Abstract: A control device is provided with a task execution unit, a collection unit which collects variables which have been referenced and updated in a user program and a management unit which manages the collected variables. The user program includes a collection instruction program which instructs the collection of the variables by the collection unit. The collection instruction program further includes distinguishing information for a user to distinguish the location of the collection instruction program in the user program. When the collection of the variables has been instructed by the collection instruction program, the management unit associates the variables collected by the collection unit with the distinguishing information of the collection instruction program.

Abstract: A control device includes a task execution unit; a storage unit which stores a variable in a program, which is capable of being referenced and updated; and a collection unit which collects a variable when a task is executed. The storage unit stores reference data corresponding to the variable. A plurality of tasks include: an update task which is capable of updating and referencing the variable; and a reference task which is capable of referencing the reference data. The collection unit collects the reference data when the plurality of tasks are executed.

Abstract: A sequence control portion of a control program is configured to execute simulation for one period to generate an execution result related to the sequence control portion. A motion control portion is configured to execute simulation for one period to generate an execution result related to the motion control portion. A control period number is then increment updated. Whether or not a resumable control period is determined, and if determined as the resumable control period, content of a resuming data buffer (828) updated in the previous control period is saved in a resuming data storage section (826).

Abstract: An active filter having a frequency characteristics of the fewer variations of manufacturing and the least temperature dependency is provided. A differential amplifier is comprised of resistors 15 and 16 which have a resistance value R.sub.E and are connected in common to a current source 39 in proportion to kT/(qR.sub.0), together with transistors 13 and 14. The transistor 14 is connected to an active load comprised of transistors 18 and 19. The transistor 18 is connected to a current source 31 for producing a current in proportion to a capacity C.sub.0 while the transistor 19 is connected to a current source 30 for producing a current of a remainder of the current produced by the current source 31 subtracted from the current in proportion to 1/R.sub.a. The transistor 19 is further connected to an internal capacitor 21 having capacity C.sub.1. A frequency characteristics of the active filter circuit is determined by the ratio of resistance values R.sub.E, R.sub.0 and R.sub.

Abstract: An input device of character data, wherein a number of character groups to be inputted are stored in a character generating means, which receives address assignment and output corresponding characters to the address in sequence as pattern signals. The character displayed on a display is inputted using a cursor.

Abstract: On the transmitting side, a writing is divided in blocks, read picture signals for one block are stored in a picture signal memory, the stored picture signals are interleaved in the order of the specific pattern, and then the interleaved signals are transmitted, and on the receiving side, the above-mentioned received picture signals for one block are stored in a picture signal memory, and the picture signals are deinterleaved in the order of read of the writing.

Abstract: A frequency discriminating circuit for readily discriminating between two signals having closely adjacent frequencies in which the effects of drift of circuit elements are eliminated. A frequency mixer receives the signals to be discriminated which have closely adjacent frequencies f.sub.1 and f.sub.2 and a reference signal with a frequency of f.sub.m. A first low-pass filter coupled to an output of the mixer produces an output signal containing only frequency difference components .vertline.f.sub.1 -f.sub.m .vertline. and .vertline.f.sub.2 -f.sub.m .vertline. between the signal to be discriminated and the reference signal. The output of the first low-pass filter is passed through a second low-pass filter. A phase comparator receives the output signals from the first and second low-pass filters and discriminates the input signals in accordance with a phase difference between the output signals from the first and second low-pass filters.