How to use memorylocation %m

2020-02-27T22:54:58.265000Z

Maybe this will help. This is an excel sheet with how the memory is aligned. Like Shooter said not all PLC/HMI align the memory the same. This sheet is based off SoMachine/Vijeo hardware built by SE.

SoM Modbus Table.xls [418.5 KiB]

How to use memorylocation %m

2020-02-27T22:54:53.643000Z

yes it is a known location , and you when having several PLC in a communication like the old MODBUS you can ask any plc for a memory location and get its results.
Many HMI displays work with these MARKERS.

How to use memorylocation %m

2020-02-27T22:54:52.034000Z

Hi,
Thanks for the reply.

What is the difference between

sarath:array [1..10] of DWORD; and myDwordArray AT %MD0 : ARRAY[0..10] OF DWORD;

Is it just that %MD0 is known location?

Thanks

How to use memorylocation %m

2020-02-27T22:54:47.616000Z

They can declared anywhere in declaration. Below are examples

myBool AT %MX0.0 : BOOL; //Boolean Type
myInput AT %IX0.0 : BOOL;
myOut AT %QX0.0 : BOOL;

myByte AT %MB0 : BYTE; //Byte Type
mySINT AT %MB0 : SINT;
myUSINT AT %MB0 : USINT;
myByteArary AT %MB0 : ARRAY[0..10] OF BYTE;

myWORD AT %MW0 : WORD; //16 bit types
myINT AT %MW0 : INT;
myUINT AT %MW0 : UINT;
myWordArary AT %MW0 : ARRAY[0..10] OF WORD;

myDWORD AT %MD0 : DWORD; //32bit Types
myDINT AT %MD0 : DINT;
myUDINT AT %MD0 : UDINT;
myReal AT %MD0 : REAL;
myDwordArray AT %MD0 : ARRAY[0..10] OF DWORD;

mySTRING AT %MB0 : STRING; //STRING

How to use memorylocation %m

2020-02-27T22:54:46.030000Z

same place as you would do with the in and outputs

I tend to put them all global so i can see and change them anywhere.

How to use memorylocation %m

2020-02-27T22:54:41.599000Z

Hi,
Can any give me an example of how %M is used in the program,means where I have to declare this ?

Thanks

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