{"product_id":"omron-cj1w-drm21-devicenet-unit-sysmac-cj-series","title":"Omron CJ1W-DRM21 DeviceNet Unit SYSMAC CJ Series","description":"\u003cp\u003eConfigured for DeviceNet industrial network interfacing and multi-node message routing in CJ\/NJ Series architectures, the \u003cstrong\u003eOmron CJ1W-DRM21\u003c\/strong\u003e (\u003cstrong\u003eCJ1W-DRM21\u003c\/strong\u003e DeviceNet Unit) provides direct physical\/electrical execution across trunk and branch transmission topologies.\u003c\/p\u003e\n\u003ch3\u003eTechnical Identifier Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase Hardware Model:\u003c\/strong\u003e CJ1W-DRM21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Part Number:\u003c\/strong\u003e CJ1W-DRM21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e DeviceNet Communication Unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries Family:\u003c\/strong\u003e Omron SYSMAC CJ Series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Classification:\u003c\/strong\u003e CPU Bus Unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupported Controller Families:\u003c\/strong\u003e CJ Series, NJ Series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Node Capacity:\u003c\/strong\u003e 64 nodes (Masters, Slaves, and Configurator)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware 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-DRM21\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\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.118 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e3.1 cm x 7.9 cm x 9.0 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e11.0 cm x 7.0 cm x 13.0 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to +55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e290 mA max at 5 VDC (Internal circuit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunications Power Supply\u003c\/td\u003e\n\u003ctd\u003e11 to 25 VDC (24 VDC nominal, 18 mA max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Protocol\u003c\/td\u003e\n\u003ctd\u003eDeviceNet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSelectable Baud Rates\u003c\/td\u003e\n\u003ctd\u003e500 Kbps, 250 Kbps, 125 Kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Message Length\u003c\/td\u003e\n\u003ctd\u003e542 bytes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection Topology\u003c\/td\u003e\n\u003ctd\u003eMulti-drop and T-branch combinations (trunk and branch lines)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eOmron Backplane Bus Velocity \u0026amp; Real-Time Logic Execution\u003c\/h3\u003e\n\u003cp\u003eThe CJ1W-DRM21 operates as a CJ-series CPU Bus Unit, interfacing directly across the high-velocity backplane bus to exchange cyclic I\/O data and explicit message frames with maximum processing efficiency. Firmware flash memory routines manage protocol mapping into the CPU memory space, enabling deterministic communication synchronization without degrading ladder scan performance or increasing backplane transfer latency.\u003c\/p\u003e\n\u003ch3\u003ePackage Contents \u0026amp; Ordering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1x Omron CJ1W-DRM21 DeviceNet Unit\u003c\/li\u003e\n\u003cli\u003e1x DeviceNet 5-pin open style terminal block connector\u003c\/li\u003e\n\u003cli\u003e1x Hardware instruction sheet\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack Mounting:\u003c\/strong\u003e Align the unit backplane connector with the designated slot on the CJ\/NJ CPU or expansion rack and press until the locking levers engage firmly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNetwork Wiring:\u003c\/strong\u003e Wire the DeviceNet trunk and branch lines using approved 5-wire shielded cables, attaching signal lines V+, CAN_H, Drain, CAN_L, and V- to the terminal block connector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Shielding:\u003c\/strong\u003e Terminate the cable drain wire directly to system ground at a single power supply point, maintaining continuous 360-deg braid shielding across the network.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Grounding:\u003c\/strong\u003e Connect the CPU rack functional earth (FE) terminal to the panel grounding bus using a dedicated conductor with an electrical resistance under 100 Ohms.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eIs hot-swapping supported for the CJ1W-DRM21 on a live CJ\/NJ backplane bus?\u003c\/p\u003e\n\u003cp\u003eNo. Internal system power must be disconnected prior to inserting or removing the unit to prevent hardware logic damage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat current does the CJ1W-DRM21 draw from the internal backplane power supply?\u003c\/p\u003e\n\u003cp\u003eThe unit draws a maximum current of 290 mA at 5 VDC from the internal CPU rack backplane bus supply rail.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the external voltage and current requirement for the DeviceNet interface?\u003c\/p\u003e\n\u003cp\u003eThe DeviceNet physical transceiver operates on 11 to 25 VDC supplied externally, drawing 18 mA maximum.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat selectable transmission speeds are available on the DeviceNet network?\u003c\/p\u003e\n\u003cp\u003eBaud rates are selectable via DIP switches at 500 Kbps, 250 Kbps, or 125 Kbps based on network distance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the maximum node capacity supported by a single CJ1W-DRM21 network line?\u003c\/p\u003e\n\u003cp\u003eThe unit supports up to 64 addressable nodes, which includes Masters, Slaves, and network Configurators.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat maximum message frame length is supported for explicit messaging?\u003c\/p\u003e\n\u003cp\u003eExplicit message communications support a maximum frame length of up to 542 bytes per transmission packet.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow are terminal resistors installed on a DeviceNet network segment?\u003c\/p\u003e\n\u003cp\u003eInstall 121-Ohm, 1\/4-Watt terminating resistors across the CAN_H and CAN_L signal lines at both physical ends of the trunk line.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat grounding resistance limit is required for the controller rack installation?\u003c\/p\u003e\n\u003cp\u003eThe central panel protective earth grounding connection path must maintain an electrical resistance strictly under 100 Ohms.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Omron","offers":[{"title":"Default Title","offer_id":47306659299501,"sku":"CJ1W-DRM21","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/CJ1W-DRM21_1.jpg?v=1788157682","url":"https:\/\/www.maxwellplc.com\/ga\/products\/omron-cj1w-drm21-devicenet-unit-sysmac-cj-series","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}