Another New User

[Vernon Leeper]

Edrum fixed timers, thier all fixed in the drum right? So would you use the V registers from the drum's timers to adjust?.....I'm confused..
I would have to see it kinda thing to see how it worked.
I like B's ideal, I did it in stage so that it would ignore the previous step unless a condition called for it to return to a stage. For me, the stage was an easy way to do it. I put a momintary push button on the panel, like a stop button, that instruction would allow it to return to "home" in any stage that it would be in just in case. Sometimes the opperator or the setup tech would forget to do something, they could hit this button, do what they have to and restart the cycle.

[Controls Guy]

No, there's no V-registers associated with the times you actually type in to the drum, those have to be K-values.

I'm saying to make the event (EDRUMS allow both a time and/or an event -- C, X, Y, T, etc., for the completion of each step) either a C-coil or a timer T-bit.  Then in the ladder after the drum, set that C-bit with some logic that involves a normal timer, T100 lets say.  Then T100 can have V2000 or whatever as its setpoint, and V2000 can be set from the MMI.  When T100 runs out, its output bit, T100, is either the event that allows the drum to index, or is involved in some logic that ends up setting a C-coil which allows the drum to index.  But you have to use the type drum that will accept an event to index.

Here's a sample to clarify:

[Vernon Leeper]

Looks too simple, I'm over complecating it in my head. I don't have an HMI to try this with, can I use switches or momentary push buttons to test with?

[Controls Guy]

You certainly DO have an MMI.  It's called "DirectSOFT"!   

Write the EDRUM and associated logic the way you want it with V's as setpoints for the timers you want adjustable.  Then test by using DirectSOFT to put values into the V's that represent the timer setpoints.  If it works with values stuffed in from DirectSOFT, it'll work when values get stuffed into the same registers from an MMI.

Or, you can use a PC-based Modbus master utility on your computer and use that as your "MMI".  Make sure if you use this method, you connect to Port 2 and that it's configured to accept Modbus requests. (Or use an H0-Ecom).  I like the one from Modsoft.co.uk.  It does both Ethernet and RTU, and it's like $15, as is the slave version.

[milldrone]

Looks too simple, I'm over complecating it in my head. I don't have an HMI to try this with, can I use switches or momentary push buttons to test with?

Vernon,

Here is another way to look at this.
http://www.plctalk.net/qanda/showthread.php?t=21781&highlight=simon

[Vernon Leeper]

I've have visited that site, have it book marked, not a member yet, I'll join later. I'm going to write the drum and see how it turns out, let y'all know the out come.