what happens to the state of bits outside of a JSR

[drbitboy]

When I no longer call a JSR (usually for a mode segment change or the running time ends of the light show) I run through the subroutine one last scan turning off all the outputs then set a Skip_Bit on the last rung if the routine isn't enabled.

Is the caller executing the JSR unconditionally?

 

[TheWaterboy]

Okie
Yep, that's what I'm thinking too.

DrBit
That's just what I'm thinking is occurring. I've been beaten by this last-change-wins scenario before. In this case it could be it was taken advantage of.
Not unconditionally, a counter determines which JSR is called. It increments one time when all pumps stop.

 

[drbitboy]

Also, since one case is (Compact- or Control-?) Logix, and one is PLC-5, are we sure that the code is functionally identical?

 

[TheWaterboy]

DrBit
I have no identical code on a PLC5 to compare - I just recall how it worked

 

[I_Automation]

Is the caller executing the JSR unconditionally?

No - only when running that mode and one last scan until the Skip_Bit is set for the JSR, then the sequence moves on to the next JSR or shuts off at the end of the night.