Transmitter for transmitting process variable to programmable logic controller

• Main Authors: ANTONOVIC, DORIN, WALTER HEINZ
• Format: Patent
• Language: Chinese; English
• Published: 29.03.2022
• Subjects: CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PHYSICS; REGULATING

The invention relates to a transmitter for transmitting a process variable to a programmable logic controller, in which a current of 4-20 mA is fed into a load (1) in a current mode and a signal of 0-10 V is generated in a voltage mode, the transmitter comprises a process value input (2), a current stage (3), a voltage stage (4) and a U/I output (5) for a current or voltage signal, and a U/I control input (6, 6a, 6b) for switching between two modes. According to the invention, the transmitter is configured to feed a current dependent on the voltage across the load (1) into the current stage (3) via the resistor (7), thereby compensating for current losses at the voltage stage (4) dependent on the voltage across the load (1). 本发明涉及一种用于将过程变量传送到可编程逻辑控制器的变送器，其中，在电流模式下，4-20mA的电流被馈送到负荷(1)中，并且在电压模式下，生成0-10V的信号，变送器包括过程值输入端(2)、电流级(3)、电压级(4)和用于电流或电压信号的U/I输出端(5)、以及用于在两种模式之间切换的U/I控制输入端(6、6a、6b)。根据本发明，变送器被配置为将取决于负荷(1)两端的电压的电流经由电阻器(7)馈送到电流级(3)中，由此补偿电压级(4)处的取决于负荷(1)两端的电压的电流损耗。