| 摘要 |
A system is disclosed for providing sequential control signals to an apparatus including a plurality of M banks of elements, wherein each bank comprises up to N elements and wherein the banks are moved in either a forward or reverse direction by incremental steps and wherein the groups within the banks are each moved incrementally in a cyclical manner. Such an apparatus could be the well known jack mechanism for moving the respective positions of a plurality of control rods operative with a reactor device. A reversible control signal counter is provided which counts the cumulative number of steps taken by all of the M banks. Adjustable decoding means provide selected signals at predetermined counter states. The selected signals are indicative of the incremental steps taken by the first and final group of elements during bank sequencing. Means are provided responsive to the selected signals to provide sequential bank signals. The disclosure includes means for insuring that the last element moved prior to a change in sequencing direction is the first to be moved in the opposite direction when a change of direction is desired. Means are also provided to insure that misalignment of the elements within the bank cannot occur.
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