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Explicit Message Communications
Section 6-3
Explicit Message List
Note
1.
When sending explicit message commands, the range of data specified by
the data area, starting address, and number of bytes must not exceed the
range of the CPM2C-S data area.
2.
Use the READ BYTE DATA and WRITE BYTE DATA commands when
sending explicit message commands from an OMRON DeviceNet Master.
Use the READ WORD DATA and WRITE WORD DATA commands when
sending explicit message commands from another company’s DeviceNet
Master.
3.
The number of bytes occupied by the “Class ID” and “Instance ID” param-
eters varies from Master to Master. These parameters are specified in 2
bytes (4 digits) in commands sent from OMRON DeviceNet Masters. (CV-
series PCs use the CMND instruction and C200HX/HG/HE PCs use the
IOWR instruction.)
6-3-2
Command and Response Formats
READ BYTE DATA
Reads the specified node’s data in byte-units from the DeviceNet Master.
When word data is being read, the leftmost byte is read before the rightmost
byte. Up to 200 bytes can be read at one time.
Command Format
Explicit message
Function
Page
READ BYTE DATA
Reads the specified node’s data in byte-units from
the DeviceNet Master. When word data is being
read, the leftmost byte is read before the rightmost
byte. Up to 200 bytes can be read at one time.
WRITE BYTE DATA
Writes data from the DeviceNet Master to the speci-
fied node’s data area in byte-units. When word data
is being written, the leftmost byte is written before
the rightmost byte. Up to 200 bytes can be written at
one time.
READ WORD DATA
Reads the specified node’s data in word-units (two-
byte units) from the DeviceNet Master. When word
data is being read, the leftmost byte is read before
the rightmost byte. Up to 100 words can be read at
one time.
WRITE WORD DATA
Writes data from the DeviceNet Master to the speci-
fied node’s data area in word-units (two-byte units).
When word data is being written, the leftmost byte is
written before the rightmost byte. Up to 100 words
can be written at one time.
ERROR RESPONSE
The CPM2C-S returns an error response when
there is an error in the explicit message command
sent from the DeviceNet Master.
Destination node number
Service code
Class ID
Instance ID
Address L
Address H
Number of bytes
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