{"product_id":"omron-cj1w-srm21-input-output-control-module-sysmac-cj1-series","title":"Omron CJ1W-SRM21 Input Output Control Module SYSMAC CJ1 Series","description":"\u003cp\u003eThe \u003cstrong\u003eOmron CJ1W-SRM21\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eCJ1W-SRM21\u003c\/strong\u003e Input Output Control Module, operates as a dedicated hardware component for CompoBus\/S master communication execution and field I\/O bus integration within Omron CJ-Series PLCs.\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-SRM21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Part Number:\u003c\/strong\u003e CJ1W-SRM21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Classification:\u003c\/strong\u003e Special I\/O Unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Controllers:\u003c\/strong\u003e Omron CJ-Series PLCs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax Mountable Master Units:\u003c\/strong\u003e 40 units per CPU system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNode Addressing Capacity:\u003c\/strong\u003e 8 addresses per mode\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Slave Capacity:\u003c\/strong\u003e 32 connectable slaves\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\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-SRM21\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\u003e1.20 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e9.0 cm x 3.1 cm x 6.5 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e15.0 cm x 10.0 cm x 8.0 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\u003e5 VDC internal backplane draw (0.15 A max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWord Allocation (256 I\/O)\u003c\/td\u003e\n\u003ctd\u003e20 words (8 input words, 8 output words, 4 status words)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWord Allocation (128 I\/O)\u003c\/td\u003e\n\u003ctd\u003e10 words (4 input words, 4 output words, 2 status words)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatus Diagnostics\u003c\/td\u003e\n\u003ctd\u003eCommunications Error Flags, Participation Flags\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; Field I\/O Density Scaling\u003c\/h3\u003e\n\u003cp\u003eThe CJ1W-SRM21 Special I\/O Unit mounts directly onto the high-velocity SYSMAC CJ1 backplane bus, transferring cyclic CompoBus\/S frame data directly to CPU memory areas without communication bottlenecks. The module expands system I\/O density by mapping up to 32 remote CompoBus\/S slave terminals across 128 or 256 discrete I\/O points. Integrated hardware diagnostic logic maintains deterministic communication timing, updating internal Participation Flags and Communications Error Flags every bus refresh cycle to detect remote node disconnections or line interference in real time.\u003c\/p\u003e\n\u003ch3\u003ePackage Contents \u0026amp; Ordering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1x Omron CJ1W-SRM21 Input Output Control Module\u003c\/li\u003e\n\u003cli\u003e1x Removable 5-pin CompoBus\/S terminal block unit\u003c\/li\u003e\n\u003cli\u003e1x Hardware specification 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\u003eSubrack Mounting:\u003c\/strong\u003e Slide the CJ1W-SRM21 onto the DIN rail adjacent to the CPU or expansion I\/O module. Secure the top and bottom slider locks to maintain solid backplane connector contact.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompoBus\/S Wiring:\u003c\/strong\u003e Connect dedicated CompoBus\/S 2-wire or 4-wire communications cable to the front 5-pin terminal block (BD H, BD L, BS+, BS-).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShielding \u0026amp; Grounding:\u003c\/strong\u003e Terminate cable braid shields to the main panel functional earth bar using 360-deg braid shield grounding clamps to maintain high-frequency noise immunity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Number Assignment:\u003c\/strong\u003e Set the rotary unit number switches on the front panel to assign the allocated Special I\/O Unit memory words before applying backplane power.\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-SRM21 module during active PLC rack operation?\u003c\/p\u003e\n\u003cp\u003eNo. Main system power to the CJ-series rack must be completely disconnected before removing or inserting the CJ1W-SRM21 module to prevent backplane bus errors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow many total CompoBus\/S Master Units can be installed on a single CJ-Series PLC system?\u003c\/p\u003e\n\u003cp\u003eA maximum of 40 CJ1W-SRM21 Master Units can be mounted across the local CPU rack and expansion subracks, subject to CPU memory and power supply limits.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat memory word allocations are required for the 256-point I\/O operating mode?\u003c\/p\u003e\n\u003cp\u003eIn 256-point mode, the module allocates 20 memory words in the Special I\/O Unit area: 8 input words, 8 output words, and 4 status diagnostic words.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow are communications errors and node disconnections reported to the CPU unit?\u003c\/p\u003e\n\u003cp\u003eThe module continuously updates hardware-level Participation Flags and Communications Error Flags mapped directly into the allocated Special I\/O status words.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat signal cable is specified for field connections to the CJ1W-SRM21 terminal block?\u003c\/p\u003e\n\u003cp\u003eUse dedicated CompoBus\/S VCTF 2-wire or 4-wire flat cable, or shielded twisted-pair cable rated for high-speed fieldbus communications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow is functional grounding established across the CJ1W-SRM21 module housing?\u003c\/p\u003e\n\u003cp\u003eGrounding is provided via internal backplane ground pins connected directly to the system power supply unit's Functional Earth (FE) terminal block.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat node address settings apply when configuring slave devices on the network?\u003c\/p\u003e\n\u003cp\u003eThe module manages node addresses across 8 addresses per mode, supporting up to 32 remote slave devices on a single CompoBus\/S trunk line.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat storage environment limits apply to spare CJ1W-SRM21 control modules?\u003c\/p\u003e\n\u003cp\u003eUninstalled spare modules must be stored in original anti-static packaging in ambient temperatures between -20 and +75 deg C in non-condensing environments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Omron","offers":[{"title":"Default Title","offer_id":47306607132845,"sku":"CJ1W-SRM21","price":130.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/CJ1W-SRM21_1.jpg?v=1788102718","url":"https:\/\/www.maxwellplc.com\/ga\/products\/omron-cj1w-srm21-input-output-control-module-sysmac-cj1-series","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}