Sending Explicit Messages - Omron CS1W-DRM21 Operation Manual

Sending Explicit Messages

6-4-1 Sending Explicit Messages
CPU Unit
CMND
(490)
162
The FINS command code 28 01 can be used to send explicit DeviceNet mes-
sages to OMRON slaves and DeviceNet devices made by other manufactur-
ers. The use of explicit messages is illustrated in the following diagram.
Explicit
FINS
message
header
Use 28 01 for the
FINS command code.
FINS Response
header
The local DeviceNet Unit is specified as the destination in the communica-
tions instruction in the PLC's user program (not the OMRON Special Slave or
DeviceNet device made by another manufacturer), and the node address of
the actual destination (i.e., the Slave or Master made by another manufac-
turer) is specified in the command data for the explicit message send com-
mand.
FINS command
PLC's
CPU Unit
Explicit message
Slave or Master
not by OMRON
DeviceNet Unit
FINS
header
FINS
header
CMND
Control data in C+3
Destination node address:
Destination unit address:
Section 6-4
Slave or Master
by other
manufacturer
Explicit
message
DeviceNet
network
Response
Local node address
Unit No. of DeviceNet Unit +10 (Hex)