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Installation Guidelines
Plugging input and Output Modules into the Bus Units
Before you plug in an input or output module, you
the module type.
Setting the Coding Element
An identification number is printed on the front plate of every 1'0 module. Depending on the
particular module type, the number is between two and eight. There is a white mechanical coding
key located on the back of each module. The
module type and cannot be changed. The bus unit has a mating component for each key, a white
rotating coding element or "lock" (see Figure 3-3).
Use a screwdriver to set the "lock" on the bus unit to the corresponding 1/0 module code number.
Figure 3-3. Coding System to Prevent an Inadvertent Interchange of Modules
The 6ES5 788-8MA11 simulator module does not have a coding key. You can plug in this simulator
module in place of any module.
Attaching 1/0 Modules
Hook the module onto the top of the bus unit.
2. Swing the module down onto the bus unit.
3. Press the module down firmly.
4. Tighten the hold-down screw on the front of the module to attach the module to the bus unit.
Removing l/O Modules
Remove the hold-down screw and swing the module up and out of the bus unit.
3-4
must set the bus unit's coding element to match
key is determined by the
position of the coding
EWA 4NEB 8126120-02
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