Application of the Totalization function in S7-300

Martins_Eng

People have to do the aggregation of the flow of water, and I'm using this function that is within the OB35, please see if this correct and comment on the application, it will totlização for the operator to see when water passed through the pipe.

hdhosseini

Martins_Eng

People have to do the aggregation of the flow of water, and I'm using this function that is within the OB35, please see if this correct and comment on the application, it will totlização for the operator to see when water passed through the pipe.

Hello Martins_Eng,

It is working fine as I have tested.I have encountered
same issue several times here ,same issues with FB100
as you have done. The only change I suggest would be
deleting the "M100.2" ,the CPU clock memory,Is it necessary
to use it there?

Best regards,
Hamid Hosseini

hdhosseini

Hello again,

You have developed your codes base on the following topic
and also used the same function (FB100).

How can you accumulate physical flow measurements (e.g. mass flow rate, flow velocity) to an overall value?

As I remember Flow measurement should include rate and
it is for sure a value of quantity on time (such as m³ /h).So,
while installing a Flow transmitter, consult an instrument
technician for proper LRV and URV of transmitter.

As it is clear by checking codes inside FB100, it does not
change the dimension of input value (m³ /h as input and
m³ /h as output).But, I still believe you codes are working fine.

Best regards,
Hamid Hosseini

if there is a function f(x) that is integrable over an interval [a,b] that the average of that function is equal to the integral from a to b divided by (b - a).

hdhosseini

Hello again,

To explain it again, I need to refer to my basic
Knowledge of Calculus.When you calculate"Integral"
of a signal of a period of time, you change the type
of signal as I already mentioned the dimension of physical
signal changed.Integration of "acceleration" gives us
the velocity signal.But in Totalizer,you just accumulate
the physical signal without changing the signal.It is clear
from the following codes." #tCYCLE" and #tINTERVAL are
originally of data type TIME and as they cancel their effect
at each cycle they are not properly converted to TIME .

Again, I support Totalizer will not change the input signal
type and just calculate a average signal of input.

if there is a function f(x) that is integrable over an interval [a,b] that the average of that function is equal to the integral from a to b divided by (b - a).

L #VALUE L #tCYCLE *R //Riemann integral L #tINTERVAL /R L #ACCUM //calculating average +R T #ACCUM T #TOTAL

I hope this helps a bit!
Best regards,
Hamid Hosseini

hdhosseini

Martins_Eng

Dear Colleague in FB100 saw the value of T # 1M to cubic meters per minute but could not understand his explanation of the function on the integration OK but the application of this function directly to a total flow in cubic meters per hour did not understand.

Hello again,

I hope this is what you ara talking about:

The associated physical units of the measured value "VALUE" are, for example, meters per second, cubic meters per minute or kilograms per hour. For the input variable "INTERVAL" you must enter the interval time for the physical unit. Example:

Physical unit	Input for "INTERVAL"
Meters per second	T#1s
Cubic meters per minute	T#1M
Kilograms per hour	T#1h

The only final point I can mention,agreement between time in
input value and interval is only for correct weighting while calculating
average in "Totalizer".



Hope this helps


Best regards,
Hamid Hosseini