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UMAC-CPCI Turbo CPU Board Hardware Reference Manual
 
Acc-24C2 PWM Axis Board 
The Acc-24C2 PWM axis board provides the interface circuitry for four axes of purely digital control in a 
single slot, with direct PWM outputs, serial ADC inputs, quadrature encoder inputs, and input/output 
flags.  Because of pin limitations on the J2 field wiring connector, signals that are differential on other 
Acc-24x2 boards are single-ended here.  To take these signals any significant distance, differential line 
drivers and receivers are required on a distribution board. 
Acc-24C2A Analog Axis Board 
The Acc-24C2A analog axis board provides the 
interface circuitry for four axes of control in a single 
slot, with analog interface to the servo drives.  It also 
has one pulse-and-direction output per axis for stepper 
drives, or stepper-replacement servo drives.  One 18-bit 
D/A converter comes standard for each axis; Option 1 
provides a second D/A converter per axis, which can be 
used as part of a sine-wave control scheme, or for non-
servo use.  Option 2 provides eight 12-bit A/D 
converters. 
Acc-51C Analog Encoder Interpolator Board 
The Acc-51C provides the circuitry for the high-resolution interpolation of two or four analog sine/cosine 
encoders, yielding 4096 states per line of the encoder.  The board comes standard with two channels of 
interface; Option 1 provides two additional channels. 
 
 
 
 
 
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Accessories