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Controller 450 User’s Guide
Appendix D Item Designations
D-8 3BSE 002 415R701 Rev A
Connection Units
The item designation code for the contacts of the connection unit are shown in Figure D-12.
The connector for internal connections in the cabinet is always designated X80.
The terminal block group or connector for external connections is designated X90.
If there are more connectors, these are designated X81, X82, or X91, X92, and so on.
When more than one connection unit is mounted on the same mounting bar, the units are
numbered as follows:
The mounting bar for connection units is divided in width modules à 20mm, which is a multiple
of the standard connection unit width.
19 inch 24-width modules
24 inch 30-width modules
The item designation specified for a connection unit is that module number covered by the
upper left-hand corner of the unit installed.
Figure D-14 shows a typical connection between connection unit B1.1 and I/O board U4.125.
The item designation of the board gives its location in the subrack.
Figure D-12. Connection Units, Connection and Terminal Numbering
Figure D-13. Location of Connection Units on a Mounting Bar
X80 X80
X90
1 - - - - - - - - - - - - - - - - - 46
X90
1 - - - -5
X91
X92
19” design
1
13 24
B4
B4.1
B4.13
Level
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