6 DeviceNet Communications
6.8.3 Sending Explicit Messages Using the CMND Instruction
6-68
6
Note 1.
The Explicit Message Send 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, the Explicit Message Send command specifies the local node
DeviceNet Master Unit as the CMND instruction control code destination. The actual
destination node is specified using the destination node address in the Explicit Message Send
command.
Always specify the local node DeviceNet Master Unit in the CMND instruction control code. If
another node Master Unit is specified, an error will occur.
3.
If the DeviceNet Master Unit receives an Explicit Message, it will automatically return a
response.
6.8.3 Sending Explicit Messages Using the CMND Instruction
This section explains how to use the CMND (command sending) instruction to send Explicit
Messages, including the timing of message execution and responses.
CMND
With the CS/CJ-series DeviceNet Master Unit, CMND instructions can be used in the CPU
Unit’s ladder program to send Explicit Messages.
The Explicit Message command data is sent with FINS command code 2801 Hex attached at
the beginning.
The Explicit Message response is received following the FINS command code 2801 Hex
and FINS completion code.
S: First Command Word at Local Node
Specify the beginning word for the command data to be transferred to the DeviceNet Master
Unit. Preset in consecutive words the data to be transferred, as shown below.
(@)CMND(490)
S
D
C
Word
Bits
15 to 8
7 to 0
S
Command code (Set Explicit Message FINS command 2801.)
S+1
Node address of slave or master to which
message is to be sent:
0 to 3F Hex (0 to 63)
Explicit Message service code
Write: 10; Read: 0E
S+2
Class ID code (Sets the DeviceNet class code for the function.)
S+3
Instance ID code (Sets the DeviceNet instance code for the function.)
S+4
Attribute ID code (Sets the DeviceNet
attribute code for the function.)
Attached data (for write)
---
Attached data (for write)
Summary of Contents for OMNUC W R88A-NCW152-DRT
Page 1: ...Cat No I538 E3 1 DeviceNet Option Unit OMNUC W Series Model R88A NCW152 DRT...
Page 53: ...4 Connectors 4 5 3 DeviceNet Network Configuration Restrictions 4 22 4...
Page 97: ...5 Parameter Settings 5 3 8 Notch Signal Output Positioning 5 44 5...
Page 211: ...8 Servo Driver Settings 8 5 3 Absolute Encoder Multi turn Limit Setting 8 24 8...
Page 257: ...9 Troubleshooting 9 46 9...