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How to Plug Input and Output (1/0) Modules into the Bus Units
Before you mount an input or output module, you must
match the module type.
changing modules.
Use the following information to set the coding element.
A code number is printed on the frontplate of every
eight, depending on the particular module
the back of each module.
cannot be changed. The bus unit has a mating component for each key, a white rotating
element or "lock" (see Figure 5-3).
to set the "lock" on the bus unit to the corresponding
number.
Figure 5-3. Coding System to Prevent an Inadvertent Interchange of Modules
To attach the module, proceed as follows:
Hook the module onto the top of the bus unit.
Press the module down firmly.
To detach 1/0 modules:
EWA 4NEB 8126210-02
The coding element keeps you from confusing module types when ex-
type. There is a white, mechanical coding key located on
The position of the coding key is determined by the module type and
Expansion of Basic System with External //0s
set the coding element on the bus unit to
number is between two and
module. The
coding
module
5-3
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