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SCL: How to read and verify process data (PPM frames) from a Profinet IO device.

Created by: Nijin P at: 9/4/2015 11:32 AM (5 Replies)

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9/4/2015 11:32 AM	Rate (0)
Nijin P Posts: 4 Rating: (0)	Hello Experts, We are working with S7-1511 CPU and TIA portal 13. The PLC is communicating with my PN IO device and exchanging the process data (CPM-PPM frames). Now I want to write a SCL program to read and verify the contents of PPM frames sent by the IO device for data integrity tests. The process data data is exchanged at 250us time and I want to read this data in each cycle to an array where I can check for errors in the protocol data unit contained in the PPM frame. I have gone through the basics of SCL program and written a program using 'GETIO' instruction(GETIO_FB.jpg). Is this the right instruction to read the process data exchanged by an IO device or is there any other suitable standard instruction? When I have downloaded the program to CPU and going online with the controller, I am getting following errors: 1. Error status indicates 16#4080_9000. From the help, this error code stands for wrong hardware identifier or length mismatch with consistent data(MAIN_OB_error_message.jpg). I have cross checked the hardware ID is correct from the system constants list (hardware_name1.jpg,hardware_name2.jpg) 2. Output length is zero which means data read failed. But I am using a byte array of length 64 bytes which is same as process data length. Can any one help me to resolve these issues by pointing out where I am going wrong? Please let me know if any additional details are required. Regards, Nijin Attachment SCL_Progam_Error.zip (200 Downloads)
Nijin P Posts: 4 Rating: (0)
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9/4/2015 12:36 PM	Rate (0)
Kahl Platinum Member Joined: 12/16/2012 Last visit: 9/8/2025 Posts: 655 Rating: (132)	Nijin P ..... But I am using a byte array of length 64 bytes which is same as process data length..... Hi! You use a 65-byte-long array (from 0 to 64). What is the data range length of your PN IO device, 64 or 65 bytes?
	ZEISS SMT
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9/4/2015 12:55 PM	Rate (0)
Nijin P Posts: 4 Rating: (0)	Hello, The data exchanged between the PLC and the IO device is of 64 bytes (header+40 bytes data payload+trailer). See PN_data_exchange.jpg Also I have tried modifying the array length in Main OB1 as 'Array[0...63] of Byte'. But that didnt resolve the problem. Is there any other possibility for this error? Regards, Nijin Attachment PN_data_exchange.jpg (301 Downloads)
Nijin P Posts: 4 Rating: (0)
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9/4/2015 1:20 PM	Rate (0)
Kahl Platinum Member Joined: 12/16/2012 Last visit: 9/8/2025 Posts: 655 Rating: (132)	Hi! Have you tried it with a 40-byte-long array? Can you check the data range of your PN IO device? Manual, etc.
	ZEISS SMT
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9/7/2015 9:14 AM	Rate (0)
Nijin P Posts: 4 Rating: (0)	Hello, I tried with 40 bytes long array, but it did not help. Also I found an instruction 'DPRD_DAT' (Read consistent data of a DP standard slave). But I am getting similar errors by using this instruction also. Does any one have a working Example of DPRD_DAT instruction Which I can refer to? Please let me know if you need more details to figure out the issue. Regards, Nijin Attachment PNIO_data_read_error.jpg (322 Downloads)
Nijin P Posts: 4 Rating: (0)
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9/7/2015 3:35 PM	Rate (0)
Kahl Platinum Member Joined: 12/16/2012 Last visit: 9/8/2025 Posts: 655 Rating: (132)	Hi! FYI: https://support.industry.siemens.com/cs/document/82841762/sinamics-gs-configuration-of-standard-telegrams-in-tia-portal?dti=0&lc=en-WW BTW do you use SYSBIOS from TI? Sounds like an interesting project.
	ZEISS SMT
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