Industrial Automation

CJ1W-DRM21

CJ-series DeviceNet Unit

CJ1W-DRM21

Smallest in the Industry! A DeviceNet Unit for the CJ Series that Boasts Industry-leading Performance and Functions

last update: October 2, 2023

Communication Specifications

Item	Specifications
Communications protocol	DeviceNet
Connection methods	Multi-drop and T-branch connections can be combined (for trunk and branch lines) *1
Baud rate	500 Kbps, 250 Kbps, or 125 Kbps
Communications media	Special 5-wire cables (2 signal lines, 2 power lines, 1 shield line) Special 4-wire flat cables (2 signal lines, 2 power lines)
Communications distances for special 5-wire cables	Baud rate	Network length	Branch line length	Total branch line length
	500 kbps	100 m max.	6 m max.	39 m max.
	250 kbps	250 m max. *2	6 m max.	78 m max.
	125 kbps	500 m max. *2	6 m max.	156 m max.
Communications distances for special 4-wire flat cables	Baud rate	Network length	Branch line length	Total branch line length
	500 kbps	75 m max.	6 m max.	35 m max.
	250 kbps	150 m max.	6 m max.	48 m max.
	125 kbps	265 m max.	6 m max.	135 m max.
Communications power supply	24 V DC supplied externally
Max. number of nodes	64 nodes (including Masters, Slaves, and Configurator)

*1. Terminators are required at both ends of trunk line.
*2. Indicates the maximum network length when thick cables are used. Reduce the network length to 100 m max. when
using thin cables.

Network Specifications

Specifications

Communications power supply voltage				11 to 25 VDC *1
Current consumption				Communications:18 mA max. Internal circuit: 290 mA max.
Max. number of connectable slaves	Remote I/O, explicit message service			63 *2
Max. number of I/O points	Fixed allocations		When used as a master	2,048 points
	Fixed allocations		When used as a slave	32 points
	User-set allocations	Using allocated DM Area words	When used as a master	16,000 points
		Using allocated DM Area words	When used as a slave	3,200 points
		Using Configurator	When used as a master	32,000 points
		Using Configurator	When used as a slave	4,800 points
Number of allocated words	Fixed allocations		When used as a master	64 input and 64 output words Software switch/status area: 25 words
	Fixed allocations		When used as a slave	1 input word, 1 output word *3
	User-set allocations	Using allocated DM Area words	When used as a master	500 input and 500 output words Software switch/status area: 25 words
		Using allocated DM Area words	When used as a slave	100 input and 100 output words *3 Software switch/status area: 25 words
		Using Configurator	When used as a master	500 input words x 2 blocks, 500 output words x 2 blocks Software switch/Status area: 25 words
		Using Configurator	When used as a slave	100 input words x 1 blocks, 100 output words x 2 blocks *2 Software switch/Status area: 25 words
Message com- munications	Max. message length			542 bytes *4
Applicable Controllers				CJ/NJ Series
Max. number of Units mountable to Controller	Fixed allocations			3
Max. number of Units mountable to Controller	User-set allocations			16
Weight				118 g max.

*1. Refer to the DeviceNet Operation Manual (W267) for the communications power supply specifications.
*2. The Device Unit uses a node, and so connection is possible to 63 slaves only.
*3. When the DeviceNet is used as a slave, "input" and "output" respectively refer to input from the slave to the master
and output from the master to the slave.
*4. The maximum message length includes the command code when using the CMND instruction. (SendCmd instruction
with NJ-series controller)

last update: October 2, 2023

Product Category

Automation Systems
- Programmable Controllers
  - CJ1
    - CPU Bus Units

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