Siemens SPC3 Specifications download pdf (Page 30)

Introduction To ProfiBus DP

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Device-Related Diagnostic Example:

Byte

76543210

0 0 0 1 0 1 Device Related Diagnostic,

5 bytes (Header + 4bytes)

2 XXXXXXXX

Code As Desired

3 XXXXXXXX

Code As Desired

4 XXXXXXXX

Code As Desired

5 XXXXXXXX

Code As Desired

Identifier-Related Diagnostic (For Modular Systems)

This diagnostic structure is based on a modular system, where each

module has one identifier (configuration byte). Thus, a defective or faulty

module can be easily detected and no additional description necessary. One

bit is reserved for every identifier byte specified in the configuration (e.g. 0 x

10 for 1-byte input). A set bit in a bit position means that this I/O diagnostic

is pending. Bits not configured are set to 0 and bytes are padded to the byte

limits. When modular systems with one identifier byte per module are

involved, you can indicate diagnostics by specific module. One bit per

module indicates the diagnosis.

Identifier-Related Diagnostic Byte 1 of X – Header Byte

76543210

XXXXXX

Bits 7,6 = 01 Bits 5-0 = Block Length in bytes including header byte 2

to header byte 63.

Identifier-Related Diagnostic Byte 2 of X – Bit Structure

76543210

XXXXXXXX

A set bit in a bit position means that the corresponding identifier byte has

the diagnostic..

Identifier-Related Diagnostic Example:

Byte

76543210

0 0 0 1 0 1 Identifier Related

Diagnostic, 5 bytes

(Header + 4bytes)

2 00000001

Identifier Number 0

(Module 1) Has Diagnostic

3 00100000

Identifier Number 13

(Module 14) Has

Diagnostic

4 00000010

Identifier Number 18

(Module 19) Has

Diagnostic.

5 00001000

Identifier Number 28

(Module 29) Has

Diagnostic.

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Siemens SPC3 Specifications Page 30

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