S5-115F Manual Installation Guidelines
Mechanical slot coding
On the back of each module, with the exception of the power supply and central processing unit,
is a slot coding element in the form of a two-part plastic cube. This coding element ensures that,
when a module is replaced, only another module of the same type will be plugged in in its place.
The coding element consists of two parts, one like a lock and one like a key. The two parts fit
together in a defined position. This position is specific to each type of module. When you install
the module, the coding element is inserted into the mounting rack. When you swing the module
out, the key-shaped part of the element stays in the mounting rack and the lock-shaped part stays
on the module.
Now you can install only this particular module or an identical one in this slot.
If you want to install a different module, you have to remove the coding element from the
mounting rack.
You can also work without slot coding. To do this, you must pull the coding element off the
module before you swing the module into place for the first time.
Figure 3-13. Slot Coding Element
EWA 4NEB 811 6148-02
3-13
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