24: R
EMOTE
I/O S
YSTEM
24-22
O
PEN
N
ET
C
ONTROLLER
U
SER
’
S
M
ANUAL
Error Codes for Remote Bus and Local Bus Errors
The Add_Error_Info provides the coded error location for remote or local bus errors. The exact error position is only indi-
cated if no interface error occurred. In the case of an interface error, the defective bus segment will be indicated. Bit 7 indi-
cates whether an interface error occurred. The meanings of bits 0 to 6 will also change. This results in three different states
which have the following bit combinations in the Add_Error_Info.
Bus segment in which
the error occurred
Add_Error_Info
Bit 7 = 0
No inter face error occurred
Position of the located error
Bus segment in which
the error occurred
Add_Error_Info
Bit 7 = 1
An inter face error occurred
Bit 1-6 = 0
Bit 0 = 0
Error at the outgoing
remote bus inter face
Bus segment in which
the error occurred
Add_Error_Info
Bit 7 = 1
An inter face error occurred
Bit 1-6 = 0
Bit 0 = 1
Error at the outgoing
local bus inter face
7
6
5
4
3
2
1
0
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
15 14 13 12 11 10 9
8
Error at the outgoing remote bus interface
No interface error occurred
Error at the outgoing local bus interface
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