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2 Simple Application Controllers
The Command String 7
7 - 14
7.3.11 Error Codes
If there is a problem in the communication line or in the command string, the
α
2 controller will
return an error message. The error message will follow an NAK reply as shown below.
Table 7.10: Error Codes for Format “A” Transmissions
Code Error Error Description
01H Sum Check error There is an error in the Sum Check value used in Protocol Format “B”.
02H Protocol error
There is a discrepancy in the number of communication bytes in the
message.
Command for READ, WRITE or RUN/STOP operation is incorrect.
03H Device error
The data stored in the device specification is outside the device
range.
The Device Status setting value in out of the intended devices’s range
The write protection for the memory cassette is enabled.
04H Remote error
There is a problem in the remote Start/Stop operation. Usually the
cause of this error is an error in the controller program.
05H Date/Time error The Date or Time is invalid.