Shift Register for the Bytronic ICT3

mitureg · May 31, 2013

Greethings everybody. This is my first thread so bare with me. I am a PLC enthusiast, just started a few months ago.

I got a question with regards to shift register in RSlogix.

How is it possible to trigger an output with a shifting bit in a register. So far here's what I have:

Figure 1 (see attachment)

Each time IP4 is energized it shifts the content of the bit address B3:1/1 to the right, as a clock.

Now, when (or how) can the content of an address be used to trigger an output? Let say, of the top of my head, that one possibility would be to have an output triggered when a bit reaches a position in the file #N7:0. As it starts from the left at position N7:0/15 (of a 16 bytes word), can it trigger an output when it reaches N7:0/1 ?

Is there a more versatile way to trigger an output from a bit within a shift register, no matter where it is in the register?

Thank you :site:

Anirban Hazra · May 31, 2013

mitureg said:
Now, when (or how) can the content of an address be used to trigger an output? Let say, of the top of my head, that one possibility would be to have an output triggered when a bit reaches a position in the file #N7:0. As it starts from the left at position N7:0/15 (of a 16 bytes word), can it trigger an output when it reaches N7:0/1 ?

That can be done as simply as this:



| N7:0/1               O:0.0/1

|--| |-------------------( )

mitureg said:
Is there a more versatile way to trigger an output from a bit within a shift register, no matter where it is in the register?

..and that can be done like this:

|  +--------------+                 O:0.0/1

|--| NEQ          |-------------------( )

|  |Source A: N7:0|

|  |Source B: 0   |

|  +--------------+

Could you explain your application? I'm asking because maybe there could be a simpler way to achieve your goal without having to use BSR.

mitureg · May 31, 2013

Thank you for your fast reply.

It's for a Bytronic ICT3 Industrial Controller Simulation.

Here is the specs in attachment.

Here's a demo:
http://www.youtube.com/watch?v=IimTDCz5J4Q

Is there a simpler way to track the moving parts?
What would be the standard way of doing this?

Thank you very much Anirban Hazra.

Anirban Hazra · May 31, 2013

mitureg said:
Is there a simpler way to track the moving parts?
What would be the standard way of doing this?

If the application is tracking moving parts then Bit Shifting is the right way to do it.

mitureg · May 31, 2013

Thank you I will try this asap and come back if anything. Regards

mitureg · Jun 3, 2013

Hi Anirban, can you explain a bit more what is the purpose of the value within this NEQ application ? Thank you

Code:
Quote:
Originally Posted by mitureg
Is there a more versatile way to trigger an output from a bit within a shift register, no matter where it is in the register?
..and that can be done like this:

Code:

| +--------------+ O:0.0/1 |--| NEQ |-------------------( ) | |Source A: N7:0| | |Source B: 0 | | +--------------+

Anirban Hazra · Jun 3, 2013

You had asked for a way to trigger an output if any of the bits of a certain register became 1.

mitureg said:
Is there a more versatile way to trigger an output from a bit within a shift register, no matter where it is in the register?

If any bit of a register becomes high then it's decimal value as a whole will be no longer be equal to 0.So I suggested using NEQ(Not equal to) instruction to compare the register value with 0. As soon as any bit in N7:0 becomes high this instruction will turn on O:0.0/1.

mitureg · Jun 3, 2013

Thank you. I posted more information in this thread, I am not sure if the NEQ is good for my problem. Can you have a look?

http://www.plctalk.net/qanda/showthread.php?t=79993

Cheers

mitureg · Jun 3, 2013

Should I use the FIFO to trigger a reject once the reject sensor detects a component?

Shift Register for the Bytronic ICT3

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