[Unican sends 512 MIs per scan....How?]

Hello Ausman,

@Ausmanthank you for your feedback,

in attachment few pictures of my program, please check it and tell me if iam going in right direction?

Best regards,

[Unican sends 512 MIs per scan....How?]

Hello,

@Ausman I would ask you to share screen shot of how you did multiple "STRUCT" and "UniCAn Send "commands? (i have 23MIs long vector to send form V1210 to RC1).

Best regards,

[V1210 Modbus(RS485) communication with Danfoss VLT 5000( software version 3.6) VFD]

Hello to all,

We are in project which requires that operator from one place, one touchscreen, controls (start-stop, change freqencies etc.) of 36 converyors. All conveyor control  same VFD model Danfoss VLT 5000 (software version 3.6). We are using V1210 vision PLC with two RS485 ports. 

We know that VFD-s are pretty old, and we also do not have much experience with Modbus (RS485)communication.

We would ask for advice, project sample, anything that can help if anyone had some experience with Modbus comunication with this type of VFD.

In attachment , sample of project where we used RS 485 to control Yaskawa GA 500 VFD, can it function in same way with VLT 5000? We also cannot find adequate documentation about holding registers for this VLT 5000 VFD.

Thank you in advance for every help,

Best regards.

V1210 to VFD VLT 500 with RS485.vlp

[Stone cutting machine setup]

10 hours ago, Ausman said:

Don't forget there is also a 1.25ms interrupt for enhanced models, which yours should be.

cheers, Aus

I forget about it, 

ty, cheers

@kratmel,  valuable informations,

Yes, only limit switches, first cutting position (start of cutting procedure) set operator manually, depending of stone boulder size and position on table.

I have a similir setup, and will try with similar approach.

Ty

 

[Stone cutting machine setup]

13 hours ago, Pavel_setnicar said:

Does it mean that till now you did not use interrupt ?

Yes, i had one project with interrupt routine already. This is new project, before start i want to check what is best setup

 Ty, cheers

[Stone cutting machine setup]

5 minutes ago, Pavel_setnicar said:

Maybe .........

I assume  that you are using interrupt routine , right?

Yes, i will to use 2.5mS interrupt routine for STOP function.

I saw this kind of machines that work OK with open looop systems, so I am just looking for advice from someone with more expierience  what is  best and easiest possible way to do it. 

Cheers,

[Stone cutting machine setup]

32 minutes ago, Ausman said:

are you saying that is the shortest ramp time possible?  In some ways you need to decide whether to ramp it with the plc, or it's innate systems.  I also feel sure that the drive will have a digital input for stop, which might make things easier.

Hello Aus,

Yes, ofc, VFD has digital input for STOP ( to this point drive recieved  this signal from Counter, now should  recieve it form PLC)

VFD settings allow the shortest possible ramp time of 0.1 s( range from 0,1-600 s),its an old Vee Elvovert VFD.

About home position, there should be no problem, I have limit switches installed.

Cheers,

 

 

[Stone cutting machine setup]

Thank You for feedback,

Its really helpful,

@kratmel,I know that closed loop setup would be best and easiest solution, but like every costumer he wants to get as much as possible with lowest possible investment. This whole setup is already at machine,except PLC (there is HS counter that is bad,) and costumer wants to have all commands valves open -close , start ,stop etc... at one place so I want to use HMI PLC to hook everything on it. FAST and SLOW speed seems like a good solution, on this VFD there is not dicrete input for set point change, but it has analog input for speed control so I can use it to control speed from PLC. Other thing,i, supouse it is foolish question, but what with VFD acc.-deacc. time, can it make problem in this setup?(when PLC gets info from encoder that given distance is traveled, and  sends stop command to VFD - so can this deacceleration time  be problem here in order to overshoot target distance ?

@TozoM8 , us i understand You have used within range block in ladder to send FAST and SLOW speed to motor depending how close is to target value.

On 2/8/2021 at 3:28 PM, TozoM8 said:

 I've used a NO contact with the run command to store the MIs all the time and reload with SB2 at startup. This way it will remember the las position at startup. 

Can You give a little more detailed explanation about this two last sentences?

Best regards,

[Stone cutting machine setup]

Hello to all,

I would ask for an advice about setup for stone cutting machine project. Machine cutts big stone boulders to 2-10 cm thick plates with required precision of  0 to +1-3 mm depending of thickness. Costumer has a problem with x -axis movement (this movement defines the thickness of plates), because it is not precise enough. The setup i have conatins:

 -Induction motor for x-axis movement,

-VFD for induction motor,

-Incremental encoder for traveled distance feedback hooked to PLC.

