Installation guide
Commissioning
94
890USE17100 September 2003
Suppose that the module in location 4 is mandatory and the optional module in
location 2 is removed from its base, as shown below.
Again, the island will behave the same way as it would if all the modules were
optional—all of the existing modules would continue to be operational. However, if
you push the RST button while the module is removed the current configuration will
be erased and only the module in location 1 will be operational. If you power cycle,
instead of pushing the reset button, the island will not recognize the modules to the
right of the missing module in location 2. Since one of the modules that is not
recognized is the mandatory module in location 4, the entire island will go into pre-
operational mode and will not function.
12 4
5
6
MOOO O O
3
X
RST
12 4
5
6
MOOO O O
3
X
X
X
XXX