INFICON MPI-16 Crucible Indexer - Manual (Page 37)

MPI-16 & MPI-16H POCKET INDEXERS
Operation 4-3
1 0 1 1 12
1 1 0 0 13
1 1 0 1 14
1 1 1 0 15
1 1 1 1 16
Table 4-1 Pocket Select Inputs Truth Table
If you select a pocket out of the range set by the Number of Pocket switch, the Pocket
Indexer will continue to go to the last valid pocket that it sensed, but it will not consider
itself “In Position,” nor will the Interlock relay be turned on.
4.2.1.2 Directional Drive
The alternate method involves sending “Directional Drive” signals from the Deposition
Controller. In this mode, when “CW” input is asserted, the MPI-16 rotates clockwise
exactly one pocket, and when “CCW” input is asserted, the MPI-16 rotates counter-
clockwise exactly one pocket. The MPI-16 will pause briefly to allow the external
controller to sense the current position before another CW or CCW signal may be
accepted. This will be the mode of operation if the Rotation Mode switch is set to
Remote.
4.2.2 Pocket Position Feedback
Typically, the Deposition Controller’s program will want to know what pocket the Pocket
Indexer is currently on. To facilitate this, a 4-bit “Pocket Feedback” signal is sent back to
the controller. This signal is changed whenever the MPI-16 advances to a new pocket
position, even if it is not necessarily the target pocket. See Table 4-2 below for position
feedback truth table.
Pocket Position Feedback Outputs
Bit 3 Bit 2 Bit 1 Bit 0 Pocket Position
0 0 0 0 1
0 0 0 1 2
0 0 1 0 3
0 0 1 1 4
0 1 0 0 5
0 1 0 1 6
0 1 1 0 7
0 1 1 1 8
1 0 0 0 9
1 0 0 1 10
1 0 1 0 11
1 0 1 1 12
1 1 0 0 13
1 1 0 1 14
1 1 1 0 15
1 1 1 1 16