Programmable controller

Patent metadata

Field	Value
Publication number	US-2016147682-A1
Application number	US-201314899584-A
Country	US
Kind code	A1
Filing date	Jun 25, 2013
Priority date	Jun 25, 2013
Publication date	May 26, 2016
Grant date	—

Abstract

A programmable controller according to an embodiment includes: a bus for data transmission and reception; a synchronous-control signal line that transmits a synchronous control signal; a synchronous-control-signal generating unit that is connected to the synchronous-control signal line and generates the synchronous control signal on a basis of an external signal; a data holding unit that is connected to the bus and the synchronous-control signal line and latches a signal from an external device in an internal memory in synchronization with the synchronous control signal; and a CPU unit that is connected to the bus and the synchronous-control signal line and reads a value in the internal memory via the bus in synchronization with the synchronous control signal.

First claim

1 . A programmable controller comprising:
a bus for data transmission and reception; a synchronous-control signal line that transmits a synchronous control signal; a synchronous-control-signal generating unit that is connected to the synchronous-control signal line and generates the synchronous control signal whose period changes such that a frequency is proportional to a speed of movement of a moving workpiece, on a basis of a variable pulse signal from an encoder measuring a position of the workpiece; a counter unit that is connected to the bus and the synchronous-control signal line and latches, in a first internal memory, a count value obtained by counting a pulse, number of which is proportional to an amount of movement of the workpiece, on a basis of the pulse signal from the encoder at a timing synchronized with the synchronous control signal; an analog input unit that is connected to the bus and the synchronous-control signal line and latches, in a second internal memory, an analog signal that is a measurement result of a sensor measuring a thickness of the moving workpiece at a timing synchronized with the synchronous control signal; and a CPU unit that is connected to the bus and the synchronous-control signal line and reads a value in the first and second internal memories via the bus in synchronization with the synchronous control signal.

2 . (canceled)

3 . The programmable controller according to claim 1 , wherein a signal with a constant period generated by the CPU unit is used as the synchronous control signal.

4 . The programmable controller according to claim 1 , wherein the counter unit and the analog input unit perform latching at a timing of a falling edge of the synchronous control signal and holds a same value for one period of the synchronous control signal.

Assignees

• Mitsubishi Electric Corp

Inventors

• Ikuyama Tomo
• Yamamoto Junji

Classifications

• G06F13/4278

  using an embedded synchronisation · CPC title

• G06F13/362 Primary

  with centralised access control · CPC title

• G05B19/042

  using digital processors (G05B19/05 takes precedence) · CPC title

• G05B19/05

  Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts · CPC title