Reference Manual

16-Axis MACRO CPU Software Reference Manual

38 16-Axis MACRO Station MI-Variable Reference

The encoder sample clock signal SCLK controls how often the 16-Axis MACRO Station's digital

hardware looks at the encoder and flag inputs. The 16-Axis MACRO Station can take at most one count

per SCLK cycle, so the SCLK frequency is the absolute maximum encoder count frequency. SCLK also

controls the signal propagation through the digital delay filters for the encoders and flags; the lower the

SCLK frequency, the greater the noise pulse that can be filtered out. The SCLK frequency should

optimally be set to the lowest value that can accept encoder counts at the maximum possible rate.

The pulse-frequency-modulation clock PFM_CLK controls the PFM circuitry that is commonly used for

stepper drives. The maximum pulse frequency possible is 1/4 of the PFM_CLK frequency. The

PFM_CLK frequency should optimally be set to the lowest value that can generate pulses at the

maximum frequency required.

The DAC_CLK controls the serial data frequency into D/A converters. If these converters are on Delta

Tau-provided accessories, the DAC_CLK setting should be left at the default value.

The ADC_CLK controls the serial data frequency from A/D converters. If these converters are on Delta

Tau-provided accessories, the ADC_CLK setting should be left at the default value.

Example: See MI903 Example