Technical data

DPV1 SFBs According to PNO AK 1131
System Software for S7-300/400 System and Standard Functions - Volume 1/2
A5E00709327-01
8-25
Effect of the SFB75 call on the module status information and the group error
LED (SF)
As for any CPU, the slot properties for an intelligent slave are stored in the module
status information (see SSL-ID W#16#xy91 - Module Status Information)
When you use SFB 75 to send a diagnostic interrupt, the operating system at the
intelligent slave influences the slave-local module status information and the SF
LED based on bit 0 in byte 0 in AINFO (this bit is added to the status information as
"module fault"). However, there is no diagnostic buffer entry made at the I slave,
and no diagnostic interrupt OB is started.
Consistency of module status information between DP master and I slave
The following section presents different scenarios and discusses their effects on
module status information:
• Station return (results in start of OB 86 at DP master and at I slave)
This has an effect on the module status information at the I slave and at the S7
master ("Module fault" is reset.). If, after a station return, there are faults at the I
slave from the point of view of the user, these must be reported to the DP
master by means of an SFB 75 call.
• STOP-RUN operating mode transition at the DP master (results in start of OB
82 at I slave)
The module status information at the I slave remains unchanged. The DP
master resets the "module fault" bit in the relevant module status information.
To ensure consistency of the module status information between the DP master
and the I slave in S7- compatible mode, you must react at the I slave as follows:
- For each error-free virtual slot, use SFB 75 to send an outgoing diagnostic
interrupt to the DP master.
- For each faulty virtual slot, use SFB 75 to send an incoming diagnostic
interrupt to the DP master.
• STOP-RUN operating mode transition at the I slave (results in start of OB 82 at
DP master)
The module status information at the DP master remains unchanged; the
information at the I slave is reset ("Module fault" is reset.).
To ensure consistency of the module status information between the DP master
and the I slave in S7-compatible mode, you must react at the I slave as follows:
- For each error-free virtual slot, use SFB 75 to send an outgoing diagnostic
interrupt to the DP master.
- For each faulty virtual slot, use SFB 75 to send an incoming diagnostic
interrupt to the DP master.
Note
Since SFB 75 functions asynchronously, the SFB 75 calls cannot be ended in the
startup OBs. In other words, they must be run in the cyclical program until they are
finished.