CLX 101 question

hanlonmi06

Member
Join Date
Jul 2011
Location
Ann Arbor
Posts
33
How does the clx platform handle rung executions?

By that i mean, if for example, you have a time based task in your project along with continuous tasks, does the current rung that the processor is on finish executing before leaving the continuous task and executing the time based stuff, or will the jump just occur at any place?
 
it is as you said: "AT ANY PLACE" ...

actually logic can be interrupted even part way through an instruction (for example: part way through an ADD instruction) ... there's an example program in the two or three posts which start at the link below ...

http://www.plctalk.net/qanda/showthread.php?p=376167&postcount=61

you'll probably want to read up on "priorities" if this type of stuff is important in your projects ...
 
ok, wow.

the assumption then is that the processor returns to exactly where it left off.

i will read that posting, for sure, and perhaps the answer to the next question is in there, but is it possible to have logic written in such a way as to be negatively affected by that nature of leaving a rung?

i don't have a specific situation im trying to fix or understand, but i did run into a situation of loosing track of data being written both by program logic and some OPC server joyfullness from out esteemed colleagues in IS.
 

Similar Topics

Controller: 1756-L84E v.35 Prosoft MVI56E-MNETC for ModbusTCP/IP I'm having an issue with some of my write commands. The write command that...
Replies
0
Views
195
I have several Avery scale units and they are configured as Generic Ethernet modules, and I am actually reading the data fine for the weight...
Replies
2
Views
420
What's the best way to move a tag value from the panelview+7 to the clx plc. We display amps from a power meter on the panelview screen, read in...
Replies
1
Views
398
I'm running into an issue migrating a PLC-5 using the newer Logix Designer Export when opening a saved .ACD from RSLogix-5. It has multiple RIO...
Replies
2
Views
617
We have two sites that are stranded with no line of site, they are handled by phone/modem with a chain that includes: Stranded site (client)...
Replies
5
Views
909
Back
Top Bottom