Assembly
4.2 Installing/uninstalling the EM495-8 twisted pair extender for SCALANCE X414-3E
SCALANCE X-400 extender modules
20 Compact Operating Instructions, 04/2013, A5E00367421-10
4. Remove the two covers from the extender.
5. Place the extender module on the edge of the S7-300 standard rail with the upper groove
angled slightly towards the back and tilt the extender towards the back. Make sure that
there is adequate clearance between the guide bolts of the extender module and the
basic device. In this position, the extender module should not be able to slip off, however
it can be moved horizontally in both directions.
6. Push the extender module slowly to the left while keeping it straight and without skewing
and check that the two guide bolts on the extender fit into the holes in the basic device.
Then push the extender module to the left as far as it will go so that it is flush with the
right side of the basic device.
7. Using a slotted screwdriver with a 5.5 mm wide blade, tighten the captive screw between
slots 12 and 13 in the lower part of the extender module.
8. Using a slotted screwdriver with a 2.8 mm wide blade, tighten the two captive slug screws
on slot 11. The screws lock the two guide bolts, so do not use excessive force when
tightening them.
9. Fit the CV490 4x100 cover to slot 11 of the basic device and slots 12 and 13 of the
twisted pair extender.
Figure 4-1 Installing the twisted pair extender on the S7-300 standard rail
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