Abstract: A programmable logic controller (10) is connected to external equipment (40) through a serial communication unit (30), and the programmable logic controller (10) includes: a memory (7), including a user program (11) and a setting document (13), where the user program (11) records both of a command for the communication interface device and command target information thereof, and the setting document (13) saves address information corresponding to the command target information; and a processor (8), reading the user program (11) and the setting document (13) to execute the command.

Abstract: Provided is a technique enables programming, including that for database operations, without describing a SQL used to operate the database. A PLC (30) that can access a DBMS (22) stores a user program (38) and definition information (32), the user program (38) including a structure type of variable, the definition information (32) indicating a definition of the structure type. The sequence command program (34) sequentially executes instructions in the user program (38) and invokes a DB access process program (35) in order to access the DBMS (22). The DB access process program (35) reads the definition information (32) and, on the basis of the read definition information (32), generates a SQL statement to be used when access to the DBMS (22) is made by execution of the user program (38). The DB access process program (35) executes the generated SQL statement by transmitting the SQL statement to the DB server (20).

Abstract: A technique capable of efficiently performing debugging in a program and checking of soundness in a control system including a controller and a database system. A CPU unit has a communication interface for connection to a database device. The CPU unit executes a user program to call a DB connection service in accordance with an instruction included in the user program and generate a statement to access the database device. In the DB connection service, a statement according to an access instruction is generated, and the generated statement is transmitted to a database system. After that, information indicative of time until a response from the database system is received is acquired, and the acquired information is stored as a log into a memory. A support device acquires the information and displays it on a monitor.

Abstract: A technique for facilitating debugging in a user program which operates by cooperation of a PLC and another system in a control system including a controller and another system. A CPU unit has a communication interface, executes a user program, calls DB connection service in accordance with an instruction included in the user program, and generates a statement to access a database device. In the DB connection service, operation is performed while switching a first mode and a second mode. In the first mode, a statement according to an access instruction is generated, the generated statement is transmitted to a database system, and a result of a response is sent to the user program. In the second mode, without transmitting the statement to the database device, a result of execution corresponding to the statement is sent to the user program.

Abstract: The present invention provides a technique for improving the reliability of access to a database system in a controller, such as a PLC. A PLC accessible to a database accesses a DB server in response to an event in which a user program calls a DB access processing program. The DB access processing program stores status information indicating a status of accesses to the DB server in a nonvolatile memory, in accordance with an instruction of the user program. When a power interruption occurs, the PLC can obtain a status of accesses to the DB server at the timing of the occurrence of the power interruption by referring to the status information. Then, the PLC, for example, re-sends a SQL sentence, depending on the access status.

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: It is the present state that dichloroisocyanurates are used for only specific limited applications because they have poor storage stability, high metal corrosiveness and a very irritating odor in case where the concentration thereof in an aqueous solution is increased, and so on. An object of the present invention is to provide a dichloroisocyanurate composition having high storage stability, having low corrosiveness for various metals in case where it is used in a state of aqueous solution, and generating no irritating odor even when the concentration thereof in an aqueous solution is increased. The present invention provides a composition comprising as essential ingredients a dichloroisocyanurate and sodium metasilicate pentahydrate in which only particle surface is subjected to a treatment for reducing the degree of hydration.

Abstract: A method for bleaching a cloth dyed with an indigo dye by using a processing solution containing a bleaching agent, wherein said processing solution is an aqueous solution of a dichloroisocyanuric acid salt, is disclosed. According to the invention, the degree of bleaching can be easily controlled and, after the bleaching, neither yellowing nor deterioration of fibers occurs.

Abstract: Chloroisocyanurate compositions for disinfection and sterilization comprise a dichloroisocynurate and at least one alkaline substance selected from the group consisting of magnesium oxide, magnesium hydroxide, calcium hydroxide and sodium carbonate. The chloroisocyanurate compositions can prevent an increase in hydrogen ion concentration often caused by continuous use of dichloroisocyanurates in closed water systems and have excellent stability in a wet state and stability during storage over long periods of time.

Abstract: The present invention relates to a chloroisocyanuric acid composition having stability during storage characterized by formulating, as a main component, 1 to 200 parts by weight of at least one aluminum sulfate selected from aluminum sulfate (Al.sub.2 (SO.sub.4).sub.3.XH.sub.2 O, X=0 to 18), potassium alum (KAl(SO.sub.4).sub.2.XH.sub.2 O, X=0 to 12) and sodium alum (NaAl(SO.sub.4).sub.2.XH.sub.2 O, X=0 to 12) in 100 parts by weight of trichloroisocyanuric acid and/or dichloroisocyanuric acid.

Abstract: Styrene based resin compositions comprise a styrene resin and a graft copolymer obtained by graft-polymerizing, in the presence of a butadiene based rubbery polymer, a monomer mixture composed of a monomer containing 1-50 ethylene oxide groups and one ethylenically-unsaturated bond and styrene or a monomer mixture compound of styrene as a principal component and at least one monomer copolymerizable with styrene. The a styrene based resin compositions are obtained by blending the graft copolymer with a styrene resin and having excellent impact strength and visual properties.

Abstract: Solid chlorinating agents can be stored highly stably and safely in a closed system for a long period of time without discoloring or deterioration, when a storage stabilizer of alumino-silica gel obtained from allophane incorporated with active carbon is placed in the ambient atmosphere enclosing the chlorinating agents, preferably not in direct contact with the agents. In addition, the agents do not cause damages on the surface and material of, or breakdown of, the container constituting the closed system, and no offensive odor is generated upon opening even after a prolonged storage.

Abstract: Fungi growing on a hide are removed by immersing the hide in an aqueous solution of chlorinated isocyanuric acid or salt in a solution of chlorinated isocyanuric acid or salt in a halogenide of an aliphatic hydrocarbon having one to three carbon atoms or in a ketone or ester represented by the general formula: ##STR1## (wherein, R.sub.1 denotes an alkyl group having one to three carbon atoms and R.sub.2 an alkyl group or alkoxy group having one to three carbon atoms).

Abstract: A method of storing a solid chlorinating agent with improved storage performance involving placing the solid chlorinating agent and a storage stabilizer such as calcium oxide, trisodium phosphate, magnesium oxide, ferrous oxide, melamine, ammeline or ammelide in a closed container in a manner that the stabilizer contacts the noxious gases in the same container but not with the solid chlorinating agent in the same container. An article for storing the same is composed of a closed container in which the solid chlorinating agent is placed together with the storage stabilizer in such a manner that the gases are brought into contact with the storage stabilizer.

Abstract: Method and apparatus wherein a set of three non-contact gap detectors are arranged at predetermined regular intervals parallel to and in the direction of measurement of the surface flatness of a material, and the gap between the material and each detector is measured and computed continuously to continuously measure and indicate the surface flatness of the material without being affected by an overall curve of the material and also to measure the period of the occurrences of the defect in the flatness of the material.