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What condition could bring about stop code 0400 on a Unity Quantum CPU

 Stop code 0400 can occur if you download a Unity file with "Change Configuration on the Fly" or CCOTF  selected but the
 CRP9 in the PLC back plane is using firmware <2.0 . The CCOTF option was offered with CRP9 firmware version =>2.0 .
 If you experience the 0400 stop state check the PLC configuration for a selection of CCOTF and disable this functionality.
 You could also re-flash the CRP9 with a firmware version that supports CCOTF.

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