-Vision PLC .

I have a few projects with only PLC or VFD setup, but first of this kind, so i would ask someone with more experience for advice how to achive precise positioning depending the given target value by operator and best setup for this project . The possible problems are inertia (the X -axis holds big hydraulic cutting motor) and also the lowest acceleration and deceleration value that i can set at VFD is 0.1sec. Supouse that I have to lower the speed of motor movement depending how close to target value it gets to achieve precise stop. What is the best possible way to do it through ladder ( PTO or simple math functions)? 

Any kind of help will be appreciated,

Best regards,

[SD-card trends HMI screen preview]

Hello,

I would ask You for information about reading data from SD card on PLC HMI.

Program is done, costumer demand is to have possibility to record  and read a trend (with temperature and pressure data) from every machine cycle.   My  V700 does it well, and costumer  read data from SD on one of HMI screens.

Problem is with preview of trends, because first what i see is oldest recordings and ofc (depend of number of recorded cycles), we need a lot of time to find newest trends.

Is there any system solution for previewing, first from the newest trends (last recorded trend) to oldest?

Thank you in advance,

[Communication problem between V1210 and EXF-RC15 via CANbus]

7 hours ago, Ausman said:

Also, in case you haven't already done this, have a good read of the Help files.  Use index to find UniCan and then read Canbus UniCAN, looking at everything on the page be it the green links and also related topics, as well as UniCAN.

cheers, Aus

Thanks for advice, i red it, but never enough. Will try...

Cheers

[Communication problem between V1210 and EXF-RC15 via CANbus]

3 hours ago, Joe Tauser said:

Your RC15 program isn't including them in the STRUCT collect block, as I only saw DW 22 and DW32.  So they're not being sent.

UniCAN is a one-way transmitting protocol - the V1210 can't "read" the RC15. 

What exactly are the addresses of the Run bits you want sent back to the V1210?

Joe T. 

Hello Joe,

Thank you for reply,

I only send them from V1210 to RC15 it is MB1000, 1002, 1010 ( linked to buttons on 1210 hmi) when i activate them i activate high speed outputs at RC15., but when target is reached RC15 does not send "info" to V1210 that they are off.  You have just said that UniCAN is one-way transmitting protocol, so( i can not send same bits info in other way?)...I’m pretty new in programming especially in communication problems so probably my problem description is not the best one  

Best regards,

Matej

[Communication problem between V1210 and EXF-RC15 via CANbus]

10 hours ago, Ausman said:

Hi Matej, I haven't looked in depth at your program, only quickly, and for a starting point I would be interested to know if slowing down your Unican rate helps at all.  Shift it back to 10Kb and if that fixes the issue, then increase it in upward steps until you find the speed that is stable.  Superfast is great, but sometimes buffers/line problems/fairiesandgoblins etc create issues that make it hard for the system to keep up with what's needed.  Don't forget you need to change this speed on both units each trial.

Perhaps a later closer program inspection might reveal something obvious, but try this for now please.

cheers, Aus

Hi Ausman,

First of all thank you for reply,

Do u think at Baud rate?

If yes, i will try with slowing it down and see whats  going to happen,

Best regards,

Matej

[Communication problem between V1210 and EXF-RC15 via CANbus]

Hello all,

We would ask you for help or advice, we have some  problems with communication between this two PLC-s V1210 ( moduleV200-18-E46B) and remote I/O EXF-RC15 via CAN bus.

We control with 5 servo motors (Yaskawa), two of them is controlled by V1210 and other 3 by EXF-RC15. Everything keeps smooth when we control only 2 motors which are attached to

V1210. Problems starts when we finish programming some of other three motors controlled by EXF-RC15 - (when we need communication between this two PLC-s’9. For example when we push on run bit for one motor (Button on V1210 display), its pushes on all other motors run bit etc. We send data about run bits from EXF-RC15 to V1210, but cant send same in other way and for that reason RC15 does not send to V1210 info when run bit is off ? At the and we solved problem with auxiliary bits through ladder logic but we really want to know what is problem. In attachment u can find both programs, i hope that you will look at it, and give us some advice...

We would really appreciate any kind of help....

RC15.vlp

V1210.vlp