Parallel loading Omron CJ1 shift register - PLCS.net

Steve Kemp · September 29th, 2006, 05:20 AM

Hi all. Say I'm using address W1 as my starting (and end) words in the SFT(010) instruction; does anyone know whether it's ok to "parallel load" W1 from other sources in the program (set a bit or bits, for example)? I need to look at various stages in a linear array of processes, any of which could generate an output bit, and then track all instances to the last bit in W1 for pass/reject action. Thanks, Steve.

Edit: Hmm, I can see this getting complicated, as I'd have to reset the "set" bits when the next shift occurs and that would interfere with the "next" bit in the register. So... how about a one-shot masked move with the mask arranged to match the station number so only the appropriate bit is loaded?

gtsuport · September 29th, 2006, 07:00 AM

Just a thought, you could DIFU the W1.xx bit with the "shift" bit. You would need the DIFU instruction before the SFT instruction.

Hope this will help.

Steve Kemp · September 29th, 2006, 07:07 AM

Sounds right to me. If I follow you, I'd need to latch the "on" state for the process stage in question and then gate that state via a difu (when the shift operation is required) into the appropriate W1 bit (as a coil instruction).Thanks. Steve.

chavak · September 29th, 2006, 08:12 AM

Steve,

If I get you right, you have different processes to be accomplished to determine the end result at the end of its index.

I would rather use Word Shift for this application. It hold all the actual state of the individual results till the process end.(Easier for tracking/trouble shoot).

A 'W' word can hold up to 16 results, say for example you have 10 indexes before the process complete I may use a block of W words start from say W0 ~ W9.

Regards
_______

gtsuport · September 29th, 2006, 12:12 PM

Steve,

Yes, you understand what I was suggesting.

Let me know if you have any other questions.

September 29th, 2006, 05:20 AM	#1
Steve Kemp Member Join Date: Nov 2003 Posts: 122	Parallel loading Omron CJ1 shift register Hi all. Say I'm using address W1 as my starting (and end) words in the SFT(010) instruction; does anyone know whether it's ok to "parallel load" W1 from other sources in the program (set a bit or bits, for example)? I need to look at various stages in a linear array of processes, any of which could generate an output bit, and then track all instances to the last bit in W1 for pass/reject action. Thanks, Steve. Edit: Hmm, I can see this getting complicated, as I'd have to reset the "set" bits when the next shift occurs and that would interfere with the "next" bit in the register. So... how about a one-shot masked move with the mask arranged to match the station number so only the appropriate bit is loaded? __________________ For the Present is the point at which Time touches Eternity. C.S. Lewis. Last edited by Steve Kemp; September 29th, 2006 at 05:28 AM.

September 29th, 2006, 07:07 AM	#3
Steve Kemp Member Join Date: Nov 2003 Posts: 122	Sounds right to me. If I follow you, I'd need to latch the "on" state for the process stage in question and then gate that state via a difu (when the shift operation is required) into the appropriate W1 bit (as a coil instruction).Thanks. Steve. __________________ For the Present is the point at which Time touches Eternity. C.S. Lewis.

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September 29th, 2006, 07:00 AM	#2
gtsuport Member Join Date: Feb 2005 Location: Grand Rapids, MI Posts: 803	Just a thought, you could DIFU the W1.xx bit with the "shift" bit. You would need the DIFU instruction before the SFT instruction. Hope this will help.

September 29th, 2006, 08:12 AM	#4
chavak Member Join Date: Jul 2002 Posts: 535	Steve, If I get you right, you have different processes to be accomplished to determine the end result at the end of its index. I would rather use Word Shift for this application. It hold all the actual state of the individual results till the process end.(Easier for tracking/trouble shoot). A 'W' word can hold up to 16 results, say for example you have 10 indexes before the process complete I may use a block of W words start from say W0 ~ W9. Regards _______

September 29th, 2006, 12:12 PM	#5
gtsuport Member Join Date: Feb 2005 Location: Grand Rapids, MI Posts: 803	Steve, Yes, you understand what I was suggesting. Let me know if you have any other questions.

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