Robot drops out of run mode

Check the energy conservation feature in $Parameter Grp, $Srvo off enable. If true the servos are going to time out according to the settings for each servo motor and turn off the power to the motors and allow the brakes to hold the position instead of the servo amp.

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Quote from Petewalz

I have a robot that drops out of run mode when it is idle for a length of time.
When our line stops for lunch when we start back up we find that the robot is no longer in the run mode (green light is off)
There are no faults on the teach pendant and the fault light is not on.
All we have to do is press the cycle start button and the robot will run until it is idle for an extended period of time.
Is there a parameter or variable that cycle stops the robot after a certain time?

Without more details on your line, I would assume problems with your PLC sending a PNS/whatever or resume logic when it finally gets a PNS. Unless your program does a true continous loop, then that's a different matter.