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Siemens Simatic S7-400 User Manual

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Diagnostic Data of the Signal Modules

B-3

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

B.2

Structure and Contents of

Diagnostic Data Bytes 0 and 1

The structure and contents of the different bytes of the diagnostic data are
described below. The following general rule applies: When an error occurs, the bit
concerned is set to ”1”.

Bytes 0 and 1

Byte 0

7 6

0

Module malfunction

Internal malfunction

External malfunction

There is a channel error

No external auxiliary supply

Front connector missing

Module not parameterized.

Incorrect parameter in the module

5 4 3 2 1

Byte 1

7 6

0

Channel information available

5 4 3 2 1

Module type (see Table B-1)

0

0

0

Figure B-1

Bytes 0 and 1 of the Diagnostic Data

Module Types

The following table contains the IDs of the module classes (bits 0 to 3 in byte 1).

Table B-1

Codes of the Module Types

Code

Module Type

0101

Analog module

0110

CPU

1000

Function module

1100

CP

1111

Digital module

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