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Explicit Message Communications Section 6-3
ERROR RESPONSE The CPM2C-S returns an error response when there is an error in the explicit
message command sent from the DeviceNet Master.
Response Format
Parameters
Number of bytes received (response)
Indicates the number of bytes of data (in hexadecimal) from the “source node
number.”
Source node number (response)
Indicates the node number (in hexadecimal) of the CPM2C-S that returned
the response.
General error code (response)
Indicates the nature of the error with one of the 1-byte (2-digit hexadecimal)
error codes listed in the following table.
Additional error code (response)
Always FF (Hex).
6-3-3 Examples of DeviceNet Explicit Messages
CS/CJ, CVM1, and CV-series PCs: Reading Data with CMND(194)
This example shows the instruction operands and results when 20 words of
data (IR 010 to IR029) in a Slave are read through a Master mounted in a CS/
CJ, CVM1 or CV-series PC.
For details on explicit messages, refer to the CS/CJ Series DeviceNet Units
Operation Manual (W380) for CS/CJ-series PCs, and refer to the DeviceNet
Operation Manual (W267) for CVM1 and CV-series PCs. For details on
CMND(194), refer to the CS Series Programmable Controllers Operation
Manual (W339) for CS-series PCs, and refer to the CVM1/CV Series CV500/
CV1000/CV2000/CVM1 Programmable Controllers Operation Manual: Ladder
Diagrams
(W202) for CVM1 and CV-series PCs.
Example Network
Conditions Master’s node number: 63
Slave’s network address: 1
Slave’s node number:
2
Code Error name Meaning
08 (Hex) Service not supported The service code was invalid.
15 (Hex) Too much data There was too much data. (For example, the
amount of write data exceeded the data area
boundary.)
13 (Hex) Not enough data There was too little data. (For example, an odd
number of bytes of write data were used in a
WRITE WORD DATA command.)
20 (Hex) Invalid parameter The starting word address was invalid.
11 (Hex) Reply data too large The data area boundary was exceeded in a
DATA READ command.
16 (Hex) Object does not exist The class ID or instance ID was invalid.
Number of bytes received
Source node number
General error code
Additional error code
(Always FF)