Self-test circuit apparatus

Details Self-test circuit apparatus Self-test circuit apparatus

1978-01-23

1980-02-19

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

235 92MS, 235 92EV, 235 92CA, G06M 312

Patent

active

041896351

ABSTRACT:
The present invention relates to the method of and apparatus for performing test operations on a primary counter to make sure that it is continually providing correct operational capability. The tests comprise periodically interrupting the operation of the primary counter, forcing it to count to both the maximum and minimum limits and checking to make sure that the limit has been obtained, inserting an intermediate number and checking to be sure that this number can be transferred therethrough and then resetting the primary counter to the count of a backup counter which has been keeping count during the test process. Finally, a comparison is continually provided during normal operation between the backup and the primary counter to make sure that they are tracking with the same counts. Failure of any of the comparisons or tests to be completed in accordance with specified results causes an error signal to be generated as an alarm.

REFERENCES:
patent: 3746843 (1973-07-01), Wesner
patent: 3932738 (1976-01-01), Hauber et al.
patent: 4001553 (1977-09-01), Troutman

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