Mounting and Wiring
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14.1.10 Prevention of false mounting
A mechanical coding element prevents an electronics module from being mounted onto the wrong
base module – for example, following a defect in an electronics module. The coding element con-
sists of two pieces and is supplied with every electronics module.
The complete coding element is mounted on the underside of each electronics module. When
mounting the electronics module for the first time, the lower part of the coding element is automat-
ically inserted into the recess provided in the base module.
Should the electronics module be pulled, one half of the coding element remains in the base mod-
ule, the other half remains in the electronics module. It is now possible to mount a new electronics
module only when its coding matches that of the base module.
When replacing an electronics module (plugging a new electronics module), remove and dispose
of the lower part of the coding element (that part destined for the base module). The original lower
part of the coding element, which remains in the base module, cannot be removed.
Fig. 314: Coding of electronics and base module
NOTE
When plugging electronics modules for the first time, an initial resistance must be over-
come. This is because the lower part of the coding element has to be pressed into the base
module.
NOTE
When all modules are mounted, the supply to the module bus should be applied to check
if the station communication functions correctly (no false mounting, no empty slots, etc).
The field voltage should be applied only when the correct functioning of the station has
been established.
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