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Appendix A DIN Rail Expansion Modules
A.1 Mount the DIN rail
1. Make sure that the wall is dry, flat, structurally suitable, and not electrically
conductive.
2. Align the DIN rail so that it is level.
3. Bolt the rail to the wall.
4. Connect a protective earth ground from the DIN rail.
A.2 Attach an expansion module
CAUTION
If AC power is to be connected to the relay module(s), the relay module(s) must not
be connected to, nor installed in the same enclosure as modules connected to low
voltage devices (e.g. input modules, output modules or other relay modules with
low voltage connection).
1. Make sure that the DIN rail is mounted correctly.
2. Hook the module onto the DIN rail from above.
3. Swivel the module downwards and press it into the DIN rail until it audibly engages
(Figure 73).
4. For multiple modules, install the modules side-by-side on the DIN rail and slide the
modules together (Figure 74). This way the network and power supplies in the
modules are connected together.
Figure 73 Attaching an expansion module