Addressing I/O by string configuration

2020-02-27T13:48:13.519000Z

Watch this:
https://www.youtube.com/watch?v=cN_Jz9ziUTM m

Addressing I/O by string configuration

2020-02-27T13:48:13.251000Z

There is a free package in the Codesys store for this. That package is very very powerful. I have used this package in a project and using it was a breeze.
Apart from providing a mechanic for free arrangeable IO channels, with different datatypes (BOOL, BYTE, WORD etc etc), it can restore previous made configurations and store current configurations onto disk.

https://store.codesys.com/io-mapping-tool.html
Plus, it's open source so you can take a look inside the library to learn more about it's mechanics

Addressing I/O by string configuration

2020-02-27T13:48:13.169000Z

Another solution

Create an FB_dio.

Inside, put an (which could be static) pointer to array[0..1024] of usint (call him iomem).

Create two persistent vars:

Index:int
Bit:int

In your fb code, if is an dinput.

Iomem:= adr(ib0);

Out:= iomem^[index] and (shl(1, bit))<>0.

Changing index and bit, you can, programaticaly change your map.

Best regards

Sent from my Moto G (5S) Plus using Tapatalk

Addressing I/O by string configuration

2020-02-27T13:48:13.035000Z

What I purposed earlier totaly conforms in your needings.

So step 1 : create a generic plc program that address all I/Os (IO_DI/DOs arrays, Mapping arrays). You can forget about the constants.
Step 2 : create an array for each FB type you will have to use (tank with 1 outlet, tank with inlet+outlet …)
Step 3 : create fb call Inside a loop for each different fb you got, with a independant variable max loop count (1 for each fb type), using mapped I/Os as fb I/Os
Step 4 : just configure your program by whatever way you want (like reading txt file or settings manually values) by settings the right values in ioMap arrays and loop counts (loop count = 0 if you have no instance of this type)

exemple :

// FB calls
FOR index:=0 TO MaxFbTankOneValve DO
   FbTankOneValve[index] (ValveInput:=IO_DI[ioMapDI[0 + index]],
      ValveOutput=>IO_DO[ioMapDO[0 + index]]);
END_FOR;
FOR index:=0 TO MaxFbTankTwoValves DO
   FbTankTwoValves[index] (ValveInput:=IO_DI[ioMapDI[100 + index]],
      ValveOutput=>IO_DO[ioMapDO[100 + index]]);
END_FOR;

Assuming you will later set :
MaxFbTankOneValve as the count of instances of tanks with 1 valve
MaxFbTankTwoValves as the count of instances of tanks with 2 valves
ioMapDI[0] + MaxFbTankOneValve to the correct inputs indexes of tanks with 1 valve
ioMapDO[0] + MaxFbTankOneValve to the correct outputs indexes of tanks with 1 valve
ioMapDI[100] + MaxFbTankTwoValves to the correct inputs indexes of tanks with 2 valves
ioMapDO[100] + MaxFbTankTwoValves to the correct outputs indexes of tanks with 2 valves

Edited for code correction

Addressing I/O by string configuration

2020-02-27T13:48:12.948000Z

a plc on a site must manage for example a tank with 1 valve (output) and 1 feedback (input)
a plc must manage a tank with 2 valves (2 outputs) and 2 feedbacks (inputs)
a plc must manage two tanks with 1 valve each and 1 feedback each (2 outputs and 2 inputs)

in my idea I will develop only one application delivered to all plcs and send the plcs to the destination, remotely I will put the txt file and the application will arrange dynamically the addressing, that is my need
a text file like
I0.0
I0.1
I0.2
....
O0.2
O0.3
and the plc will address the relatives I/O.
if some input or output gate is going out for some reason a qualified person could switch physically to another and I remotely could change the txt file addressing correctly the new one.

Addressing I/O by string configuration

2020-02-27T13:48:12.881000Z

give us at least 3 exemples sites

Addressing I/O by string configuration

2020-02-27T13:48:12.812000Z

No no, maybe I'm not so clear...

I have to deploy many PLC in different sites.
Every sites can have a different configuration in term of I/O.
So the idea is to write one time the generic application program and configure the behaviour by a TXT file read at startup.
In the past I managed something like that but for parameters only, not for I/O.
So I need to be able to configure dynamically this I/O.

Addressing I/O by string configuration

2020-02-27T13:48:12.737000Z

So you mean, you have different number of process instances ? -> just do a loop call for each instances, with variable count.
this exemple totally conforms with your needings, assuming you write by yourself TXT file reading and values setting from it (functionnal mapping, number of instances …)

Addressing I/O by string configuration

2020-02-27T13:48:12.643000Z

Hi,
it is not my situation.
Let me explain in deep.
I need a solution to address the I/O on different systems that may differ between them.
For example one system may have only one valve and a feedback and the other may have three valves and some other feedback. The main program must be the same but via txt file I would like to "configure' the behaviour of the system, so a dynamic block could address different I/O based on the file.
I don't have to modify the application program. Just download to the destination PLC, change the txt file and... that's it.
Thank you

Addressing I/O by string configuration

2020-02-27T13:48:12.516000Z

To correctly map your inputs to the wired inputs, just change the value of :
IoMapDO[MAP.PUMP_RUN]
IoMapDI[MAP.PUMP_REQUEST]
IoMapDI[MAP.PUMP_FAULT]

to the index of your input.

Sample project attached.

For more code readability, but requiring more treatment, you may also copy every IO_DI/DO array value to the right tag (adding one more layer, but every access will have the same tag)

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