Vision & Samba PLC + HMI Controllers & VisiLogic Software
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Could you please put up screenshots of your ComInits, for both 1 & 2. And in doing this, you might find a teensy weeny little thing that is the issue! That's what I find when I'm finally asking about a frustrating question...the typo suddenly stares me in the face, saying "Here I am...I've been waving at you all day!" I am suspecting that perhaps your timeouts on 1 are shorter than on 2. What do the status bits on using both ports say when trying things? As well, you say yet you are doing 485 on the plc, which at the speed you have is not a fast process and allowances have to be made accordingly. But also please explain the "232" setup. cheers, Aus -
I am trying to change your setup... I had a similar design with 9 frequency converters (unfortunately, there is no photo). V1210 is used with expansion modules on the backplaine. There were no problems. But all grounding is done in one bus at the bottom. I placed the power wires to the left, and the signal wires to the right of the frequency converters. Maybe this link is useful https://solutioncenter.yaskawa.com/selfservice/viewContent.do?externalId=11736&sliceId=1 -
Hi, how can i increase the amount of this retained memory? I have 3 data tables, 3065 rows each... I have same error message. -
By Ivan Ristic · Posted
Hello. Sorry for late answer. @kratmel I did test connecting 0V to ground but same problem. I try to separate FG connection of all IO modules from ground and then it was better. Still losing communication but less frequent. I have also cable for Modbus communication between all 10 VFD. I forget to mention this. When I disconnect cable from RS485 connector on the CPU module then it works. Still from time to time lose connection to IO modules but it's much better. It looks like problem with ground loops together with noise from the drives. All 10 VFD are in the same cabinet. This is first project with this number of drives that I used. I have picture while the wiring was still not finished. Control wires to VFD are mixed with power lines. Motor cables are shielded, and shield is connected on both sides with ground. Cables go behind back plate through holes, so they are at least not close to other wires. I will try to separate them as much as possible, but problem is that I must finish all till the end of the week. All VFD ground points are connected to common ground on the bottom of the cabinet. Maybe I could try metal plate proposal to separate VFD from PLC IO modules. One thing that I could do is to move all IO modules and install them on the back of Unitronics panel and extend wires from old position to panel on the door, but I am not sure is this going to help or make more problems because of longer wires? -
I am debugging COM1 port while being connected to Vision PLC over Ethernet. So it should not interfere. The devices that Vision is talking to are no more than 0.5 meter distance from it. They are powered by same +24V supply as the PLC. So there should be no separate grounds or high voltage potentials. I have even tried taking GND pin of Vision COM1 port and connecting it to GND pin of the device, and still nothing. I do have capabilities to debug this on electrical level (oscilloscope, logic probe), but I thought that maybe there are some tips or undocumented stuff about COM1 port, before succumbing myself from system integrator to hardware hacker mode.
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