{"product_id":"cj1w-crm21-omron-cj-series-componet-master-unit","title":"CJ1W-CRM21 Omron CJ Series CompoNet Master Unit","description":"\u003cp\u003eThe \u003cstrong\u003eOmron CJ1W-CRM21\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eCJ1W-CRM21\u003c\/strong\u003e CompoNet Master Unit, operates as a dedicated hardware component for high-speed fieldbus I\/O bus management and slave node data cyclic exchanging within CJ Series PLC backplanes.\u003c\/p\u003e\n\u003ch3\u003eArchitecture Classification \u0026amp; Functional Design\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eOmron CJ1W-CRM21\u003c\/strong\u003e module interfaces directly with CJ Series system bus slots, acting as a specialized bus controller:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCJ1W\u003c\/strong\u003e: Dedicated module series platform for Omron CJ1G, CJ1M, CJ2M, and CJ2H programmable controllers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCRM\u003c\/strong\u003e: Designation for CompoNet fieldbus protocol master hardware.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e21\u003c\/strong\u003e: Specific hardware release iteration for high-density I\/O allocation and communication power monitoring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Classification\u003c\/strong\u003e: Mapped as a Special I\/O Unit using hardware rotary switches to define unit numbers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePhysical and Electrical Specifications\u003c\/h3\u003e\n\u003cfigure\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\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\u003eCJ1W-CRM21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eOmron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUnit Type\u003c\/td\u003e\n\u003ctd\u003eSpecial I\/O Unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Consumption\u003c\/td\u003e\n\u003ctd\u003e400 mA max. at 5 VDC (Backplane bus)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e2.0 W max.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunications Power Current Capacity\u003c\/td\u003e\n\u003ctd\u003e5 A max. via connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply Detection\u003c\/td\u003e\n\u003ctd\u003eCommunications power ON\/OFF monitoring via terminal connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNoise Immunity\u003c\/td\u003e\n\u003ctd\u003eIEC 61000-4-4 2 kV (power supply line)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShock Resistance\u003c\/td\u003e\n\u003ctd\u003e196 m\/s2 (3 times each in X, Y, and Z directions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhysical Dimensions\u003c\/td\u003e\n\u003ctd\u003e31 mm x 80 mm x 97 mm (W x D x H)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUnit Weight\u003c\/td\u003e\n\u003ctd\u003e0.13 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e1.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e160 mm x 120 mm x 50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDeterministic Network Management \u0026amp; Bus Synchronicity\u003c\/h3\u003e\n\u003cp\u003eThe unit coordinates deterministic networks across CompoNet remote slaves, handling rapid cyclic I\/O refreshes and message communications simultaneously. Backplane bus communication velocity allows seamless memory transfer between the controller CPU and remote slave registers without impacting scan timing. Firmware flash compatibility ensures persistent network layout retention and predictable boot execution across power recycling events.\u003c\/p\u003e\n\u003ch3\u003ePackage Component List\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Omron CJ1W-CRM21 CompoNet Master Unit\u003c\/li\u003e\n\u003cli\u003e1 x CompoNet communication power supply connector assembly\u003c\/li\u003e\n\u003cli\u003e1 x Panel installation sheet\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Termination \u0026amp; Grounding Rules\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Power Isolation\u003c\/strong\u003e: Always disconnect the PLC backplane power supply before inserting or removing the module from the rack slot.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommunication Cable Shielding\u003c\/strong\u003e: Use specified CompoNet round cables or flat cables. Ground the cable shield wire at a single point to panel ground.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply Monitoring Wire\u003c\/strong\u003e: Ensure proper polarity when wiring the external communications power supply to enable real-time ON\/OFF monitoring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Fastening\u003c\/strong\u003e: Secure communication cable connector screws completely to resist panel vibration up to 196 m\/s2 acceleration limits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eWhat causes the unit to flag a communication power error?\u003c\/p\u003e\n\u003cp\u003eThe module actively monitors the communications power supply connector. If 24 VDC external bus power drops below threshold levels, an ON\/OFF fault is registered.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIs hot-swapping supported for the CJ1W-CRM21 on a live CJ rack?\u003c\/p\u003e\n\u003cp\u003eNo. Removing or inserting the unit while the CJ backplane power supply is turned on will cause a bus communication error and halt execution.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow much current does the unit draw directly from the PLC backplane?\u003c\/p\u003e\n\u003cp\u003eThe unit draws a maximum current of 400 mA at 5 VDC directly from the internal PLC rack power supply.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the maximum current capacity allowed through the communications power connector?\u003c\/p\u003e\n\u003cp\u003eThe communications power supply connector supports a maximum current capacity of 5 A for downstream network node power distribution.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCan the unit operate in any standard slot on a CJ-series expansion rack?\u003c\/p\u003e\n\u003cp\u003eYes. The unit can be placed in standard Special I\/O slots on CJ-series CPU Racks or Expansion Racks, provided power supply ratings are met.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow is the module identified within the PLC memory mapping table?\u003c\/p\u003e\n\u003cp\u003eThe module is assigned a Special I\/O Unit number from 0 to 95 via front-panel rotary switches to allocate memory space in CPU words.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDoes the CJ1W-CRM21 require separate external power for its logic operations?\u003c\/p\u003e\n\u003cp\u003eInternal logic runs on 5 VDC backplane power, but external power is required across the network connector to drive fieldbus transceiver circuits.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow does the module handle high electrical noise in harsh environments?\u003c\/p\u003e\n\u003cp\u003eThe unit features integrated protection conforming to IEC 61000-4-4 standards, withstanding fast transient bursts up to 2 kV on power lines.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Omron","offers":[{"title":"Default Title","offer_id":47306656153773,"sku":"CJ1W-CRM21","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/CJ1W-CRM21_3.jpg?v=1788155143","url":"https:\/\/www.maxwellplc.com\/products\/cj1w-crm21-omron-cj-series-componet-master-unit","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}