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Problem with ET 200S 1SSI module. (modbus)

Created by: Alexandr B. at: 10/21/2014 10:36 PM (8 Replies)

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10/21/2014 10:36 PM	Rate (0)
Alexandr B. Posts: 7 Rating: (0)	Good day! I have a problem with ET 200S 1SSI module. Details: I have 6 slave devices. They connect to 1SSI module. When all of the 6 slave devices work (powered), i can read all of them. It's no problem. All problems start when i disconnect one of the slave device from power supply. I don't touch rs485 circuit, I turn off breaker only. After this step i can't read any slave device. "S_SEND" tries send data to slave device, but DONE bit =0 all scan cycle (for exemple, scan cycle for one deviсe in my programm = ~1sec (~20 PLC's cycles)). When i turn on the breaker problem has gone. What could be the cause of this problem? What may be wrong in my programm? Work of "S_Send" and "S_RCV" blocks i configured like in the manual (Modbus_y_USS1_76, see page 4-3 figure 4-1). Every seconds i start poll one of the slave device. First programm cycle i set R-bit (perform reset) for "S_SEND" and "S_RCV". Second programm cycle i reset R-bit. Third programm cycle i set REQ-bit for "S_SEND" block and set EN_R-bit for "S_RCV". Next steps like in the manual (figure 4-1). When first seconds end i write new modbus_address and start poll second slave device. All steps repeat. etc... What happened with "S_SEND" block, when it can't connect to the turn off slave device? Why "S_SEND" block can't work properly, when one of the slave device turn off? Please, help me!!! I can't find solution 2 weeks. Need a "fresh" look...
Alexandr B. Posts: 7 Rating: (0)
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10/22/2014 8:19 AM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Alexandr, for each triggered S_SEND you will get DONE or ERROR. I recommend to check ERROR as well and to evaluate STATUS. It is not necessary to reset the blocks regularly. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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10/22/2014 11:03 AM	Rate (0)
Alexandr B. Posts: 7 Rating: (0)	HelloKaulquappe! When i turn off one slave device i see next picture: DONE-bit=0; ERROR-bit=0; Status-word=0 ("S_SEND" and "S_RCV"). This is not possible... Are S_SEND" and "S_RCV" blocks hangs? Why is it happening? How to write a correct sequence of survey slave devices? Maybe problem is in wrong sequence?
Alexandr B. Posts: 7 Rating: (0)
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10/22/2014 12:18 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Alexandr, the outputs of the FBs are displayed dynamically, they are only available one cycle, so you can't watch them in the variable table. You must evaluate the outputs in the user program and store STATUS when ERROR is TRUE. I recommend to use a done counter and an error counter, than you can watch easily in the variable table what happened. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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10/22/2014 5:20 PM	Rate (0)
Alexandr B. Posts: 7 Rating: (0)	Kaulquappe, of course i didn't look on dynamically outputs. I fixed when Error-bit=1 and move Status-word to another Status_Temp-word and looked on it. But i sawDONE-bit=0; ERROR-bit=0; Status-word=0. Fortunately i decided this problem. I don't know exectly what actions have afected on work of my program. I changed response time of 1SSI module from 1500ms to 700ms, and reset RST-bit. All started work properly.But now i have another problem. Poll frequency=1hz - is very big. When i increase it, received values begin to be confuse. One device show good value, second device show wrong value, etc.Why it so? Maybe old values stay in "S_RCV" and registers doesn't have time to cleanse? And how can i accelerate modbus transfer in this situation?
Alexandr B. Posts: 7 Rating: (0)
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10/23/2014 2:42 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Alexandr, as the SI-Module transfers the data to/from the CPU viathe input/output area in blocks of 3 / 7 / 31 bytes it needs several CPU cycles until the whole block was transferred. You can easily calculate the required time. Each triggered S_SEND will be report either DONE or ERROR. The outputs are set when the data were sent and the respond was received from the SI module. After the output for S_SEND was set the received data are evaluated and transferred to the CPU. That means, error 0830 (which will occur when a device was switched off)will be reported by S_SEND. The other errors are reported by S_RECV (e.g. exception telegram). When error 0830 occurs,the S_RECV won't report NDR or ERROR. Your program sequence should be - trigger S_SEND - wait for DONE or ERROR of S_SEND - wait for NDR or ERROR of S_RECV - set data for next send - trigger S_SEND (S_RECV is always enabled) When one device was switched off the following sequence is required: - trigger S_SEND - wait for DONE or ERROR of S_SEND - ERROR 0830 of S_SEND - set data for next send - trigger S_SEND (S_RECV is always enabled) Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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10/23/2014 9:23 PM	Rate (0)
Alexandr B. Posts: 7 Rating: (0)	HelloKaulquappe! If all were so easy, i didn't write in this forum. You are right in all, i don't argue. But this sequence doesn't work in my situation. I don't know why, but i haven't error=0830 from S_SEND, i have done_bit=1 after 30 CPU cycles(device switch off in this moment)... I can connect you for my PC (using teamviewer) and you'll see my problem. Maybe you''ll see somthing, what i can't see.
Alexandr B. Posts: 7 Rating: (0)
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10/24/2014 9:32 AM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Alexandr, well, in this case I recommend to start a service request. I don't know what is going wrong in your case. It is all right that S_SEND is finished after the monitoring time has elapsed. But it should be finished with error. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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11/11/2015 2:44 PM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating: (122)	New question published by swaroop89 is split to a separate thread with the subject Send string to a Printer using RS232. Best regards Min_Moderator

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