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Receiving Explicit Messages Section 6-5
CPU Unit Status Read (Service Code: 40 Hex)
This PLC Object service reads status details (operation status, operating
mode, fatal and non-fatal errors, etc.) from the CPU Unit.
Command Block
Response Block
Parameters Destination node address (command): The node address of the CS/CJ-
series DeviceNet Unit from which to read data, specified in 1-byte (2 digit)
hexadecimal.
Service code (command, response): 40 Hex is specified for commands. For
responses, the highest bit will turn ON and C0 Hex will be returned.
Class ID (command): Always 002F Hex.
Instance ID (command): Always 0000 Hex.
No. of bytes received (response): The number of bytes received from the
destination node address (remote node) is returned in hexadecimal.
Destination node address (response): The node address of the CS/CJ-
series DeviceNet Unit that returned the response is returned in hexadecimal.
Read data (response): The read data is given in the following table. The data
is returned after the service code in the order shown in the table (high to low).
Destination node address
Service Code
Class ID
Instance ID
No. of bytes
received
Destination
node address
Service Code
Detailed status
Operation Status
RUN mode
Fatal error information (L)
Fatal error information (H)
Non-fatal error information (L)
Non-fatal error information (H)
Message exists/does not exist (L)
Message exists/does not exist (H)
Error code (L)
Error code (H)
Error message (16 bytes)