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PROFIBUS general -- Configuring and programming communication -- Using communication blocks
Transfer of analog values from and to the PROFIBUS DP slave
Which entries deal with consistent data in conjunction with distributed I/O?
How can you access consistent data without SFC14/15 as part of the process image?
Why does my new CPU 315-2DP (Order No: 6ES7 315-2AG10-0AB0) not process the SFC13 correctly?
How do you receive an alarm with the SFB 54 "RALRM" in compliance with DPV1?
DP slave lifelist using SFC51 "RDSYSST" instead of SFC12 "D_ACT_DP"
Can you use the "Signal System Error" function, the FB126 function block and the SFC13 "DPNRM_DG" system function simultaneously?
Notes for the use of the system function SFC12 "D_ACT_DP"
What is consistent data?
How do you read data consistently from a DP standard slave/PROFINET IO device and write it consistently to a DP standard slave/PROFINET IO device?
Disabling DP slaves after startup of the CPU
Diagnostics information of the FB125 with disabled DP slave
Enabling a disabled DP slave with SFC 12 "D_ACT_DP"
Parameter assignment of SFC 103 / SFC 59 required for identifying and reading out topology data
What are the requirements for using the "Prepare cable diagnostics" function?
Enabling a disabled DP slave with SFC 12 "D_ACT_DP"
Part number:

QUESTION:  
What happens when with SFC 12 I enable a disabled DP slave that is physically separated from the DP bus?

ANSWER:  
If you attempt to use SFC 12 "D_ACT_DP" to enable a disabled DP slave that is physically separated from the DP bus, for about 1 minute SFC 12 delivers the error code W#16#7002 with BUSY bit 1, to indicate that the enable job is still being processed. After about 1 minute RET_VAL delivers the value W#16#80A2 for about one CPU cycle. This indicates that the DP slave addressed is not responding. The DP slave remains disabled after this procedure. The BF LED of the associated DP master remains off during this procedure.

Note:
If the DP slave is later connected to the DP bus and is to be enabled, you must trigger SFC 12 again.

More information on the behavior of SFC 12 is available in the Online Help of STEP 7 or in the manual "System Software for S7-300/400 System and Standard Functions" in Entry ID: 1214574.


 Entry ID:19730984   Date:2004-11-23 
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