Jtekt Corporation

Abb Ag

Elan Schaltelemente Gmbh & Co Kg

Abb Patent Gmbh

K. A. Schmersal Gmbh & Co., Kg

Michael Niehaus

Sutemaro Kato

Tsutomu Araki

Kuniyuki Niwa

Sönke Kock

Soenke Kock

Hirofumi Kato

Christoph Stratmann

Friedrich Adams

Makoto Kawamura

Manfred Kramer

Jan Bredahl

Peter Eriksson

Frank Müller

Thomas Rühl

Jan Brehdahl

Tsutomu Jtekt Corporation Araki

Sutemaro Jtekt Corporation Kato

A system and method for changing safety-relevant data for a control device is provided wherein an authorized user inputs new or altered safety-relevant data, which is received on a data processing installation. A first checksum for the safety-relevant data is established and stored along with the safety-relevant data in at least one data record on the data processing installation. An enable code may also be stored in the at least one data record. This enable code may be produced by a code generator and encrypted by a key module. The data processing installation then reads back the safety-relevant data from a memory in the data processing installation, thereby allowing a comparison of the received safety-relevant data and the read back safety-relevant data. A second checksum is generated in a case where the comparison resulted in no differences. The second checksum may also be stored in the at least one data record. At least one new data record containing the safety-relevant data, the encrypted enable code and the first and second checksums is created and transmitted to the control device. The new data record is checked against prior data records and prior checksums stored on a storage medium to determine that the at least one new data record is known to the control device.

Method and system for changing safety-relevant data for a control device

A PLC for distributed control includes a storage unit that stores common-data specifying information for specifying common data shared by a corresponding PLC and another PLC, a receiving unit that receives the common-data specifying information from another PLC, and a collating unit that collates the common-data specifying information stored in the storage unit with the common-data specifying information received by the receiving unit.

PLC for distributed control and distributed control system

A safety control device for ensuring safety of an object to be controlled, including: communication unit which is used for communication with another safety control device and uses a frame including a test bit string T having correlation with a base bit string B; and detection unit which compares with the base bit string B the test bit string T included in a frame having been received from another safety control device, thereby determining the number of bit errors in the frame.

Safety control device, safety control system, and method for detecting communication error

A safety PLC having duplex power supply circuits, includes: a first output-stage transistor; a first DC power supply that drives the first output-stage transistor; a second output-stage transistor; a second DC power supply that drives the second output-stage transistor; a signal transfer path that includes a resistor and connect the first output-stage transistor to the second output-stage transistor; and a pair of overvoltage protection units, each of which is disposed between a pair of output terminals of the corresponding one of the first and second DC power supplies and restricts the maximum value of an output potential difference between the pair of output terminals.

Safety PLC

Growing community of inventors

Florstadt, Germany

Michael Niehaus