Managing a power supply module fitted with an bus X extension module
(Original Document)
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CAUTION
UNEXPECTED APPLICATION BEHAVIOR
If a bus X extension module (TSX REY 200) is used in an installation, then do connect, power and set to function all the racks configured in the application before managing the software application.
Failure to follow these instructions can result in injury or equipment damage.
NOTE: All use of an bux X extension module (TSX  REY 200) in an installation makes management of the installation or the machine subject to all the racks configured in the application being present.
In order to do this, an application check must be carried out to make sure that all the application racks are present by testing the bit %MWxy MOD 2 X6 (explicit exchanges) on at least one module on each rack. This test allows the racks to be cleared of all incorrect declarations in the rack addressing and, in particular, if two racks bear the same address by mistake.
This test only comes into play after the installation has completely restarted (switched on, installation modified, processor RESET, configuration changed).