Static information storage and retrieval – Addressing
Patent
1981-06-26
1984-08-21
Moffitt, James W.
Static information storage and retrieval
Addressing
G11C 800
Patent
active
044674589
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS
This invention is in part disclosed in a co-pending application entitled Read Clock Pulse Controller, Ser. No. 279,979, filed June 26, 1981, in a co-pending application entitled Read-Only Sequence Controller, Ser. No. 279,981, filed June 26, 1981, and in a co-pending application entitled Read-Only Sequence Control System, Ser. No. 328,574, filed Dec. 3, 1981.
TECHNICAL FIELD
The present invention relates to a read-only sequence controller and more particularly to a sequence controller of a stored program system having an EPROM attached thereto.
BACKGROUND ART
A conventional sequence controller has a writing means and a reading means. However, the writing means is not used after a necessary data has been written in. Therefore the sequence controller having the writing means which is scarcely used is very unreasonable and expensive. In order to remove such disadvantages, it should be attempted to provide a sequence controller having a single function.
DISCLOSURE OF THE INVENTION
In accordance with the present invention, the sequence controller is divided into a write-only sequence controller and a read-only sequence controller. The write-only sequence controller is provided for writing data in an EPROM or MASK ROM to be attached thereto. The read-only sequence controller is adapted to mount the EPROM or ROM and to produce an output of the data in the EPROM or ROM.
Since data may be written in a plurality of EPROMs by one write-only sequence controller, an economical control system may be provided. Accordingly, only one write-only sequence controller can be used for writing data in EPROMs for a plurality of read-only sequence controllers, even 1000 units of read-only sequence controller.
Since the read-only sequence controller is not provided with a write-in device, it may be made into a compact device at a low cost. The controller may be easily operated. That is, data is obtained by merely depressing a start switch after selecting a cycle time. Since the read-only sequence controller of the present invention may be made into a light device of a compact size, automatization of machine and for energy saving may be expected.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a plan view of a read-only sequence controller according to the present invention;
FIG. 2 shows a perspective view of the sequence controller;
FIG. 3 shows a cross sectional view of the sequence controller;
FIG. 4 shows a circuit of a read clock pulse controller of the present invention;
FIG. 5 shows a plan view of an output relay unit of contact relay system connected to the sequence controller;
FIG. 6 shows a circuit of a contact relay system; and
FIG. 7 shows a circuit of a contactless relay system.
BEST MODE FOR EMBODYING THE INVENTION
Referring to FIG. 1, a case of the sequence controller comprises panel plates 1 and 2 and a pair of covers 3 made of metal plate. An EPROM 4 is detachably fixed to a connector 5. Preset code switches 6 and 7 display digits of two figures as the sequence cycle time. Numeral 8 is a cycle time selection switch, 9 is a start switch, 10 is a stop switch. A ribbon cable 11 is connected to an outside output relay unit through a connector 12. Numeral 13 is a pilot lamp. An abnormality detecting connector 14 is connected to an outer abnormality detecting circuit. An auto-start connector 15 is connected to an outside remote controller and auto-stop connector 16 is connected to the outside remote controller. A connector 17 is connected to an outside remote control manual start switch. A connector 18 is connected to an outside remote control stop switch. When a changeover switch 19 is turned OFF, one cycle of operation is done, while the switch 19 is turned ON, the cycle is repeated. Numeral 20 designates a reset switch, 21 is a supply code, 22 is a fuse, and 23 is a power switch.
As shown in FIGS. 2 and 3, a pair of supporting projections 26 for a printed-wiring boards 24 and 25 and projections 27 for covers 3 are formed in panels 1 and 2. Opposite end portions of
Moffitt James W.
Roberts John T.
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