nathan.slade
Member
can someone explain to me how to read analog values in a ml1200 from a slc through dh485. i have both connected to aic+ and both are seen through linx. the ml1200 is node3 and the slc504 is node2.
reading analogs in ml1200 from slc504
- Thread starter nathan.slade
- Start date
sthompson
Lifetime Supporting Member + Moderator
While you might be able to read the Analog Value directly from the Input Channel. I would copy it, or a Scaled version of it, into an N Memory location.
Then I would use a MSG Instruction to read the N Memory in the ML1200 into the SLC.
Stu....
nathan.slade
Member
OP
i have moved my inputs to n:7.0 to n:7.3. i need to move these to my slc. At this point my slc is only gathering data for my simple rsview32 display and panelview.
sthompson
Lifetime Supporting Member + Moderator
As stated in my first Post, a MSG Instruction will do that for you. I presume you are using Channel 0 on the SLC5/04 connected to the AIC+. Is that correct?
Stu....
nathan.slade
Member
OP
Here is where the problem is, i have never use the msg instruction before. How do i set it up to read the first 4 N files in the ml1200? I have zipped my test file. can you tell me what im doing wrong
sthompson
Lifetime Supporting Member + Moderator
nathan.slade
Member
OP
Sorry for not posting my ladder. I had a few drinks and could only rar it then win zip wouldn't install on the 9gb of free space on my laptop. Could anyone post a example for me to try to copy. That would be great. Slc504 32kb member reading N:7.0 to N:7.3 from the ml1200 through ch0 at 20.4 I think. Will check after work.
sthompson
Lifetime Supporting Member + Moderator
I actually had an example ready to go, but I was expecting a copy of your Ladder, so I closed it. I will make it again.
Make sure you have both Channels set to DH485, and the same Baud Rate and Settings.
Stu....
Make sure you have both Channels set to DH485, and the same Baud Rate and Settings.
Stu....
sthompson
Lifetime Supporting Member + Moderator
Your Message Setup should look something like this. Change the Target Data Table Address to where you want the Data to end up.
Stu....
Stu....
sthompson
Lifetime Supporting Member + Moderator
Your Channel Setup should look something like this.
Stu....
Stu....
sthompson
Lifetime Supporting Member + Moderator
One last thing. Make sure you have a Trigger Timer for your Message Instruction. The Message Instruction takes a certain amount of time to Execute, so start with Triggering it every 3 Seconds, and then once everything is working, you can try reducing the Time Delay.
You definitely don't want to Trigger it every Scan.
Stu....
You definitely don't want to Trigger it every Scan.
Stu....
nathan.slade
Member
OP
Thanks heaps stu. Will try it again tonight.
nathan.slade
Member
OP
Thanks again stu.
I was just reading this all again and I can remember I was having trouble with the control block on the msg instruction itself. Can you please explain this to me in simple terms. I have tried the help menu but just get confused. Thanks again
I was just reading this all again and I can remember I was having trouble with the control block on the msg instruction itself. Can you please explain this to me in simple terms. I have tried the help menu but just get confused. Thanks again
sthompson
Lifetime Supporting Member + Moderator
The Control Block takes care of all the Housekeeping for the Message Instruction. It is an Integer File 14 Words long. It needs to be mapped to an unused area of Memory.
In the older SLC Processors you had use Integer Memory. (N)
The new ones like the ML1400 have Message Data Types (MG) that is meant for this.
I normally create a new Integer File just for Messages.
nathan.slade
Member
OP
Thanks mate. Things are starting to move forward now. I have a pic i tried to load of the 2 N7:0 files and the strainge numbers im getting at the slc.
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