7-2
Section
Using Message Communications
87
Always specify the local node’s DeviceNet Master Unit in the control code of
the CMND or IOWR instruction. An error will occur if another node’s Master
Unit is specified.
2. If the DeviceNet Master Unit receives an explicit message, it will automati-
cally return a response.
Reference Refer to 7-3 Explicit Messages for details on the service code, class ID, instance
ID, and service data to use when sending an explicit message to the DeviceNet
Master Unit.
7-2-2 Using the CMND Instruction in CVM1 and CV-series PCs
Use the CMND instruction when sending explicit messages from a CVM1/CV-
series PC.
Reference The DeviceNet Master Unit must be registered in the routing table (local network
table) of the CVM1 or CV-series PC to execute the CMND(194) instruction from
the PC.
The local network table of the routing tables lists the unit numbers of the Com-
munications Units mounted to the PC and the addresses of the Networks to
which each Unit belongs. An example local network table is shown below.
Unit #04
Unit #05
Unit #06
Unit #07
Network 1
Network 2
Network 3
Network 4
Address of local
network
CPU Bus Unit’s
unit number
001
04
002
05
003
06
004
07
The unit number of the DeviceNet Master Unit as a CPU Bus Unit is the number
set on the rotary switches on the front panel. The network address is the address
of the Network to which the CPU Bus Unit is connected.
Routing tables are set from the Support Software using the following display to
input the settings.
