Hello Together,

If I add value "0.192" to a REAL every pulse, then summation is stopped at the value "4194304.0". Please, can you help to solve this?

CPU is  CPU 317-2 PN/DP (6ES7 317-2EJ10-0AB0 /v2.3).

And how many pulses you'd like to count? Up to ifinity? Then it's gonna be quite challenging.

Simple solution - as often simple solutions are, it's quite limited but maybe it will be enough in this case:

Start with building a counter based on a DINT data type. I.e. each pulse increment it by 1.

For displaying use different variable of a REAL type.

Take the count, convert it to REAL, multiply by your magic number.

But you must be aware - the counter will overflow after 2**32-1. Max readout - 412 316 860.416. However only first 6-7 digits can be shown. I.e. if you have 1 pulse each milisecond, it will overflow after ca. 49 days.

You may be interested in further reading.

Hi,

please check the following FAQ - ...better use DINT...

How do you check real numbers for parity?

Regards,

Towome

If you calculate with floating point numbers, the calculation result is rounded to fit in the data type format.

A REAL number is a 32 bit value. It has 23 bit mantissa 1 bit sign and 8 bit exponent (base 2).
In base 10 system, this correspondents to a mantissa of 6 or 7.

Depending on the PLC type you can use LREAL or you have to switch to DI.