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PROFIBUS S7-300/400 CPs -- Configuring and programming communication -- Using communication blocks
How do you program the communication blocks FC50 and FC60?
How do you program communication blocks FB12 "BSEND" and FB13 "BRCV" for data exchange in the S7 program of an S7-300 CPU?
How do you program communication blocks FB14 "GET" and FB15 "PUT" for data exchange in the S7 program of an S7-300 CPU?
Which blocks for Modbus TCP can you rename or re-wire when the block numbers of the Modbus blocks are already being used in the user program?
How do you program the function blocks FB14 "GET" and FB15 "PUT" in the S7 program of the S7-300 in order to transfer more than 160 bytes of data?
Where can you find sample programs and documentation for using the PROFIBUS DP protocol for data communication between SIMATIC S5 modules and SIMATIC S7 modules?
Where can you find sample programs and documentation for communication from SIMATIC S5 modules to SIMATIC S7 modules by way of PROFIBUS using the free Layer 2 of the FDL protocol?
Where can you find sample programs and documentation for communication from SIMATIC S5 modules to SIMATIC S7 modules by way of PROFIBUS using the FDL protocol?
Where can you find sample programs and documentation for using the PROFIBUS FMS protocol for data communication between SIMATIC S5 modules and SIMATIC S7 modules as well as for data communication between SIMATIC S5 modules and PCs?
Notes on using an instance for multiple connection IDs
Processing the data from DP slaves via CP342-5 on CPU31x
Block calls for communications processors in multiple runtime layers
Changing the input parameter of the user blocks "AG_SEND" and "AG_RECV" during the runtime of a job
What should you watch out for if you transfer variables with the data type "REAL" when calling the communication blocks FC5/50 "AG_SEND/AG_LSEND" and FC6/60 "AG_RCV/AG_LRCV"?
How do you program the communication blocks FC5 and FC6?
What properties and special features does S7 Basis Communication offer?
PROFIBUS: diagnostics of S7 connections with STEP 7
Repeating the "BSEND" job (SFB12) when the "BRCV" block (SFB13) is in the "disabled" state ("EN_R = 0")
How do you program communication blocks FB8 "USEND" and FB9 "URCV" for data exchange on the S7-300?
Particularities when assigning parameters of the communication blocks of CP 342 / CP 343
What should you watch out for when upgrading the CP 342-5 or fitting spare parts?
Which version of the function blocks do you need to operate a CP 342-5?
CP 342-5 -- How can you tell that the CP 342-5 has withdrawn from the PROFIBUS?
CP 342-5 -- How do you program data communications when your DP slave only has outputs?
CP 342-5 -- How can you read and write consistent data of a DP slave via the CP 342-5?
CP 342-5 -- How can you tell that the CP 342-5 has withdrawn from the PROFIBUS?
Part number:

Instructions:
Through various faults on the PROFIBUS (double-token etc.) it might happen that the CP 342-5 then withdraws from the bus. In doing so the CP 342-5 switches to the CLEAR operating mode. However, this event is not entered in the diagnostics buffer of the CPU. Nor is an alarm OB called in the CPU. The only way of finding out about this is via the communications blocks of the CP 342-5. For this you have 2 options:

  1. Evaluate the parameter DPSTATUS on FC 2 "DP_RECV".


Fig. 01: Sample call of DP_SEND

 

If Bit 5 is on FALSE and Bit 4 on TRUE in the DPSTATUS parameter, then the CP 342-5 is in Clear mode.

  1. Call FC 3 "DP_DIAG" with DTYPE 4 job


Fig. 02: Sample call of DP_DIAG  
 

Note
More information on evaluating the return parameters from the communications blocks is available in the Online Help of STEP 7. For this you select the required block in the block folder of your project (FC 1, FC 2 or FC 3) and press the F1 key.

 Entry ID:21627608   Date:2005-06-20 
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