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Sending Explicit Messages Section 6-4
Parameters Destination node address (command): The node address of the destination
of the explicit message. (The node address of the local DeviceNet Unit is
specified in the control data for the CMND(490) or IOWR instruction, but the
node address of the actual destination is specified here in the FINS com-
mand.)
Service code (command, response): A service code defined for DeviceNet.
In a normal response, bit 15 of the service code specified in the command will
be turned ON and returned. In an error response, 94 Hex will always be
returned.
Class ID (command): The class ID of the destination of the explicit message.
Instance ID (command): The instance ID of the destination of the explicit
message.
Service data (command, response): The data defined for the services
codes.
No. of bytes received (response): The number of bytes received from the
destination node address (remote node).
Destination node address (remote node): The node address of the
OMRON Special I/O Slave Unit or Slave manufactured by another company to
which the explicit message was sent is returned.
Error code (response): An error code defined by DeviceNet.
Note 1. This command sends a DeviceNet-defined explicit message to an OMRON
Special I/O Slave Unit or a Slave manufactured by another company and
receives a response.
2. Unlike other FINS commands, this command is addressed to the local De-
viceNet Unit. The actual destination of the explicit message is given in the
command data, as described above.
3. If the DeviceNet Unit receives an explicit message, it will automatically re-
turn a response.
4. Refer to the DeviceNet Specification for details on parameters for explicit
messages.
5. Contact the Open DeviceNet Vendor Association, Inc. (ODVA) at 8222
Wiles Road, Suite 287, Coral Springs, FL 33067 USA (phone: 954-340-
5412, fax: 954-340-5413, e-mail: billmoss@ix.netcom.com, Home page:
http://www.odva.org/) to obtain copies of the specification.
6. For details on explicit messages to OMRON Special I/O Slaves, refer to the
CompoBus/D (DeviceNet) Slaves Operation Manual (W347).
6-4-2 Sending Explicit Messages Using CMND(490)
CMND(490) can be used in the CPU Unit ladder program of the CS/CJ-series
DeviceNet Unit to send explicit messages.
FINS command headers are attached to the explicit messages and sent.
After the FINS command header and the FINS completion code are sent, the
explicit message response is received.
The following command is used: [ CMND S D C ]
S: First command word
0128
Response
code
Command
code