SINGLE-WIRE INDUSTRIAL SAFETY SYSTEM WITH SAFETY DEVICE DIAGNOSTIC COMMUNICATION

摘要

A single-wire safety system architecture is provided that yields reliable safety device monitoring without the need for dual redundant signal channels. The safety system comprises a safety relay acting as a communications master device and one or more compatible safety devices connected in series with the safety relay via a single-wire communication circuit. The safety device farthest from the safety relay on the safety circuit modulates a safety signal with a recognizable pulse pattern that traverses the single-wire safety circuit to the safety relay via the intermediate safety devices. The safety relay maintains safety mode as long as the pulse pattern is received and recognized. The architecture allows bi-directional communication of initialization, configuration, and diagnostic messages over the single-wire safety channel, and can also allow safety devices to insert prognostic data into the safety signal in order to convey health information while the system is in normal operation mode.

主权项

1. A safety device, comprising:
a memory that stores executable components; a processor, operatively coupled to the memory, that executes the executable components, the executable components comprising:
a safe state detection component configured to determine whether the safety device is in a safe state;a pulse detection component configured to verify that a modulated pulse pattern contained in a safety signal portion of a safety signal received on an input terminal of the safety device corresponds to a defined pulse pattern;a status word control component configured to write device status data to a device data portion of the safety signal; anda safety signal relaying component configured to output the safety signal on an output terminal of the safety device in response to verification that the modulated pulse pattern corresponds to the defined pulse pattern and a determination that the safety device is in the safe state.