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MODBUS RTU MASTER FOR CP340/341/441-X (NO DONGLE REQUIRED)

Created by: TIBI68 at: 7/5/2014 6:15 PM (208 Replies)

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12/12/2014 7:45 PM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 10/27/2024 Posts: 672 Rating: (147)	Dear Chis_18, kindly delete the flagM10.0 from both of the blocks first and then restart your CPU. If you still have any problem send me an email. Best Regards.
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12/15/2014 4:59 PM	Rate (0)
mdajda Posts: 1 Rating: (0)	Dear TIBI68, I would like to use your Modbus RTU master for CP340, but i am using TIA v13. I have tried to migrate your project to TIA but mission failed - TIA informed me that some packages are missing in my Step7 cry Is there any solution for this situation? Maybe someone can share his project (with TIBI68's Modbus Master) in TIA version? Best Regards.
mdajda Posts: 1 Rating: (0)	Last edited by: Cthulhu at: 12/15/2014 5:07 PM
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12/18/2014 8:34 AM	Rate (0)
Chis_18 Posts: 20 Rating: (1)	Dear TIBI68. I'm sorry. I didn't say it, but I have put these flags because the error I said, so the error dissapears. I can't try it again until january. I'll tell you my progress. Best regards.
Chis_18 Posts: 20 Rating: (1)
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2/20/2015 12:45 PM	Rate (0)
Chis_18 Posts: 20 Rating: (1)	Hi! I'm testing again. Now the TXD led on the CP340 is blinking on green color. But I don't get the values and I don't get the "DONE" value to TRUE. Error=0 and STATUS =0 (every time) I'm not sure of the start and end register, but it is the specified for the manufacturer (function 03x registers 39xx) I'm still working on it. Best regards! Attachment captura modbus chis_18 1.JPG (869 Downloads)
Chis_18 Posts: 20 Rating: (1)
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2/20/2015 5:22 PM	Rate (0)
Chis_18 Posts: 20 Rating: (1)	Well. Looking better, I can see error each 3 seconds (as it's configurated), and status when I pass to RUN is E006. Best regards!
Chis_18 Posts: 20 Rating: (1)
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2/20/2015 6:13 PM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 10/27/2024 Posts: 672 Rating: (147)	Keep going your are getting there. I suspect wrong addresses as well. Kindly assign a free MW to monitor the STATUS output from the MBMAREQ Block. You can also upload us a document from the slave and tell us what are you planning the read. Best Regards.
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2/23/2015 8:20 AM	Rate (0)
Chis_18 Posts: 20 Rating: (1)	Hi TIBI68. Thanks for your help. I've tried to disconnect the RS485 wires in the PLC and the TXD led stays blinking on green colour. I've sent you a PM Best regards.
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2/23/2015 6:32 PM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 10/27/2024 Posts: 672 Rating: (147)	Hallo, I had a quick look into the manual. Change: START to 43001 END to 43020 Verify the Interface parameter from the CP in HW Config Should be set to 9600, 8, 1, EVEN Check your wiring. Good Luck!
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2/24/2015 7:04 PM	Rate (0)
Chis_18 Posts: 20 Rating: (1)	Hi! thanks for your help. I've tried theses registers and they don't go. I've reviewed the configuration in everywhere. 9600, 8 bits, even, 1 bit. In the PLC (CP340) I've DB15, and I configurated interface halfduplex. I've changed the wires position, but the result is the same. I have on PLC (DB15): -pin 4, TX, red wire -pin 11, RX, green wire. I had on Slave: -conection +, green wire -conection-, red wire. And now I have on Slave -conection+, red wire. -conection -, green wire I've tested with a new pair of wires, but don't works too The support of the manufacturer of the slaves tellme that I can test with modscan32 (from the PC). I only have usb-serial port converter, and they say it would work too (I always thought I would need a usb-RS485 converter), but today it doesn't work. I will keep trying tomorrow best regards!
Chis_18 Posts: 20 Rating: (1)	Last edited by: Chis_18 at: 2/24/2015 7:06:25 PM
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2/27/2015 3:43 PM	Rate (0)
Chis_18 Posts: 20 Rating: (1)	Hi all! Well, after of a few days, I have all the slaves comunicating with modscan32. I do it trough a converter modbus TCP<->modbusRTU. Some slaves need restart to aply new changes, As soon as I can, I'll test RTU from CP340 again. Best regards
Chis_18 Posts: 20 Rating: (1)
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