Upgrade from fx2nc-64mt-dss to fx3uc-64mt-dss

[westwind80]

Hi All,

  I'm new to mitsubishi plc. I am desperate for help.  Please anyone, can help me direct me to the solutions I face.

 

Old Unit configurations : Consist of 1unit plc cpu / X2 units analog input / X2 units analog output. Below are the hardware installation sequence

fx2nc-64mt-dss / fx2nc-4ad / fx2nc-4ad / fx2nc-4da / fx2nc-4da

New Unit configurations : Consist of 1 unit plc cpu / X2 units analog input / X2 units analog output. Below are the hardware installation sequence

left of plc cpu : fx3u-4da-adp / fx3u-4da-adp / fx3uc-64mt-dss / right of plc cpu : fx3uc-4ad / fx3uc-4ad 

 

As per mitsubishi replacement recommendation for the obsolete parts as below :-

plc cpu : fx2nc-64mt-dss => fx3uc-64mt-dss (both with 16kbps memory card installed)

analog input : fx2nc-4ad => fx3uc-4

analog output : fx2nc-4da => fx3u-4da-adp

 

How I did the migration was to :- 

1. copy the plc codes from fx2nc-64mt-dss to GX-developer

2. Saved the projects.

3. Change the "Change PLC Type" in GX-developer from "FX2nc" to "FX3uc"

4. Saved the project again.

5. Moved the wires from old plc to new plc following the same signal channels as the old unit. Meaning from X0 => X0, COM1 to COM1......

6. Upload the new project to the new plc.

 

After completing the task, the plc successfully "Run" without error. The problem is the equipment that is relying on the analog output (fx3u-4da-adp) is not working. Such as the RPM analog meter is not getting the signals. I suspect it has something to do with the ladder diagram after the upgrade. Might need to recode. I have not much experience in ladder diagram in plc. Can anyone guide me please.....I am really desperate for a solution.  Thank you for your time and help.

 

 

[glavanov]

Well... fx2nc-4da i mounted right from the main CPU module and it's controlled and monitored by FROM and TO instructions trough the buffer memory (BFM).

Manual link: https://dl.mitsubishielectric.com/dl/fa/document/manual/plc_fx/jy997d07601/jy997d07601d.pdf

fx3u-4da-adp Is adapter mounted left from the main CPU and it's controlled by special relays and data registers in the main CPU

Section 4.1 from here:https://www.allied-automation.com/wp-content/uploads/2015/02/MITSUBISHI_FX3GFX3U-Users-Manual-%E2%80%93-Analog-Control-Edition.pdf

You have to reprogram it.

In theory you can mount fx2nc-4da to the right of Fx3UC and the original program should work... it's a temporary solution if it's a must to ubgrade to fx3u-4da-adp. You just have to mount it on the same place it was on the Fx2NC to mathc the module number.

This will buy you some time to understand how to reprogram... 

 

 

Edited February 21, 2022 by glavanov

[westwind80]

Hi glavanov,

  Really appreciate your clarifications. Made my planning easier.

Regards,

Wesley

[glavanov]

Glad to help.