Tool sensor with decelerate option on Mazak VQC retrofit

Hello,

I almost finish retrofitting my Mazak VQC15/40.
The machine has been manufactured in 1992 using Meldas 335 NC system and MR-S servos.

I did replace all electronics including servo motors and ballscrew encoders. The only think that is still on the machine is the spindle motor and spindle driver.

I did use Mitsubishi MR-J2S-B fully closed loop servos with YSSC2P SSCNET card .
In order to reach the necessary I/O for retrofitting I use a FX3u-80MT PLC with MODBUS RTU.
All the I/O that are handled trough MODBUS have a delay of around 60ms. Because of that all the high speed I/O were connected directly to the YSSC2P card.

The machine is functional except ATC carousel and the tool probe.

Mazak use a pneumatic tool probe arm witch contains a plunger with two inductive sensors.

After first sensor is tripped the Z axis should decelerate to a low sped before tripping the second sensor connected to motion probe sensor.

Until now I use Gmoccapy with tool sensor on another machine and woks fine .
For Mazak I would like to implement the automatic deceleration on Z axis instead of fixed setup position deceleration.

Can I do the next features without using ClassicLadder :

1. Extend & retract of the toll sensor arm , pneumatic valves are connected to the PLC output
3. Validation of the motion from point 1 using the pneumatic piston magnetic switches that are connected to the PLC input.
3. Z axis deceleration when first inductive sensor is tripped , connected to the PLC input

What is the best approach?

Razvan

You can always avoid classicladder by stringing together HAL components or writing a custom component.
Why do you wish to avoid classicladder?

motion.adaptive-feed may be useful for the slowdown effect.
linuxcnc.org/docs/2.7/html/config/core-c...html#sec:motion-pins

Chris M

Hello
For me is enough having one FX3u PLC on the machine. It was not easy to connect it using MODBUS RTU to Linuxcnc.
I do not know ladder logic programing at all.
I need a example of how to extend/retract the sensor arm. I have the I/O pins mapped in linuxcnc with Modbus from the PLC.
Razvan

Could you tell me how you made the ini file with the plc fx3u settings? I'm trying to use it, but I can't communicate

it was a long time ago, but afair in the end we ditched fx3u. couldn't get any decent update frequency out of it using modbus. i believe modbus is implemented in ladder somehow and is very slow. maybe it can be better if someone implements the native mitsubishi protocol. shouldn't be too complicated i think