How to disable drive upon LabView error

I'm running a closed loop PD position controller in Labview 8.5 and NI PCI-6259 M series card and BNC-2120. I'm sending an analog voltage signal (+/- 10) to a Copley Xenus amplifier (current command) as well as a +5v signal to enable the amplifier. The controller uses position for feedback. When labview errors out, the daq card stays in its current state (and keeps sending the 5v enable signal). For safety reasons, how can I configure my system so that this signal stops being sent out, and the amp is disabled?
Maciek

The program crashed. I shut off the amp. The actuator shaft, which is positioned vertically, dropped to its lowest position due to gravity (it's a linear actuator). The daq card kept pumping out a high force command, due to the large position error created by the disturbance, as well as the 5v enable signal. Upon turning the amp back on, the PD controller saw a large difference between desired and actual position, and the actuator shaft shot up forcefully, creating a very dangerous situation. In the program, I have a case structure which won't enable the amp. unless the difference between desired and actual position is small enough. But the amp stays enabled when labview crashes.
m

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