Table of Contents
Advertisement
PROFIBUS Diagnostics
3-7
PROFIBUS Diagnostics
Note
The PRT1-SCU11 provides extended diagnostics over PROFIBUS to notify
the PROFIBUS DP Master of the Unit's status and the status of the RS-422A/
RS-485 communication. These extended diagnostics are sent to the Master
unit via a PROFIBUS Diagnostics message. These messages are only sent
up on occurrence of the error or status event.
A PROFIBUS Diagnostics message will contain 6 standard diagnostics bytes,
followed by the Extended diagnostics bytes, in case any extended diagnostics
data is available. The extended diagnostics bytes as produced by the PRT1-
SCU11 are shown below.
7
Byte 1
7
Byte 2
7
Byte 3
7
Byte 4
7
Byte 5
7
Byte 6, Byte 7
7
Byte 8, Byte 9
1. Byte 1 in the figure above represents the 7th byte in a diagnostics mes-
sage. The first 6 bytes (not shown here) are standard diagnostics.
2. If a bit flag in byte 2 to 5 is ON, the corresponding device on the RS-422A/
RS-485 network is not responding or it has reported a communication er-
ror.
6
5
4
3
2
1
0
6
5
4
3
2
1
0
6
5
4
3
2
1
0
Device 09 ~ 16 Comm. error
6
5
4
3
2
1
0
Device 17 ~ 24 Comm. error
6
5
4
3
2
1
0
Device 25 ~ 31 Comm. error
6
5
4
3
2
1
0
6
5
4
3
2
1
0
Section 3-7
Block length (Bytes)
Including Header byte
Fixed to 00
Device 01 Comm. error
Device 02 Comm. error
Device 03 Comm. error
Device 04 Comm. error
Device 05 Comm. error
Device 06 Comm. error
Device 07 Comm. error
Device 08 Comm. error
Reserved
Reserved
53
Advertisement
Chapters
Table of Contents
Troubleshooting
