong\u003e: DC input domain variant with relay output interface\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNo additional functional segmentation defined in provided dataset\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1746-IO12DC\u003c\/td\u003e\n\u003c\/tr\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\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.99 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0–60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e~3.9 W heat dissipation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs\u003c\/td\u003e\n\u003ctd\u003e6 points, 10–30 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutputs\u003c\/td\u003e\n\u003ctd\u003e6 relay contact outputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e5–265 VAC, 5–125 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Current\u003c\/td\u003e\n\u003ctd\u003e1.2 A at 24 VDC, 1.5 A at 120 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e0.08 A at 5 VDC, 0.06 A at 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eOptical isolation between input and output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Delay\u003c\/td\u003e\n\u003ctd\u003eON ~35 ms, OFF ~45 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShock\/Vibration\u003c\/td\u003e\n\u003ctd\u003e30G shock, 2.5G vibration (57–200 Hz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSLC 500 Backplane Deterministic I\/O Execution\u003c\/h3\u003e\n\u003cp\u003eThe module operates as a slot-addressed I\/O node on the SLC 500 backplane, where input status is scanned cyclically and mapped into processor memory during chassis scan cycles. Output relay states are updated in synchronization with the PLC scan execution, with timing constrained by module-level switching latency and backplane refresh intervals.\u003c\/p\u003e\n\u003cp\u003eOptical isolation between input sensing circuitry and relay output stage separates low-voltage DC detection from high-energy switching paths. Relay contact outputs introduce mechanical switching delay characteristics defined by ON\/OFF response times, independent of processor scan resolution.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1746-IO12DC module be hot-swapped in an energized SLC 500 chassis?\u003cbr\u003eA: No. Backplane insertion or removal requires chassis power down to avoid signal corruption and potential damage to the I\/O bus interface.\u003c\/p\u003e\n\u003cp\u003eQ: How is backplane current load distributed for this module?\u003cbr\u003eA: The module draws current from both 5 VDC and 24 VDC backplane rails; total chassis power budget must include cumulative load from all installed modules.\u003c\/p\u003e\n\u003cp\u003eQ: Do relay outputs maintain state during PLC scan interruption?\u003cbr\u003eA: Relay states are mechanically latched but controlled by PLC output commands; loss of backplane communication will freeze last commanded state until system recovery.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstallation must be performed with chassis power removed. The module shall be inserted into an SLC 500 compatible slot with full engagement of the backplane connector to ensure stable signal and power contact.\u003c\/p\u003e\n\u003cp\u003eField wiring should be routed using separated cable paths for input and output terminals to reduce inductive and switching interference. Relay output wiring must account for mechanical contact wear and include suppression components for inductive loads where applicable.\u003c\/p\u003e\n\u003cp\u003eTerminal blocks must be fully seated and secured prior to system energization. Shield termination should follow standard industrial grounding practice at a single-point earth reference to avoid ground loops.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43505097211994,"sku":"1746-IO12DC","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1746-IO12DC2.jpg?v=1781594616","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1746-io12dc-slc-500-combination-i-o-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}