Omron CRT1 - 10-2009, Operation Manual

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Appendix A
CompoNet Explicit Messages
CompoNet explicit messages sent from the CompoNet Master Unit to a CompoNet Slave Unit can be used to
read or write any parameter of the specified Slave Unit.
The CompoNet Slave Units process the commands sent from the Master Unit and then return responses.
Sending Explicit Messages by FINS Commands
FINS commands are used to send CompoNet explicit messages from a CS/CJ-series CompoNet Master Unit.
For details on FINS commands, refer to the
SYSMAC CS/CJ/CP-series and SYSMAC One NSJ-series Com-
munications Commands Reference Manual (Cat. No. W342).
Message Flow
FINS commands are sent by using the CX-Programmer's CMND instruction. When a FINS command is sent
from the CPU Unit to the CompoNet Master Unit, the CompoNet Master Unit converts the FINS command to a
CompoNet explicit message and sends it to a CompoNet Slave Unit. The response from the Slave Unit is then
converted by the Master Unit from a CompoNet explicit message to a FINS response and sent back to the CPU
Unit.
FINS Format
The FINS command code of 2802 hex is used to send CompoNet explicit messages.
Command Format
Response Format
• When a Normal Response Is Returned for a CompoNet Explicit Message
• When an Error Response Is Returned for a CompoNet Explicit Message (CompoNet Explicit Message
Communications Error)
CPU Unit
CMND
instruction
(See note.)
FINS response
FINS
header
Response FINS
header
Response
CompoNet Network
FINS
header
Explicit
message
CompoNet Slave Unit
CompoNet Master Unit
FINS
header
FINS command
Explicit
message
Note: The command code
for the FINS
command is 2802.
28 02
Service Code Class ID Instance ID Service Data
532 bytes max.
Destination node address
Command
code
28 02 00 00 532 bytes max.
Service Code Service Data
Command
code
End code
Number
of bytes
received
Destination node address