mikec wrote: I wish to set a target temp and have the alarm activate when it reaches it. Can anyone help in laymans terms?
I have a C100 and there are a few different alarm modes, the default for mine is "Deviation high alarm" which means the number set by AL1 is for the number of ºC above the SV value that PV must reach before the alarm will activate ie Alarm will activate when PV=SV+AL1 eg if you set AL1 to 0 the alarm will activate at the temperature set by SV.
You can change the alarm mode in the Initial Setup menu (Cod=0000) by navigating to SL4. If you wish to be able to set a temperature above which the alarm will activate in AL1 you need to set the alarm mode in SL4 to be "Process high alarm" which on my C100 is SL4 = 0011
You may also wish to alter the AH1 value in the Initial Setup menu. This is the Alarm hysteresis ie the difference in temperature that the alarm activates and deactivates.
AL1 = 0050
AH1 = 0002
when PV reaches 50ºC the alarm will activate and stay activated until PV drops to 48ºC (ie AL1-AH1)
Hope that helped