Building block structure Manual BG41/BG42/BG43
2-4 Rev. 99/49
2.2.2 Building block BG42
The interface building block BG41 is a flat building block in double Euro-
format with two 48-pole base plugs in the construction system ES 902. It has a
width of 1 1/3 mounting places.
The building block BG42 has 2 interfaces, which could be adapted to certain
physical modes of transmission by means of interface modules.
The front panel of the module consists of:
(1) Two 25-pole SubD socket for the two interfaces with
(2) hexagonal threaded bolts for fastening the plugs
(3) Two or four LEDs above the 25-pole SubD sockets, which provide
information on the operational state and on each connected module
(see chapter 3).
(4) An 8-pole mini DIN socket for the service interface.
Fig. 2-4:Front panel of building block BG42
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