First program reading analog input

[jacksonb 0]

Hello, I want to write a program that will respond to a voltage received by the analog input (channel 1) of an Omron PLC. I am using an Omron CJ1M, CPU22 with CJ1W-AD041-V1 analog input module and the CJ1W-DA041-V1 analog output module. Using a 0-10VDC analog voltage source. My knowledge of the analog inputs and outputs is very limited eg. I believe I need to sent a MOV(021) command to copy the value of the analog input (eg CIO2001=input channel 1) to memory (eg D0). I also use MOV(021) to copy a value from memory to an analog output (eg CIO2011=output channel 1). I believe I also need send a SET command to send a '1' to 2010.00 to enable channel 1. Edit: I think I was trying to run before I know how to walk! To start with, I'd like to know how to set a contact to high if the voltage input into channel 1 is between 5V and 7V. Thank you. Edited 2 Sep 2015 by jacksonb

[BobB 58]

Basically correct. You can set your high and low points in the card setup by the way.

[jacksonb 0]

When you say in the card setup, is this within CX-Programmer? I'm in a learning environment so shouldn't make any changes to the hardware setup, only load and test software. Edit: Sorry BobB, I think my first question was a step or two too far for my present knowledge level. I don't actually know how I would set a contact to high if the analog input is in a given voltage range. Edited 2 Sep 2015 by jacksonb

[BobB 58]

Yes, in the I/O table where you set up the card. The anaolgue card reads, say, 0-4000 - you just have to work out your levels from there. Alternatively you can scale the input - there is a good function block in the downloads are - I nromally do not bother but just work with the raw numbers.

[Crossbow 294]

You set a bit high based on the value using a simple compare. If the value coming in is over a certain value which you need to decide, then turn on an output coil.

[jacksonb 0]

Thank you. I guess this is a function I would use within CX-Programmer and one of the manuals would explain how to use it?

[BobB 58]

My apologies - I am leading you astray! I am thinking about the older cards which I have been working with lately where this facility was available - it is not in the new cards. You could have a look at either of these for scaling http://forums.mrplc.com/index.php?app=downloads&showfile=523or http://forums.mrplc.com/index.php?app=downloads&showfile=996 for scaling - you could them use the compare functions > or < for your high and low alarms. A seniors moment!

[jacksonb 0]

Hello, I am using an Omron CJ1M, CPU22 with CJ1W-AD041-V1 analog input module and the CJ1W-DA041-V1 analog output module. I'm trying to understand how to use the SCL(194) command. What I need to give the command is four values: Minimum scaled value in BCD Minimum unscaled value in Hex Maximum scaled value in BCD Maximum unscaled value in Hex Edit: I think I now understand it now. For the minimum values I can give #0 as I want 0V converted to 0%. For the maximum scaled value I enter #100 as I want it to be 100%. For the maximum unscaled value I set it to 0FA0 as that is the maximum analog input value (if I'm reading the manual right). I realise there are scaling function blocks that will do all this but I'm interested in learning how to use this function as it seems to involve some fundamentals that I should know. Edited 4 Sep 2015 by jacksonb

[banker 2]

Look in the download section there is a function block for scaling Banker

[PdL 71]

Please don't open multiple topics and send PM to users on the same subject... I have merged the topics here.