electrojef

Sorry, I may not be asking the question correctly. I'm fairly new to plc's.It is a momentum,and I know how to use the traffic cop to install the AAI 520 40 card.I found in the manual how to hook up the type J thermocouple to the device.This is the first one I've had to program.I guess I should have asked the question this way. I have seen in other programs where there using sub blocks in the logic to control tempertures. I'm wanting to turn on a fan when the temp is 70 degrees and turn off when it is below 70 degrees. Is there any way you could provide me with any examples of programming this in the ladder logic.Sorry for being so confusing,and I hope this make sense. Thanks for your help

I'm using proworx 32 and a AAI 520 card. I'm triing to figure out the best way to program. Using sub blocks I'Ve seen sub blocks used using 4xxxx registers,but i'm really not sure the best way to program.would you have any suggestions. Thanks

I need to turn on/off a fan using a thermocouple when water temp is 70F.This is the first thermocouple I've had to program. Can anyone provide me any info/examples on how to program this. Do I use a sub block. I think that what I'll use,not for sure.I hope i provided enough info.Thanks