Transition monitor for a unit transition counter

Details Transition monitor for a unit transition counter Transition monitor for a unit transition counter

1975-01-09

1976-01-13

Dildine, Jr., R. Stephen

Registers

Transfer mechanism

Traveling pawl

3401462, 235 92EC, G05B 2302, G05B 103, H03K 1332

Patent

active

039327388

ABSTRACT:
Input data from an XY encoder stage is continuously monitored and compared to an internally generated count as the stage is adjusted in position. The internal count is generated a single count at a time by transitions in the X-Y input data on the basis that each transition is a one-step change in encoder position. A series of one-step transitions causes both the input data and the internal count to change together, or track. If a single transition is greater than a single encoder step, the input data advances ahead of the internal count and tracking is lost, causing a comparison error. The error halts the monitoring process, activates an alarm, and holds the current input data and internal count for visual comparison in a numerical display. The operator can then remonitor the faulty portion of the stage encoder to determine the nature of the error. The transition monitor is provided with internal testing circuit for counting up and down, changing counting directions, and detecting a prewired multistep test error.

REFERENCES:
patent: 3733472 (1973-05-01), Taisne

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