applying conversions at different times of day

[Ampm]

Hi i am using DAQF to read electricity meters i want to convert the KW reading to pound and pence, the day tarrif can just be multiplied by the appropriate amount but after say 6pm until 8am the tarrif changes how can i split up the channel into different chunks so i can apply different tarrifs at different times of day?

Thanks for any help

[AzeoTech]

I'd probably create a Test channel, called, say, Tariff, I/O type A/D, Timing = 0. Then in the event of the energy meter, put something like this:

private temp
if ((temp.time % 86400 < 8*3600) || (temp.time % 86400 > 18*3600))
   temp = 30
else
   temp = 20
endif
temp.time = meter.time[0]  // meter is the name of the meter channel
tariff.addvalue(temp)

% is modulus and doing % 86400 returns the seconds into the day.

Once you have this, you can use the tariff channel in calcs with the meter channel.

[Ampm]

Hi Thanks

I copied the code but i can't get it to work i get this error message

02/23/10 10:24:53.153

C1112 Tried to do a GetTime() on a value without any time associated: Line 2k

Any ideas

Thanks

Andy

[AzeoTech]

sorry, that was a typo on my part. The if() line should read:

if ((meter.time[0] % 86400 < 8*3600) || (meter.time[0] % 86400 > 18*3600))

temp is empty so doing an if() on it makes no sense!

[Ampm]

Thanks a lot i'll give it a go