hugojose

OK, Don't know exactly what did it, but first removed battery. After 1/2 hour reinstalled it and powered it up. I could tell still had old program which did not expect. Went into Communication and OS and reinstalled OS and Boot program and took it. .....after that was able to upload program that was there w/out error. Looks good. Thanks guys for your help.

Ausman, and Kratmel, Thanks for your replies. Yes am running Visilogic as Administrator. And by the way, have also an even older V120, and I can communicate, program, download, upload to it, using same computer, software (the latest), and same cable with no problems. .......am interested in restoring everything to factory settings, but not sure if there's such thing on these Unitronics. Am going to look into taking battery out as some one mentioned in link provided by Kratmel.

Am trying to upload/download from a old V130-33-TR20. I get and "Overflow, error 6". Tryng downloading new OS, it goes as far as trying to delete files on PLC, and then quits, not being able to communicate with PLC unless turned off and back on. Can go no further. Any suggestions?? Thanks.

it did work, as advertised above. Thanks Simon, AlexUT, and Gabriel. I appreciate the help grealy. Hugo

Thanks, for your reply, Yes, I tried that too, but it does not work either. Modbus starts counting on 1 not 0, so generally you have to add 1, By reading deeply in the Unitronics help found that I have to add xx/FLOAT to the address, so I was able to bring at least a number that changes by using 7741/FLOAT. The 41 is because a read a post in the forum where somebady was able to read ML registers in Modbus by using (MLx2+1)+45100 (5100 is for MLs), thus applied same formula for MF plus the \FLOAT. However I am reading in VTS a very low ridiculous number that changes, when I change it in the MF Unitronics register. I have the feeling that what am reading is the two 16 registers that makes the float in reverse order, and have to find a way to swap them. Thanks again.

Hi all. I am trying to configure VTS Trihedral Scada system with a V120 PLC configured as slave, for monitoring a lift station using Modbus protocol. I can read/write from VTS to registers MBs and MIs, however am having a hard time with the floats (MFs registers). According with Unitronics Modbus Slave Table, the Modbus register for MF 0 starts at 7700. I am trying to read MF 20 and I've tried in VTS 47721, 37721, 407721, and 307721 with no results; the VTS Modbus driver does not seem to understand this addressing and simply draws a blank. What am I missing? I've googled and tried researching this issue but have not found much on Unitronics Modbus floats. Any help would be greatly appreciated. Hugo

Am trying to connect a Vision 120 to a Trihedral VTS Scada usng Modbus RTU serial but am having difficulties with the DB9-RJ11 pin out. I understand it should be RX 2 -> 3 TX TX 3 -> 2 RX DTR 4 -> 6 DSR GND 5 -> 5 GND GND 5 -> 1 shield DSR 6 -> 4 DTR Jumpers PC side: RTS 7 -> 8 CTS PLC side: RTS 7 -> 8 CTS PLC side: cable shield to 1 Shield If this is right, what do I do with 7 and 8 PLC side if the RJ11 only has 6 pins?? Don't suppose Unitronics would have a Modbus DB9-RJ11 cable, would it?? Any help would be greatly appreciated. Hugo