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CP341, Modbus, Error Code 0E31

4/16/2008 2:09 PM	Rate (0)
Vac Regular Member Joined: 3/31/2008 Last visit: 4/21/2023 Posts: 15 Rating: (0)	I have been making simple program that writes(FC16) first and then reads (FC3). Write is always succesfully but read command is not. Read commandalways gets error code 0E31 (Time out during data transfer.) What could be the reason for this? I include pdf prints from my program. Attachment FC1.pdf (543 Downloads)

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4/21/2008 4:47 PM	Rate (0)
Scott Bronze Member Joined: 10/23/2005 Last visit: 3/31/2020 Posts: 81 Rating: (9)	Vac, From looking at your program you need to have FB7 P_RCV_RK to get the data back from the device and put it in a data block specified.

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4/22/2008 12:49 PM	Rate (0)
Vac Regular Member Joined: 3/31/2008 Last visit: 4/21/2023 Posts: 15 Rating: (0)	I have FB7 in FC2. My program works fine when I use 2 Read commands. Then I don't get Time Out Error. Only when I change one Read command to Write command is when the problem occurs. No error occurs with Write command but Time Out Error occurs with Read Command. In the program M30.0 SND_REQ_2 is what activates the Read command. And I have noticed thatM30.0stateisstuckat"1"for12,03s.AfterthatM30.0statechangesto"0"and then the programmovestonexttask. In the program I use Write Multiple command without FB7. Do I have to use FB7 with Write command? IknowthatIhavetouseFB7whenIreadsomething. Whatcouldbethereasonfortimeouterror? AretheresomerestrictionswhenusingReadandWritecommand?

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4/22/2008 10:31 PM	Rate (0)
Scott Bronze Member Joined: 10/23/2005 Last visit: 3/31/2020 Posts: 81 Rating: (9)	I guess that would make me wonder. Even though you are only writing data I believe the hand shaking is still needed. When I have used thisFB7 is active on all function's.

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4/25/2008 12:48 PM	Rate (0)
Vac Regular Member Joined: 3/31/2008 Last visit: 4/21/2023 Posts: 15 Rating: (0)	Here is FC1 and FC2. (I Call FC1 and FC2 in OB1) Is this correct way to use FB8 and FB7. Now this program send's Write command and then activates FB7. But FB7 does not give anything.ErrororDonebitdoesnotactivate. Attachment Prog.zip (461 Downloads)

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4/25/2008 5:19 PM	Rate (0)
Scott Bronze Member Joined: 10/23/2005 Last visit: 3/31/2020 Posts: 81 Rating: (9)	VAC, FB8 inputs DB_NO = Data block number with information. DBB_NO = the offset to start reading data below. (Slave Address -Byte, Function Number - Byte, Start Register - INT, Number of registers - INT) This is equal to 6 Bytes which is the LEN. So for a function 3 or 4 the length would always be 6. For a function 16 the length will depend on how many words you write. 2 bytes per register. Example - DB 42 DBB 0 = B#16# 1 DB 42 DBB 1 = B#16#10 DB 42 DBW 2 = W#16#7DO DB 42 DBW 4 = W#16#3 DB 42 DBW 6 = Write word 1 DB 42 DBW 8 = Write word 2 DB 42 DBW 10= Write word 3 Len = 12 bytes DB 42 DBB 0 = B#16# 1 DB 42 DBB 1 = B#16#3 DB 42 DBW 2 = W#16#835 DB 42 DBW 4 = W#16#3 DB 42 DBW 6 =Ignored DB 42 DBW 8 =Ignored DB 42 DBW 10=Ignord Len =6 bytes = "SEND_LOHKO".LEN Hope this helps.

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