Isolated digital signal output circuit and programmable logic controller

• Main Authors: LI HAIZHOU, WU ZHAOBIN, CHEN CHUPING, WU YUANYAO, WU HAN
• Format: Patent
• Language: Chinese; English
• Published: 11.03.2022
• Subjects: BASIC ELECTRONIC CIRCUITRY; CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; ELECTRICITY; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PHYSICS; PULSE TECHNIQUE; REGULATING

The embodiment of the invention provides an isolation type digital signal output circuit and a programmable logic controller, and an overcurrent protection circuit of the isolation type digital signal output circuit detects that the current of an output driving circuit is greater than a set current threshold value. An over-current protection self-locking control signal can be output to the isolation end signal modulation and control circuit to enable the isolation end signal modulation and control circuit to enter an over-current self-locking state, so that over-current detection and protection are realized, and the safety can be improved to a great extent; in addition, the isolated digital signal output circuit provided by the embodiment of the invention adopts a high-speed signal isolation circuit, and can support high-frequency pulse signals, so that the high-speed signal isolation circuit can be suitable for various application scenes, and the universality is better. 本发明实施例提供了一种隔离式数字信号输出电路及可编程逻辑控制器，隔离式数字信