difference between S7 and RS500 timers

[Kyle Sleiman]

whether time counts down or up it makes no difference,

when time elapse the done bit state in any plc will be changed to high.

unless you are using a comparator instruction to create a sequence based on timer CV value (inaccurate system, unless you use interrupt events) then I don't think you should concern your self of how a timer times out.

having said that, can't you write a one rung code and debug online in your S7 software to see if the CV of the timer is going up or down ?

Kind regards.
Kyle Sleiman

 

[Jeebs]

The timer value gets shown in the Indirect column when viewing in STL.
It will be in the following format:

yxxx

y = Timebase
x = REMAINING timevalue


If you L T33 however, only xxx is loaded into ACCU1. As an integer.
This means that yes, for the first 65 count downs, M21.0 will be TRUE.
As long as your time base remains 0, it'll be 65 x 10ms = 650ms.
If your timebase goes to 1, it'll be 65 x 100ms = 6.5sec
And so forth.

 

[JesperMP]

Jesper, you did one "junior dont" in here

Oh dang, I missed that it was S7 to AB, not the other way around.

If the S7 program is 100% in ladder it will be smooth sailing. If it is in STL, then it will be a struggle.

 

[TurpoUrpo]

Oh dang, I missed that it was S7 to AB, not the other way around.

If the S7 program is 100% in ladder it will be smooth sailing. If it is in STL, then it will be a struggle.

Worst part seems to be that he has program as PDF only...