| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a field equipment which can be used for both of an electric current superposition signal transmission type control plant and a non-electric current superposition signal transmission type control plant and with which correct control of the control plants can be performed. <P>SOLUTION: A field equipment configured to superpose and transmit digital communication signals to an upper equipment via an analog 2 line transmitter has a switch with which the communication signal system can be selectively switched ON/OFF. <P>COPYRIGHT: (C)2012,JPO&INPIT |
