1-11
1 Features and System Configuration
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
1-2 Specifications
1
1-2-1 DeviceNet Unit
Data stored in non-volatile memory (EEPROM) in the
DeviceNet Unit
Saves the following data settings (same as the Backup file on the SD
Memory Card).
• Master scan list
• Slave scan list
• Message monitoring timer list (monitoring time for explicit message
responses)
• Communications cycle time settings
• Master/Slave enabled
Applicable connections The DeviceNet Unit automatically selects the applicable connection. The
user can also specify poll, bit-strobe, COS (change of state) or cyclic for
the applicable connection of each slave with the use of the CX-Integra-
tor. You can set up to two types of connections for each Slave (although
COS and cyclic cannot be specified simultaneously).
Communications cycle time Uses values by default are calculated by the following equations.
Example: 16 Input Slaves (16 points each), 16 Output Slaves (16 points
each), and a baud rate of 500 Kbit/s: 9.3 ms
The user can set a value within a range from 2 to 500 ms. However, the
calculated value is enabled when the calculated value from the condi-
tions equation is greater than the setting.
Note Uses default values calculated in the way that even missing nodes
are cosidered 1 input word 1 output word when the scan list is dis-
abled.
Message
communica-
tions
Max. No. of nodes for message communica-
tions per DeviceNet Unit
Send explicit messages 63 nodes
Execution instructions Any commands SendCmd instruction
Inter–network communica-
tions
Same type
of network
Allows transmission across the same type of networks between
DeviceNet networks when multiple Units are mounted (can cross up to
three levels).
Different
type of net-
work
Allows transmission across different types of networks between
DeviceNet and other networks (e.g., Controller Link and Ethernet/IP)
(can cross up to three levels).
Other func-
tions
SD Memory Card Backup function Allows DeviceNet Unit setup data (scan list, communications cycle time
settings, etc.) to be backed up as a file to a SD Memory Card in the CPU
Unit. You can also read (i.e., restore) the setup data from the SD Mem-
ory Card to the DeviceNet Unit.
Data setup file can be restored into a DeviceNet Unit simply by carrying
the SD Memory Card to the site if the device parameter file prepared
from the CX-Integrator is saved to SD Memory Card from a personal
computer.
Error history in the DeviceNet Unit Supported (You can access the history with the CX-Integrator).
Communications cycle time setting Supported (in the device variable for CJ-series Unit or from the CX-Inte-
grator).
Message monitoring timer Sets the response monitoring time (explicit connection opening inter-
val) in the DeviceNet Unit for explicit message communications. You
can make settings separately for all targeted devices with the use of the
CX-Integrator.
COS/cyclic heartbeat timer setting Sets the minimum SEND interval in COS or cyclic connections for all tar-
geted devices. The setting is made using the CX-Integrator.
Device data check function Performs a comparison check on the following device data when slave
data registered in the scan list is compared with actual slave data. You
can use the CX-Integrator to set this function for all targeted Slaves.
Vendor, device type and product code
CX-Integrator connection method Built-in EtherNet/IP port on CPU Unit or peripheral (USB) port
Setting section Rotary switches:
Unit No. (hexadecimal x 1), node address (decimal x 2)
Front panel DIP switch: Baud rate, stop or continue communications
when an error occurs
Item Specifications
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