OB86.pdf

Organization Blocks

System Software for S7-300/400 System and Standard Functions - Volume 1/2

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1.22 Rack Failure Organization Block (OB86)

Description

The operating system of the CPU calls OB86 whenever the failure of a central

expansion rack (not with S7-300), a DP master system, or a station is detected in

the distributed I/Os (PROFIBUS DP or PROFINET IO) (both when entering and

outgoing event).

If OB86 has not been programmed, the CPU changes to the STOP mode when this

type of error is detected.

You can disable or delay and re-enable OB86 using SFCs 39 to 42.

Local Data for the Rack Failure OB

The following table describes the temporary (TEMP) variables for the rack failure

OB. The variable names are the default names of OB86.

Variable Type Description

OB86_EV_CLASS BYTE Event class and identifiers:

B#16#38: outgoing event

B#16#39: incoming event

OB86_FLT_ID BYTE Error code:

(possible values: B#16#C1, B#16#C2, B#16#C3,

B#16#C4, B#16#C5, B#16#C6, B#16#C7, B#16#C8,

B#16#CA, B#16#CB, B#16#CC, B#16#CD, B#16#CE)

OB86_PRIORITY BYTE Priority class; can be assigned via STEP 7 (hardware

configuration)

OB86_OB_NUMBR BYTE OB number (86)

OB86_RESERVED_1 BYTE Reserved

OB86_RESERVED_2 BYTE Reserved

OB86_MDL_ADDR WORD Depends on the error code

OB86_RACKS_FLTD Array [0 ..31]

of BOOL

Depends on the error code

OB86_DATE_TIME DATE_AND_TIME DATE_AND_TIME of day when the OB was called

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If you want to program OB86 dependent on the possible error codes, we

recommend that you organize the local variables as follows:

Variable Type

OB86_EV_CLASS BYTE

OB86_FLT_ID BYTE

OB86_PRIORITY BYTE

OB86_OB_NUMBR BYTE

OB86_RESERVED_1 BYTE

OB86_RESERVED_2 BYTE

OB86_MDL_ADDR WORD

OB86_Z23 DWORD

OB86_DATE_TIME DATE_AND_TIME

The following table show the event started OB86:

OB86_EV_CLASS OB86_FLT_ID Meaning

B#16#39 B#16#C1 Expansion rack failure

OB86_MDL_ADDR: Logical base address of the IM

OB86_Z23: Contains one bit for each possible expansion rack:

Each expansion rack that caused a call of OB86 is reported as

having failed (the respective bits are set). Expansion racks that

previously failed are no longer shown.

- Bit 0: always 0

- Bit 1: 1st expansion rack

- :


- Bit 22 to 29: always 0

- Bit 30: Failure of at least one expansion rack in the

SIMATIC S5 area

- Bit 31: always 0

B#16#38 B#16#C1 Expansion rack operational again

OB86_MDL_ADDR as for OB86_FLT_ID=B#16#C1. The

expansion racks that are operational again are reported in

OB86_Z23 (the respective bits are set).

B#16#38 B#16#C2 Expansion rack operational again (expansion rack failure with

discrepancy between expected and actual configuration)


OB86_Z23: Contains one bit for every possible expansion

rack, see OB86_FLT_ID B#16#C1.

Meaning of the set bit: in the affected expansion rack:

- Modules with an incorrect type ID exist

- Configured modules missing

- At least one module is defective.

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B#16#39 B#16#C3 Distributed I/O devices: failure of a DP master system

Only incoming event causes the start of OB 86, with error code

B#16#C3. An outgoing event starts OB 86 with error code

B#16#C4 and event class B#16#38:

The return of every DP slave station starts OB86

OB86_MDL_ADDR: Logical base address of the DP master

OB86_Z23: DP master ID:

- Bit 0 to 7: Reserved

- Bit 8 to 15: DP master system ID


B#16#39/B#16#38 B#16#C4 Failure of a DP station


OB86_Z23: Address of the affected DP slave:

- Bit 0 to 7: No. of the DP station


- Bit 16 to 30: logical base address of an S7 slave or

diagnostic address of a standard DP slave

- Bit 31: I/O identifier

B#16#39/B#16#38 B#16#C5 Fault in a DP station

OB86_MDL_ADDR and OB86_Z23 as for FLT_ID=B#16#C4

B#16#38 B#16#C6 Expansion rack operational again, but still and error with module

parameters.


OB86_Z23: contains a bit for each possible expansion rack:

- Bit 0: always 0


- :



- Bit 31: always 0

Meaning when bit set (in expansion rack concerned):

- Modules with incorrect type identifiers exist

- Modules with missing or incorrect parameters exist.

B#16#38 B#16#C7 Return of a DP station, but error in module parameter assignment


Address of the DP slave affected:



- Bit 16 to 30: Logical base address of the DP slave


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B#16#38 B#16#C8 Return of a DP station, however discrepancy in configured and

actual configuration


OB86_Z23: Address of the affected DP slave:



- Bit 16 to 30: Logical base address of the DP slave


B#16#39 B#16#CA PROFINET IO system failure

OB86_MDL_ADDR: logical base address of the IO controller

OB86_Z23:

- Bit 0 to 10: 0 (station number)

- Bit 11 to 14: IO system ID

- Bit 15: 1

- Bit 16 to 31: 0

B#16#39/38 B#16#CB PROFINET IO station failure/station return

OB86_RESERVED_1:

- B#16#C4: no other station is faulty

- B#16#CF: other stations have failed/are faulty


OB86_Z23:

- Bit 0 to 10: Station number


- Bit 15: 1

- Bit 16 to 30: Logical base address of the station


B#16#39/38 B#16#CC PROFINET IO station faulty/station fault corrected

OB86_RESERVED_1:

- B#16#C4: no other station is faulty

- B#16#CF: other stations have failed/are faulty


OB86_Z23:



- Bit 15: 1



B#16#38 B#16#CD PROFINET IO station return, actual configuration does not march

expected configuration


OB86_Z23:



- Bit 15: 1



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B#16#38 B#16#CE PROFINET IO station return, error in module configuration

parameters


OB86_Z23:

- Bit 0 to 10: Device number


- Bit 15: 1



Note

If you are using a DPV1 capable CPU you can obtain additional information on the

interrupt with the help of SFB54 "RALRM" which exceeds the start information of

the OB. This also applies when you operate the DP master in S7 compatible mode.

OB86.pdf

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