Failure Of A Profibus Dp Station; Malfunction When Loading The Ob - Siemens SIMOCODE pro Programming And Operating Manual

4.2.8

Failure of a PROFIBUS DP station

The PROFIBUS connection error is reported at the
as an alarm in WinCC.
Table 4- 9
Byte 0
Bit 0
4.2.9

Malfunction when loading the OB

Interrupt OB 85 sets or resets the priority class error
Table 4- 10
Fault
Error when creating a start event for an OB. This is not
loaded to the CPU.
Error when the operating system accesses a module.
GrpErr
SIMOCODE pro PCS 7 Library V9.0
Programming and Operating Manual, 06/2017, A5E40899442002A/RS-AA/001
Possible reasons for the connection error
Meaning
1: DP slave cannot be
accessed by the DP
master.
Events during which OB 85
is only triggered once for one execution cycle of the block.
output of the MMDiag block and
BusFlt
Reason or remedy
DP slave cannot be accessed by the DP master.
•
Is the station address of the DP slave set correctly?
•
Is the bus connection plug connected?
•
Is voltage applied to the DP slave?
•
Is the RS 485 Repeater secured correctly?
•
Has a reset been performed on the DP slave?
•
(malfunction when loading OBs).
GrpErr
is reset
GrpErr
Event number
16#A1, 16#A2 or
16#A3
16#B1, 16#B2
16#B3
Description of the blocks
4.2 Diagnostics block MMDiag
Event class
16#35
16#39
16#39 or 16#38
99