Jump to content


  • Content Count

  • Joined

  • Last visited

  • Days Won


kratmel last won the day on February 8

kratmel had the most liked content!

Community Reputation

9 Neutral

About kratmel

  • Rank

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. I would recommend that you do the following steps and explain the results: 1) try to connect the two devices that are left with a separate twisted pair (Terminated on both end). Result? 2) try to see what is transmitted from controller to vfd and in the opposite direction in info mode. Result? 3) try to use port 2 for communication (it is advisable to use an isolated version of the additional communication card). Result? 4) If it is possible to turn off only the power supply of the flowmeter, leaving it connected to the communication line. Result? 5) Add another "virtual" device to the system - the V350 in slave mode - self connected to you network. This is explaned in visilogic sample project. (However, you also need an additional communication card). Result? 6) Try to setup only VFD connection in program, Then add in program flowmeter reading only when all data from VFD is transmitted to OPLC. This is maybe strange idea, but if VFD connection is lost then no flowmeter readings subroting present, and no transmission to flowmeter can return transmission to VFD. Generaly you must build counter that count and allow to transmission all communication subroutings sequantally. Than you must read status off connection in step and if status is not OK after some delay you must go to next communication step.
  2. I discovered the following cable laws: 1) The new cable for the robot teach pendant will be damaged by the reach track during the first day after the installation. After some time, the possibility of such damage is significantly reduced ... 2) The same robot cable always twists in one direction and makes loops - people constantly walk in a circle in one direction :) 3) No matter how many cables are near your computer. They will still be twisted together very quickly. 4) When it is necessary to remove insulation from several conductors of the cable - one of them will be damaged.
  3. Please try to find RFC-1305 in help. Maybe is useful https://lastminuteengineers.com/esp32-ntp-server-date-time-tutorial/
  4. If communication OK when VFD is stopped - your parameters and configs is OK. Is it terminator (120 Ohm resistor) present on both side of the line? Please also see this topic
  5. Please Find MB64 in your program and post result to the topic.
  6. In old PLC external keyboard is interfaced by N-output = column and M-input = row. N x M keypad is worked in dynamic scan mode. In simplest configuration you must to use one input for one external button (expansion up to 128 input can be connected). Otherwise you must
  7. I have my own way of storing completed projects for a PLC - to send an archive with a file from my own mailbox to my other mailbox. The file remains in the folder in the mail sent and in the mailbox. The advantage of such a method is the availability of the two copy of project in an arbitrary place where there is an Internet connection. A thumb drives has already become such a number that I'm starting to forget where I recorded something
  8. As i see it is Samba PLC. Maybe you use the port and protocol configuration wіthout SB2 contact. You must go to info mode and Stop PLC for make connection possible. Please post vlp with protocol config.
  9. I do not know if this will help, but in some programs it is a warning that when exporting to the exel, you must remember the country in which you are. In that case, excel use system separaror that is a coma or dot. It is selected in excel parameter. Please uncheck "use system separator" and use dot as excel internal separator. Then try to reopen your file.
  10. Perhaps the only problem is programmed in PLC logic of work. If we have a cyclic process, then it's easy to go back to the previous state before power is turned off. However, if the power supply turning off can cause uncontrolled events in the system, it is impossible to return to the previous state. It usually causes a complete restart of the system or the operator's intervention needed. P.S. I liked the mechanical "PLCs" installed in old washing machines. Turning off the power did not affect the cycle of work. After turning on the power, all processes continued until the end of the program. An electric motor and a drum with contacts are good "memory registers" that are not erased when switched off.
  11. I'm very far from Chicago but the internet is incredible and I "walked" to this place and made a "photo". VFD below control cabinet say - "It is real installation!" Some vintage devices present also :)
  12. As far as I understand, this concerns the integration of frequency converter control (commisioning) functions into the software. Such software accelerates the commissioning process. Because it is not necessary to keep specialized software on the computer for this purpose. However, it will probably not affect the time of mechanical installation or connection of this type of device. Therefore, I think that these two sentences have different meanings as the JohnR noted. P.S. When I need to compare similar terms, I try to translate them into another language and then do the reverse translation. Sometimes there are quite interesting experiments.
  13. I have the same issue.. As i see for time keypad entry checkbox is active. Maybe problem is in selected area - checkbox is not active for day and month? This question is to creators.
  14. Maybe https://support.unitronics.com/index.php?/selfhelp/view-article/i-updated-my-plc-v570v350-system-files-and-i-had-power-break-down-during-the-download-now-my-plc-has-a-black-screen-how-can-i-recover-the-plc will be helpful.
  15. At a time when the optical fiber only appeared in automation, I sometimes must to replace it with a pair of twisted wires as wrote Aus (not even shielded) and the 485 receiver + transmitter. There was also an optical isolation and all this works until today. Now I understand that I did not even think about how fast the connection was. But terminators were needed at both ends of the line. Otherwise there were communication errors that arose when something powerful turned on nearby.
  • Create New...