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Exception Code

Name

Cause

Bad function code

Function code is not supported

by the controller

Illegal data address

Illegal data value

Data value out of range or

attempt to write a read-only or

protected data

7-2 Exception Responses7-2 Exception Responses

If the controller receives a message which contains a corrupted

character (parity check error, framing error etc.), or if the CRC16 check

fails, the controller ignores the message.

However, if the controller receives a syntactically correct message

which contains an illegal value, it will send an exception response,

consisting of five bytes as follows:

slave address +offset function code + exception code + CRC16 Hi +

CRC16 Lo

Where the offset function code is obtained by adding the function

code with 128 (ie. function 3 becomes H'83), and the exception code

is equal to the value contained in the following table:

Table 7.1 Exception Code Table

7-3 Parameter Table7-3 Parameter Table

You can refer to for the parameter description. The register

address for each parameter is shown in the first column of the table.

The register 133 for EROR is the error code. The error code description

is shown in Table A.1.

The register 140 for PROG is the program code of the product. The

program code is 37.xx for P41 and 38.xx for P91 where xx denotes the

software version number. For example, PROG = 37.12 means that the

profiler is P41 with software version 12.

section 1-6section 1-6

UM0P411A

Brainchild P91 User Manual

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