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Unitronics M91-2-T38 External Keypad


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Hi,

Im currently working on a project with a M91-2-T38.  The Enter HMI button does not work. I've thought of having external button connected to the INPUT port of the PLC, and using it (in software) to act as the key in the HMI keyboard (see attached image). Is it possible to assign the function of the Enter HMI button to an input?

Thanks In Advance 

KaWu

ss1.PNG

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Hi Ausman,

Yes i tried, but it didn't work. I couldn't set coil. I read this post https://unitronicsplc.com/Download/SoftwareHelp/VisiLogic_Knowledgebase/Ladder/Operands/System_Operands_(SI)_(SL)_(SB)_(SDW).htm I think I can't use SB53 as output. So my question is, is there other way to assign the function of the Enter HMI button to an input?

Thanks In Advance 

KaWu

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Yep Flex, yer probably right, I didn't think about the Keypad Variables, the U90 logic is so basic I usually use them when I just need a simple control with minimum user interface, for anything with user entries I usually step up to a V120.

The repair part is tough to get, although I do have some of the M91 membrane keypads (M90-KEYPAD ?) that JoeT managed to get me a few years back when I had a M91 in an awkward location and it kept getting damaged.

I'm thinking we paid around $30 for the keypad, a lot cheaper than $400 for a new T38

Johnr

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Sometimes it is necessary to do repairs when there are no original spare parts or they arrive for a long time.
You reminded me about the Enter key.
Machine Amada - Enter completely destroyed.
Temporary solution - the external button is soldered to the corresponding matrix keypad conductors.

This may be a solution when it's impossible to fix the program
However, definitely

5 hours ago, JohnR said:

I'm thinking we paid around $30 for the keypad, a lot cheaper

 

keyb_enter.JPG

solution.JPG

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