02.2001 3 Hardware
© Siemens AG 2001 All Rights Reserved
SINUMERIK 840Di System Overview (SYI) - 02.2001 Edition 3
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3.3 MCI Board Extension
The MCI-Board Extension is an optional ex-
pansion board for the MCI Board, which has
the dimensions of a short PCI plug-in board.
The following components can be connected
via a SINUMERIK cable distributor:
• 2 handwheels (either differential or TTL
handwheels)
• 2 sensing probes
• 4 fast digital inputs/outputs each
The electrical connection to the MCI Board is
provided via a 26-pin ribbon cable.
The MCI-Board Extension is available in 2 in-
stallation variants:
• MCI-Board Extension internal
• MCI-Board Extension backpack
For mechanical fastening, the MCI-Board Extension internal variant is plugged into
the second PCI slot.
If the second slot is needed for supplementary or option boards (OEM or end user),
the MCI-Board Extension backpack variant can be used. This module is mechani-
cally fastened using a modified housing cover virtually "outside" the PCU 50.
Fig. 3-4 PCU 50 with MCI-Board Extension, external variant
Fig. 3-3 MCI Board Extension
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