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S7-300 CPU 31x -- Configuring and programming communication -- Configuring the PROFIBUS interface
How do you activate the "Prioritized OCM communication" function to improve the OP communication performance?
How do you configure a connection between WinCC flexible Runtime (PC/Panel) and a SIMATIC S7-300/S7400 via PROFIBUS/MPI?
What differences are there when configuring S7 connections?
Transfer of analog values from and to the PROFIBUS DP slave
What should you pay attention to when operating a DP slave temporarily on a PROFIBUS DP network?
How do you configure an S7 connection via MPI with the SIMATIC NET OPC server and the SIMATIC NET PC software?
How do you configure a PC station as DP slave for connecting an S7 station (as DP master) for the SIMATIC NET OPC server with the SIMATIC NET PC software?
What are the differences between the integrated DP interface of a CPU (e.g. CPU 315-2 DP) and the DP interface of the CP 342-5?
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?
What are the options for exchanging data between CPUs via MPI/PROFIBUS DP?
Direct data exchange (internode communication) between two CPU modules
S7 routing via PROFIBUS with S7-300
Rules for accessing the CPU 315-2 DP on distributed I/O (integrated DP interface of CPU 315-2 DP)
Startup of the S7-300 CPUs when slave is not available
Routing with compact CPU and C7-635 as DP slave
How can you tell whether your S7-300/400 master supports DPV1 functions?
Startup of the S7-300 CPUs when slave is not available
Part number:

QUESTION:  
What is the monitoring time for a S7-300 CPU on the PROFIBUS when a DP slave is not available?

ANSWER:  
You are operating a PROFIBUS network with DP slaves on the PROFIBUS interface of your CPU and during Startup you wish to check whether the expected configuration matches the actual configuration. There are two different times given in the Properties dialog of the CPU, in the Startup tab.

Fig. 1: Startup properties of the CPU

An S7-300 CPU waits the time for transfer of the parameters to the modules until it checks whether there is a difference between the expected configuration and the actual configuration. If at this point in time one of the DP slaves is not available and there should not be startup if there is a difference between the expected configuration and the actual configuration, then the CPU goes into STOP mode. In this case the CPU has to be set back into the RUN mode when all the DP slaves are available.


 Entry ID:18963092   Date:2004-05-17 
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