Map Physical Input and Output to Word

[simonongsk]

How to map physical Input and output into variables type of Word?  It is easy in CX programmer with Mov 0 to  Inp_Word_0  (type Channel)

Global Variable  -----> Inp_Word_0 ,      Inp_Word_1     Type Word

                                      Out_Word_0,        Type Word                          

Example in NX1P2   map Input Bit 00 to Input Bit 15 to a Inp_Word_0,     and    map  Input Bit 16 to Input Bit 23 to a Inp_Word_1

                                     map Outpu Bit 00 to Input Bit 15 to a Out_Word_0, 

 

 

                                 

 

[Michael Walsh]

You have to make a union.    See below:

First, make a union under data types like this:

Then create a variable that is of the type that you created:

Then use the variable as both a bit and a word like this:

You can ignore my comments about VB in the ladder, this was an example that I did for someone else. 

[simonongsk]

I am using the above method, I thought there is a more simple method instead of writing bits to bits. Is there a way of assigning a variable at IO Table directly with the union variable?

 

[Crossbow]

Elements of a union or structure (with the period in the name) cannot be used in the I/O Map.

[Michael Walsh]

On 7/16/2019 at 7:19 PM, simonongsk said:

I am using the above method, I thought there is a more simple method instead of writing bits to bits. Is there a way of assigning a variable at IO Table directly with the union variable?

 

Just assign a word variable to the input channel (in my example, I am using an input card) and then put a move instruction in the first rung of code that moves the input word variable into the unionVariable.word and done.

Of course output words would be at the very end of your program and you would be moving from the unionVariable.word into the output word.

[simonongsk]

It will only work if I am using modular input and output . But I am using nx1p2. There is no channel as compare to Cp1e

[Michael Walsh]

Ah, then unfortunately you will have to do it bit by bit at the beginning of the code for inputs and at the end of the code for outputs.