Use an Encoder with 120VA Micrologix 1200.

gzPLC · Oct 30, 2018

I want to use 24vdc encoder with an existing micrologix 1200 PLC,

The plc inputs are 120vac, I need 120vac for my other inputs.
So is there any way I can have 24vdc high-speed inputs for the encoder and rest all 120vac inputs?

How should i make this work?

Thanks

gclshortt · Oct 30, 2018

https://literature.rockwellautomation.com/idc/groups/literature/documents/um/1762-um001_-en-p.pdf

Put an expansion card on the unit rated for 24vdc.
See 1762 Expansion I/O in the above manual.

Regards,

gzPLC · Oct 30, 2018

Hi Gary, I went across the expansion Input module, but I don't think that they can be used as high-speed inputs for the encoder.

Any Idea on that?

gclshortt · Oct 30, 2018

If the scan of the PLC is not quick enough for your application, you will have to get the correct CPU with the built in HSC. (DC inputs) Expansion IO can then be added for the AC input points.

http://vdt-automation.ru/files/hsc_quick_start.pdf

Regards,

roxusa · Oct 30, 2018

Depending on the application the encoder is for, I use an anilog laser for position feedback
1762-IF4 Module

Ken Roach · Oct 30, 2018

is there any way I can have 24vdc high-speed inputs for the encoder and rest all 120vac inputs?

Not with this model of MicroLogix 1200 controller. The models with 120v AC Inputs cannot use any of the high-speed counter functions because the physical input circuitry cannot accept 24V fast signals.

What is the encoder's purpose and function ?

gzPLC · Oct 31, 2018

I m using the encoder to control the motor.

Read the encoder and tell the motor when to stop.

Can I use micrologix 1200 itself as has 24vdc high-speed input?
I m thinking of using 1762-L24BWA which is 120vac which supports 24vdc inputs(look for the attachment).

and use "1762-IA8 8-point 120V ac Input" (Look for attachment) for my 120VAC inputs.

Does that look ok?

Thanks

Ken Roach · Oct 31, 2018

Yes, if you choose a MicroLogix controller with DC I/O, then the high speed counter features are built in to the first few inputs.

The MicroLogix 1200 has only one HSC, I think, so it uses Inputs 0,1,2,3.

Then you can power the controller with 120V AC, and use an expansion module for your 120V normal inputs.

Helliana · Oct 31, 2018

If you are going to replace the processor anyway, I would HIGHLY suggest buying either a Micrologix1100 or Micrologix1400 instead. There is little to no extra work in converting your program, and you will gain ethernet connectivity and online edits.

gzPLC · Oct 31, 2018

Helliana, what you say makes sense I will use micrologix 1100.

You said I need to make changes in the program...
Am i supposed to change anything apart from I/O configuration?

Thanks

OkiePC · Oct 31, 2018

gzPLC said:
Helliana, what you say makes sense I will use micrologix 1100.

You said I need to make changes in the program...
Am i supposed to change anything apart from I/O configuration?

Thanks

Do a save as first and give it a new name. Then double click controller properties and change the processor selection to the ML1100.

The software will prompt you to resize data tables and clear I/O. I usually untick the resize data tables option but I often have a lot of spare data tables marked and commented that I want to keep.

If you are switching from a ML1200 with more onboard I/O than the ML1100, you may want to search and replace those that fall outside the limits of the new hardware.

Use an Encoder with 120VA Micrologix 1200.

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