Siemens SPC3 Specifications download pdf (Page 31)

Introduction To ProfiBus DP

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Channel-Related Diagnostic

This diagnostic structure is used for pre-defined failure types with specific

identifiers used to identify the specific faults. Fault definitions can be defined

per module and per channel. Additional device-specific definitions are also

possible. In this block beginning at DU byte 7, the diagnosed channels and

diagnostic reasons are entered in sequence, one at a time, with 3 bytes per

diagnostic entry according to the following format:

Channel Related Diagnostic Byte 1 of 3 – Identifier Number

76543210

XXXXXX

Bits 7,6 = 10 Bits 5-0 = Identifier Number, 0 to 63

Channel Related Diagnostic Byte 2 of 3 – Channel Number

76543210

XXXXXXXX

Bits 7,6 = Input/

Output Coding:

00=Reserved

01=Input

10=Output

11=Input/Output

Bits 5-0 = Channel Number, 0 to 63

Channel Related Diagnostic Byte 3 of 3 – Error Type

76543210

XXXXXXXX

Channel Type:

000 = Reserved

001 = Bit

010 = 2 Bit

011 = 4 Bit

100 = Byte

101 = Word

110 = 2 Words

111 = Reserved

Error Type:

0 = Reserved

1 = Short Circuit

2 = Under-voltage

3 = Over-voltage

4 = Overload

5 = Over-temperature

6 = Line/wire Break

7 = Upper Limit Value Exceeded

8 = Lower Limit Value Exceeded

9 = Error

10..15 = Reserved

16..31 = Manufacturer Specific/Device Related

If a slave transmits more diagnostic data than the master is able to

process in its diagnostic buffer, the master sets the Diag.Ext_Diag_Overflow

bit. If there is more diagnostic information pending at the slave than can be

transmitted, the slave is only allowed to truncate at the block limits of the

device, identifier, or channel related diagnostic. Further, if the block length

field of the device or identifier related diagnostic contains a non-zero length,

this marks a complete (not truncated) diagnostic block. For the sake of

efficiency, the slave is allowed to transmit a Diag_Data field of fixed length

(the unused bytes following Ext_Diag_Data are filled with zero at the slave

and/or class 1 master).

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Siemens SPC3 Specifications Page 31

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