How do you shut off the heated bed in Repetier?

I am using a very large silicone bed heater with a standalone PID controller. Would I just set the value in the bed temperature to "0" in the printer config? The controller lets me set the temp from the front of the machine... I am still looking at various units at various prices. The costlier ones seem to communicate, the more basic ones do not. My heater is coming with a thermocouple. Optionally, it is likely that I can talk to the RAMPS with the PID, but not the other way around. So I can let the Ramps know when I come up to temp, but not have a heater plugged in. Is this possible? This would likely be the optimum solution.Thanks.

Think I found it... Set %ob to 0 in firmware??? (heated bed temp output) That way I could let it think it is heating the bed, when it's being heated externally?

OK, now this issue has got me to go digging around in the firmware, and a number of issues and answers are coming to light. I'll talk about extruders in the build thread, but as for this item, my conclusion is that I will run the heatbed on a standalone pid controller, looped with a thermocouple, and then add a thermistor to talk back to ramps. The output to the heater will be set low and will operate a status indicator. That way the ramps is happy, and the heat bed is far more reliable, and accurate. This will make a difference in calculations, more than in real time operation, but the overall advantage far outweighs the cost.