Servo MR-J4-_A-RJ Control mode

[Ninza T]

Hi all, 

Currently, I have plan to using MR_J4_10A_RJ control by Modbus-RTU.

During read manual of this servo driver I see Mitsubishi offer many control mode.

Can any one have help me to distinguish "Position control" and "Positioning" ?

 

[GreenMan]

Hi

In position control the servo follows the command pulse signal from for example a PLC.

In Positioning mode the servo is controlled internally. Point table is a table with pos, speed, acc, dec ..... values and can be executed by DIO. Program mode is small programs also controlled by DIO. Indexer mode is a rot coordinate. These three modes can be controlled by communication.

Remember to init the servo amp in Parameter PT34 when using positioning mode.

[Ninza T]

Thank GreenMan, 

I'm still not fully understand, my concern is:

If i'm using Modbus-RTU to control this servo driver then "Position mode" or "Positioning" still available -> I can used command to control both "Position mode" and "positioning".

In positioning, i can write specific value to No of table: Target position, speed, acc, dec -> I can control one table no (Example table no 0) like "Position mode".

Pls help to correct me if i was wrong.

When i need to used "Position mode"/"Positioning" incase i control servo driver by Modbus-RTU.

[glavanov]

Check switchable modes in section 5.2 from here: https://dl.mitsubishielectric.com/dl/fa/document/manual/servo/sh030175/sh030175b.pdf

I think you can't switch between positioning and positioning mode (table/program) with modbus

Check section 2.2 for the restrictions...

[GreenMan]

Modbus-RTU can't controm the servo in position mode. To control the servo by Modbus-RTU positioning mode is your only solution.