XYCOM XVME-491/1 Analog output module

The analogue bus is separated from the G-64 bus, but uses the same Eurocard module format and DIN 41612-C connector. This analogue bus can hold an analogue current regulation board or the digital equivalent based on a DSP. If the power converter is small enough to fit in the lower 3U part of the chassis, then the analogue bus can also have a module dedicated to the control of firing. The G-64 chassis can hold modules to drive a CERN-designed power converter as well as completely different modules for commercial power converters. This flexibility is the fourth strength of the G-64 design. CERN has defined about ten different broad controls functionalities, implemented on more than 65 different Eurocard designs. About 70% of the designs correspond to replacements for the same functionality due to obsolescence of certain components. This division into modules has prevented the overall collapse of the G-64 crates when confronted with the obsolescence of individual components, which can happen with single multi-purpose boards.

The main functionalities defined for the CERN G-64 crates are: 

Communication with the centralized system that remotely operates all the power converters (two modules): o The first one using CAMAC (still in use in 2005!) o A later one using MIL-1553 ‚ G-64 Master CPU that drives the G-64 bus (four modules): o The first three are evolutions of the same MC6809 CPU o The fourth is a replacement using a new Mitsubishi microcontroller ‚ Display and Keyboard: three modules, one being an evolution of another ‚ ADC measurement interface: four modules with different characteristics, plus evolutions of each brand due to performance needs or obsolescence

DAC reference interface:

 three modules with different characteristics, plus evolutions of each brand due to performance needs or obsolescence ‚ Digital I/O: five modules with different characteristics and evolutions, non-isolated, opto-isolated, with relays, etc… ‚ Analogue closed loop regulation: several modules with different characteristics and evolutions, P loop, PI loop, PID loop, switching PWM, limiters, etc… ‚ Digital closed loop regulation: one DSP module with four evolutions, one digital thyristor gate control module for 6/12/24 phases with 4 evolutions This diversity of modules enabled variants of the same design to be rapidly adapted to a very diverse population of power converters used in different ways. This was particularly important as more and more commercial power converters were chosen and each type came with a different interface, often lacking certain functionality such as remote control of converter state, polarity inversion or precise timing. In the end, more than 20 variants of G-64 chassis were developed and remain in operation.

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