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These are CPU boards used in Centroid CNC controls from 1993 to present. Not all versions of all boards are pictured.

Centroid CPU7 Board


Full-length (13") ISA board with 2105 DSP, four encoder inputs, five fiber optic sockets. Can operate only DC servo and OPTIC1 control systems.

Used in M10/M40 family controls and board-level controls, ca. 1993-1997

Distinctive features include stacked memory chips on front side of board, and dual-port RAM chip located on back side of board.

Centroid CPU7P3 Board


PC104-bus ISA board with 2101 DSP, five encoder inputs, five fiber optic sockets. Can operate only DC servo and OPTIC1 control systems.

Silk-screening on board labels it "CPUP3".

Used in M15 and M400 controls, 1996-2001

Centroid CPU7P5 Board


Full-length (13") ISA board with 2101 DSP, five encoder inputs, five fiber optic sockets. Can operate only DC servo and OPTIC1 control systems.

Used in M39 and board-level controls, ca. 1997-2000

Newer technologies allowed all components to fit on the front of the board. The stacked RAM chips were replaced with a single higher-capacity chip.

Centroid CPU7P5S Board


Short (10.5") ISA board with 2101 DSP, five encoder inputs, five fiber optic sockets. Can operate only DC servo and OPTIC1 control systems.

Used in M39 and board-level controls, ca. 2000-2003

The original version of this board, REV20000412 pictured above, has the encoder inputs lined up along the long edge. The later version, REV020924 pictured below, has the encoder inputs stacked along the short edge.


Centroid CPU9 Board

Short (10.5") ISA board with 2101 DSP, seven fiber optic sockets, no on-board encoder inputs. Can operate only AC servo control systems.

The standard CPU9 board works only with the SERVO4 drive unit. A minor hardware change yields a CPU9SD board, for use with the SD3 and SD1 drives.

Used in M39 and M400 AC-servo controls, ca 2003 - 2004.

Centroid CPU10A Board

This board is identified simply "CPU10", but is now called CPU10A to distinguish it from the CPU10B board released in 2006.


Short (10") PCI board with 2101 DSP, six encoder inputs, socketed PIC, seven fiber optic sockets. Can operate both DC servo, AC servo and OPTIC1 control systems.

Used in all controls ca. 2004 - 2006.

The encoder inputs can be damaged by a shorted encoder, and so should be protected by a piggyback snubber board (not pictured).

Centroid CPU10B Board


Short (10") PCI board with 2101 DSP, six encoder inputs, surface-mount PIC, seven fiber optic sockets. Can operate DC servo, AC servo and OPTIC1 control systems.

Used in all control models, ca. 2006 - present, but being phased out of new controls since 2010 in favor of the MPU11 family.

The encoder inputs have built-in snubber protection, and therefore do not require the piggyback board like the CPU10A.

Centroid MPU11 Board


12" x 5" Panel-mount board with Altera Cyclone processor, six encoder inputs, four fiber optic sockets. Works with GPIO4D combined PLC and third-party drive interface; with DC3IOB combined PLC and DC servo drive; and with OPTIC4 third-party drive interface.

The functions of the MPU11 board are also built into the All-in-one DC control unit, combining the controller with PLC I/O and a 3-axis DC servo drive.

Instead of plugging into an expansion slot inside the control PC, the MPU11 mounts on the control panel and communicates with the PC over a dedicated ethernet link.

Used in all control models, ca. 2010 - present

The encoder inputs have built-in snubber protection, and therefore do not require the piggyback board like the CPU10A.

The MPU11 uses, and requires, its own generation of PC-side control software, called CNC11.


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Copyright © 2014 Marc Leonard
Last updated 29-May-2014 MBL