DRUM Instruction Fails in Simulator (Sometimes)

[Mike Nash]

Do-more Simulator does not run DRUM properly - it never starts but it tests just fine in an actual H2-DM1E.

I discovered this little issue while trying the "challenge" here:
http://forum.automationdirect.com/showthread.php?t=14293

I thought I was being especially dense as I could get some variants to work but had to jump through hoops. (Like Step one being a 1mS timer and X0 having to be a C0.)

Also, the help for Drum mentions a "Start" Input in the
"Important Note: The outputs specified in the Drum instruction are enabled any time the Do-more controller is in Run Mode - the Start input does not have to be ON ..."
but there isn't one - it's a Run.

Any plans to get the Drum editor to be more friendly? Like cut and paste or insert step or stop exiting after every <Enter>.

Code: [Select]

// Options: Export entire program; Code Block delimiter instructions;
// Unformatted Rung Comments; Element Documentation Database;
// System Configuration; Memory Configuration/Devices with User Add-Ons only;
// use Element names (no NickNames); rung/address annotations;
// <SPACE> parameter delimiter;
// Write/overwrite file C:\Do-more\Designer1_3\Projects\Drum Failure in Simulator Only.txt

PLC DM-SIM

// Do not modify SYS_CONFIG block!
#BEGIN SYS_CONFIG
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#END

#BEGIN MEM_CONFIG
 DRUM_0 DRUM  0
#END

// Beginning of Code Block $Main
$PRGRM $Main

// Rung $Main#1
// Offset 0
STR ST1
STR ST2
STR DRUM_0.Done
ANDN X0
DRUM DRUM_0 1 DST511 "3 DST511 X0 0x1 V0 ST1023 0x0 V0 ST1023 0x1" "1 Y0"

// End of Code Block $Main
$PGMEND $Main



[Mike Nash]

Well...

I just tried the program above in the simulator on my work computer and it works just as it should. I tried multiple times at home without success.

So what was I screwing up?

[BobO]

Can't say. The code is exactly the same for both though. Could be a more generalized problem with the simulator and not something specific to DRUM.

As for editing quirks...comments Mark?

[Mike Nash]

I did not clear the memory on the simulator (either computer) before deleting and adding rungs from previous testing. Might this cause it? (I have seen this be an issue with D2-260s before with weird behavior.) I'll try that at home later.

Another Help thingy - the Optional Drum Output Masks shows D1-D14, but the instruction only allows you to type in one address with the rest implied I guess as that is what I saw happening.

[BobO]

We try hard to prevent it, but yes, there are cases where a retentive value in the image register can get stuck in such a way as to cause trouble. I'm pretty certain this is only in cases where the memory map is changing...old stuff in memory getting mapped to new locations. But as a general rule, it is best to flush the memory when starting something new.

That said, if anyone can demonstrate a case where an instruction gets stupid and it isn't a case of changing memory config without clearing the image register, we really need to know it.

[franji1]

As for editing quirks...comments Mark?

We can definitely look at them.

[Mike Nash]

Just a follow up - clearing the simulator PLC Memory did solve the issue with strange Drum behavior.

I had simply deleted a bunch of heap items prior to trying the Drum instruction.

[LWgreys]

I tried out this example and found that on the first scan the drum started its cycle before the X0 value has been read which was off at the time the drum cycle was loaded without clearing the memory. After the first initial run the drum will run correctly on each Terminal to Run cycle.

I suggest putting a FIRST_SCAN ST0 NC contact in the RUN line to prevent the drum from starting during the first scan.