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Receiving Explicit Messages Section 9-2
Note The codes for the above modes are 1-word (2-byte) data and are returned in
low byte first. For example, for PROGRAM mode, the code is returned as 01
Hex followed by 00 Hex.
• CPU Unit Errors (when Attribute ID = 65 Hex)
The CPU Unit fatal/non-fatal error data is returned in 1-word (2-byte) hexa-
decimal format, as follows:
01 Hex: Error; 00 Hex: No error.
• CPU Unit Model (when Attribute ID = 66 Hex)
The CPU Unit model is returned in ASCII.
Size: 2 bytes (Always 1400 Hex) + Model: 20 bytes (fixed). Unused area is
filled with 20 Hex (spaces) and returned.
CPU Unit Write (Service Code: 10 Hex)
This PLC Object service writes CPU Unit information, including the operating
mode and clearing errors.
Command Block
Note A body format of either 8 bits or 16 bits is possible.
Response Block
Parameters Service code (command, response): 10 Hex is specified for commands. For
responses, the highest bit will turn ON and 90E Hex will be returned.
Class ID (command): Always C4 (2F).
The class ID depends on the unit version. The class ID is C4 for unit version
2.0, and 2F for unit version 1.0.
Instance ID (command): Always 00 Hex.
Attribute ID (command): Information to write is specified by the attribute ID.
The attribute IDs are listed in the following table.
1: Error
20 bytes
Byte Byte Byte Byte Byte
Unit name
00
(*)
10
C4
(2F)
(*)
Class ID
Attribute ID
Instance ID
Service Code
Attribute Value
The class ID depends on the unit version.
Version 2.0: The class ID is C4.
Version 1.0: The class ID is 2F.
Service Code
90
Attribute ID (Hex) Contents Attribute value size
64 CPU Unit operating mode 1 word (2 bytes)
65 CPU Unit errors 1 word (2 bytes)