glavanov

When you use relative coordinate system, just put negative sign (-) in front of pulse count. The positioning instruction look's for the pulse sign int to cw/ccw the servo [DDRVI k-1000 k1000 y0 y4]

(Untitled Project).pdf Try this. You need to keep D6 and 7 values for one scan only, right? place M8000 NO contact on top of your code, it will set 0 in D6 and D7 at every scan start  

This is your encoder:  https://www.kuebler.com/en/products/measurement/encoders/product-finder/product-details/5873 Well, this is absolute encoder with ISS/BSSI interfaces and yes, it's RS-422/485 (differential line driver), but fx5U builtin rs-485 port is for serial communication and do not have standartd encoder profile protocols. Someone correct me if i'm wrong... Here's how this encoder work's:  https://www.roboteq.com/index.php/applications/applications-blog/entry/how-ssi-encoders-works This encoder have also SIN/COSINE A/B 1024 ppr incremental outputs, but it's also differential driver outputs (5V). You can not red it with Fx5 since  the inputs need 24V +-10% signals.

PLC model?

Encoder model/PN number?

If it's a default or constant value, you can just write sequence in the beginning of your program like:   This way, when you power on the PLC or stop->run your program those values will be loaded in those data registers and you can modify D0 to D4 with HMI, if needed.

Yes, for linear scaling basic math is straightforward, but in my case with taper tension you have to spread a curve over winding roll diameter. With different materials from 1mm thickness cardboard to few microns plastic film the curve range and coordinate points number and location differs drastically. Add the variety of customer requirements and the nightmare is right there! :) This is where multi point coordinate SCL function comes in handy big time!

i remember missing so much this function while trying to do taper tention on a winder... stuck with one FX3G.

 I believe, that he is looking for the SCL instruction. As i recall, this function is not supported by Q00 and Q00J PLCs. This is why i ask for the main cpu model...    

Serious?! http://cn.mitsubishielectric.com/fa/zh/

There's program examples in the Positioning Control manuals for each positioning instruction, but again you have to share with us the PLC/servo series targeted... If you have registration in Mistsubishi FA web site, you have access to program examples for all the motion control systems in the My Mitsubishi section.

And the CPU module is?

I assume, that you want to verify the measured value of the synchronous encoder connected to the 40SSC-S module. Be wear, that you will always have a mechanical error between 2 encoders. If the Synchronous Encoder Axis Setting are correct, it work's flawlessly, but the only proper verifying is with physical metrology.

Here's the basics:  http://www.provendor.fi/mitsubishi/pdf/FX3S/FX_Series_Positioning.pdf You have to be more specific on the PLC and servo series, that you want to operate...

Check sections 1.1 Start, 1.2 Stop, 1.3 Restart from this manual:  http://suport.siriustrading.ro/01.DocAct/1.%20Automate%20programabile%20PLC/1.2.%20Compacte%20MELSEC%20FX/1.2.4.%20Module%20numarare%20rapida%20si%20pozitionare/FX5-SSC-S%20-%20User's%20Manual%20(Application)%20IB(NA)-0300253-D%20(10.16).pdf When Motion module programing tool is open, you can find XLS file with buffer memory addresses in the help drop down menu. Control data Cd.180 - Axis Stop. Page 573 Stop program example. Page 571 Restart program example. You can create sequence program and use that signal to stop motion of you axis while positioning is preformed. When your safety conditions are met, you can use restart to complete the positioning... Here's description of the function blocks if you need it:  https://dl.mitsubishielectric.com/dl/fa/document/manual/ssc/bcn-b62005-719/bcn-b62005-719-b.pdf