| 摘要 |
A channel interface component (30) including redundancy within a control system with highway addressable remote transfer (HART) channels (100, 200) is provided. In one embodiment, a circuit includes: at least two highway addressable remote transfer (HART) channels (100, 200), each HART channel (100, 200) including an input terminal (105, 205) and an output terminal (110, 210) configured to connect with a HART device (25) via a current loop; an channel interface component (30) coupled to each HART channel (100, 200) that is configured to support HART protocol signals for communications with the HART device (25), wherein the channel interface component (30) includes a suicide relay switch (35) for connecting or disconnecting each HART channel (100, 200) from the HART device (25); and a programmable logic device (80) coupled to the channel interface component (30) that is configured to perform modulation and demodulation of HART protocol signals for communications with the HART device (25). |
