Abstract: A safety control system is provided, which is capable of monitoring many more drive circuits by using a single controller without modifying the configurations of the controller and the drive circuit. An a-contact of a relay is electrically connected between a FB (feedback) output terminal and a FB input terminal of a safety controller. A b-contact of the relay is electrically connected between a signal output terminal (safety output (1) terminal) of the safety controller and a signal input terminal (safety input (1) terminal) of a safety drive circuit. A coil of the relay is connected to a FB monitor output terminal of the safety drive circuit. No factor in a large voltage drop is present between the FB output terminal and the FB input terminal, thus making it possible to monitor many more drive circuits by using a single controller.

Abstract: Disclosed is a monitoring device for a rotary encoder electronically connectable to the monitoring device. A pulse generating unit generates a comparison pulse signal by extracting a portion corresponding to a specific phase range from a first pulse included in a first pulse signal output from the rotary encoder. The rotary encoder detects rotation of a rotating body and outputs the first pulse signal and a second pulse signal, the first pulse signal and the second pulse signal having a phase difference from each other. A determining unit determines an abnormality of the rotary encoder, based on a state of a pulse of the comparison pulse signal at a specific timing of a second pulse included in the second pulse signal.

Abstract: Disclosed is a proximity switch provided with an actuator unit and a sensor unit. The sensor unit is provided with an antenna coil, a transmitting circuit which transmits electromagnetic waves at a constant frequency to the antenna coil, a receiving circuit which detects external signals received by means of the antenna coil, and control circuits. The actuator unit is provided with an antenna coil, a power supply circuit which rectifies an electromotive force generated in the antenna coil, and a signal processing circuit which receives power supply from the power supply circuit, performs frequency-dividing to the signals received by means of the antenna coil, and transmits the signals from the antenna coil after the frequency-dividing. The control circuit of the sensor unit has memory for registering the frequency of the signals transmitted from the actuator unit.

Abstract: Disclosed is a monitoring device for a rotary encoder electronically connectable to the monitoring device. A pulse generating unit generates a comparison pulse signal by extracting a portion corresponding to a specific phase range from a first pulse included in a first pulse signal output from the rotary encoder. The rotary encoder detects rotation of a rotating body and outputs the first pulse signal and a second pulse signal, the first pulse signal and the second pulse signal having a phase difference from each other. A determining unit determines an abnormality of the rotary encoder, based on a state of a pulse of the comparison pulse signal at a specific timing of a second pulse included in the second pulse signal.

Abstract: This invention aims to achieve safety without interchanging an entire existing servo system to a servo system having the safety function. In a servo system including a servo motor, and a servo amplifier for controlling the drive of the servo motor based on the output of an encoder attached to the servo motor, a safety control device for monitoring presence of abnormality based on the output of the encoder, and shielding the supply of drive power to the servo motor if abnormality is present is arranged, and the monitoring content is set as setting information.

Abstract: Disclosed is a proximity switch provided with an actuator unit and a sensor unit. The sensor unit is provided with an antenna coil, a transmitting circuit which transmits electromagnetic waves at a constant frequency to the antenna coil, a receiving circuit which detects external signals received by means of the antenna coil, and control circuits. The actuator unit is provided with an antenna coil, a power supply circuit which rectifies an electromotive force generated in the antenna coil, and a signal processing circuit which receives power supply from the power supply circuit, performs frequency-dividing to the signals received by means of the antenna coil, and transmits the signals from the antenna coil after the frequency-dividing. The control circuit of the sensor unit has memory for registering the frequency of the signals transmitted from the actuator unit.

Abstract: A central magnet of a plurality of magnets arranged to be different in polarities is detected by two hall ICs; therefore, reduction in size can be achieved by reducing the number of the magnets; and at the same time, the number of the hall ICs can be maintained and the reliability can be secured, as compared with a configuration in which the magnets and the hall ICs individually respond in one to one correspondence.

Abstract: Safety units 1d to 1f for executing a safety function processing are connected to a non-safety controller constituted by connecting a plurality of units 1b, 1c including CPU units 1a. A CPU bus 10 to be connected with the CPU units and a safety dedicated bus 11 for mutually connecting the safety units are provided to the safety units. Since the safety dedicated bus is isolated from the non-safety system, reliability of the safety function can be secured. The CPU unit can read out data through the CPU bus irrespective of the safety unit and the non-safety unit.

Abstract: This invention aims to achieve safety without interchanging an entire existing servo system to a servo system having the safety function. In a servo system including a servo motor, and a servo amplifier for controlling the drive of the servo motor based on the output of an encoder attached to the servo motor, a safety control device for monitoring presence of abnormality based on the output of the encoder, and shielding the supply of drive power to the servo motor if abnormality is present is arranged, and the monitoring content is set as setting information.

Abstract: A safety controller provides a safety output to a target controlled system such as a magnet contactor based on an input from an input device such as a safety door switch to thereby control operation of machine equipment. Safety output parts serve to transmit a solid-state output as the safety output and a connection output part transmits a connection output to another safety controller. A control part having two CPUs controls the safety output and the connection output according to a program based on the input from the input device. Two or more of such safety controllers are connected through their connecting output parts and the connecting input parts to together form a safety system.

