Hi,
Normally, you want to take an action when temperature reaching above certain degree or below certain degree., I assume you set temp sensor to F, not C, so that if T2 is 370, you actually mean when temperature goes below 37F?
What device do you have connected to OP1 and OP8? When we write code, we also consider what kind of load.
Another factor we want to know is at what temperature you want to turn off OP1 and OP8? You can turn on heater, at the same time, you will need to implement logic for when to turn off the heater, or everything will be overheated.
You mentioned you have not been able to send email out yet. Did you try to setup a Yahoo email account to send email by pressing the test button in the gui?
You also need to plan which digital input and analog input being used for your sensors. Then you wire them up, After that, you should be able to see those sensor status changing each time any sensor is triggered. You may have to go to "general" tab to check the "polling" checkbox and save, that will enable constantly pulling IO status and showing them on the screen. Once you finished your code and debug, you can uncheck that checkbox, so that leave all the CPU to run the PLC logic.
Take a step at a time, you will be able to get there. We will work with you, so that you can master it in this process.