Which instruction would work best

1knarf · Feb 22, 2021

Hi,

trying to explain my situation as simply as I can. I want to use
a numeric entry in my panelview to load a specific number to an integer in my plc program. basically a move function and the panelview numeric entry as the source. not sure what instruction will do this for me. any help will be appreciated. thanks

parky · Feb 22, 2021

Perhaps a MOV Instruction ?, do you need to move it, is there a reason you could not just use the address where the integer is stored in the PLC ?.
Your question is a bit vague.

Steve Bailey · Feb 22, 2021

You shouldn't need any instruction in the PLC logic. The HMI can write directly to any address in the PLC.

1knarf · Feb 22, 2021

sorry about being vague,had to start somewhere. I'm using this to setup limits in my program so I only what this function to be enabled in a specific mode.

Operaghost · Feb 22, 2021

The PV can write directly to a tag without needing to create any logic in the PLC.

Once that value is stored in a tag, then you can use instructions like the LIM, EQU, NEQ, GRT, GEQ, LES, or LEQ to check the value to verify it is an "acceptable" value.

OG

Steve Bailey · Feb 22, 2021

Many, if not most HMIs will let you set limits on the data entered. But if you want to set the limits in ladder logic, use a comparison followed by a MOVE.

If HMI_Entry > HI_Limit, MOVE HI_Limit ---> HMI_Entry

The exact format of the logic will depend on your PLC model and its instruction set.

Which instruction would work best

1knarf

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parky

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Steve Bailey

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1knarf

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Operaghost

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Steve Bailey

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