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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

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

CJ1W-DRM21 Specifications 3

Specifications

Communications power supply voltage 11 to 25 VDC
Current consumption Communications:18 mA max.
Internal circuit: 290 mA max.
Max. number
of connectable
slaves
Remote I/O, explicit message service 63 *1
Max. number
of I/O points
Fixed allocations When used
as a master
2,048 points
When used
as a slave
32 points
User-set
allocations
Using
allocated
DM Area
words
When used
as a master
16,000 points
When used
as a slave
3,200 points
Using
Configurator
When used
as a master
32,000 points
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
When used
as a slave
1 input word, 1 output word *2
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
When used
as a slave
100 input and 100 output words *2
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
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 *3
Applicable Controllers CJ/NJ Series
Max. number
of Units
mountable to
Controller
Fixed allocations 3
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)