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Codesys ST CASE statement

Created: 2022-07-19

Updated: 2022-07-19

Hi,

Below I paste one of step CASE statement

    21:   (*check number phone sender'a*)  (*check if sms is not too old*)
        timestamp_hist_hi := time_sys.udiLocal_DateAndTime + timestamp_hist;
        timestamp_hist_lo := time_sys.udiLocal_DateAndTime - timestamp_hist;

        IF  (smsrec.sNumber = 'XXXXXXXXXXX' OR smsrec.sNumber = 'XXXXXXXXXXX')  AND
            (DT_TO_UDINT(smsrec.dtSend) > timestamp_hist_lo)                    AND
            (DT_TO_UDINT(smsrec.dtSend) < timestamp_hist_hi)                    THEN
                iState:= 23;
        ELSE
                iState:= 100;
        END_IF;

Teh variable timestamp_hist equal 300sec.

How it is possible that time to time the variables timestamp_hist_hi and timestamp_hist_lo are the same ?

TimvH - 2022-07-19

When timestamp_hist = 0

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Codesys ST CASE statement