Abstract: Safety units 1d to 1f for executing a safety function processing are connected to a non-safety controller constituted by connecting a plurality of units 1b, 1c including CPU units 1a. A CPU bus 10 to be connected with the CPU units and a safety dedicated bus 11 for mutually connecting the safety units are provided to the safety units. Since the safety dedicated bus is isolated from the non-safety system, reliability of the safety function can be secured. The CPU unit can read out data through the CPU bus irrespective of the safety unit and the non-safety unit.

Abstract: Safety units 1d to 1f for executing a safety function processing are connected to a non-safety controller constituted by connectting a plurality of units 1b, 1c including CPU units 1a. A CPU bus 10 to be connected with the CPU units and a safety dedicated bus 11 for mutually connecting the safety units are provided to the safety units. Since the safety dedicated bus is isolated from the non-safety system, reliability of the safety function can be secured. The CPU unit can read out data through the CPU bus irrespective of the safety unit and the non-safety unit.

Abstract: A central magnet of a plurality of magnets arranged to be different in polarities is detected by two hall ICs; therefore, reduction in size can be achieved by reducing the number of the magnets; and at the same time, the number of the hall ICs can be maintained and the reliability can be secured, as compared with a configuration in which the magnets and the hall ICs individually respond in one to one correspondence.

Abstract: A network system is constructed by connecting a safety PLC constituting a master unit and safety slaves 2 to each other through a safety network 3. The safety slaves each have a device information storage unit 25 for storing individual information and status information of the safety devices connected. The individual information is acquired and stored in advance, while the stored contents of the status information are updated based on the result of monitoring the status of the safety devices in operation. These processes are executed by a MPU 23. In response to a request from the safety PLC, the device information stored are transmitted, so that the safety PLC can collect and manage the device state as well as the normal state of the slave units.

Abstract: A safety PLC 1 and at least a safety slave unit 2 are connected through a safety network 3. The safety slave unit has the safety information transmission function for transmitting the safety information for determining whether a safe state prevails or not and the unsafety information transmission function for transmitting the unsafety information containing no safety information. The unsafety information transmission function transmits the unsafety information on condition that the safety slave unit is in a safe state. Specifically, in the case where it is determined that no safe state prevails at the timing of transmitting the unsafety information, the unsafety information is not sent but the safety is transmitted. A safety controller, upon receipt of the unsafety information, estimates that the safety slave unit at the transmitting end of the particular unsafety information is in a safe state.

Abstract: A network system is constructed by connecting a safety PLC constituting a master unit and safety slaves 2 to each other through a safety network 3. The safety slaves each have a device information storage unit 25 for storing individual information and status information of the safety devices connected. The individual information is acquired and stored in advance, while the stored contents of the status information are updated based on the result of monitoring the status of the safety devices in operation. These processes are executed by a MPU 23. In response to a request from the safety PLC, the device information stored are transmitted, so that the safety PLC can collect and manage the device state as well as the normal state of the slave units.

Abstract: A safety controller provides a safety output to a target controlled system such as a magnet contactor based on an input from an input device such as a safety door switch to thereby control operation of machine equipment. Safety output parts serve to transmit a solid-state output as the safety output and a connection output part transmits a connection output to another safety controller. A control part having two CPUs controls the safety output and the connection output according to a program based on the input from the input device. Two or more of such safety controllers are connected through their connecting output parts and the connecting input parts to together form a safety system.

Abstract: Safety units 1d to 1f for executing a safety function processing are connected to a non-safety controller constituted by connectting a plurality of units 1b, 1c including CPU units 1a. A CPU bus 10 to be connected with the CPU units and a safety dedicated bus 11 for mutually connecting the safety units are provided to the safety units. Since the safety dedicated bus is isolated from the non-safety system, reliability of the safety function can be secured. The CPU unit can read out data through the CPU bus irrespective of the safety unit and the non-safety unit.

Abstract: A safety PLC 1 and at least a safety slave unit 2 are connected through a safety network 3. The safety slave unit has the safety information transmission function for transmitting the safety information for determining whether a safe state prevails or not and the unsafety information transmission function for transmitting the unsafety information containing no safety information. The unsafety information transmission function transmits the unsafety information on condition that the safety slave unit is in a safe state. Specifically, in the case where it is determined that no safe state prevails at the timing of transmitting the unsafety information, the unsafety information is not sent but the safety is transmitted. A safety controller, upon receipt of the unsafety information, estimates that the safety slave unit at the transmitting end of the particular unsafety information is in a safe state.

Abstract: Because a semiconductor relay system of this invention comprises an across-element voltage detecting circuit 116 which delivers an across-element voltage detection signal depending on the presence/absence of an across-element voltage exceeding a predetermined threshold; an element driving circuit 112 for delivering an element driving signal in response to a control input signal; a logic-based judgement circuit 119 for delivering a logic-based judgement signal depending on the presence/absence of an across-element voltage detection signal; and a filtration circuit for removing a logic-based judgement signal of external disturbing elements to produce an element safety check signal, it is possible to reliably detect the disorder of a triac 114.