| 摘要 |
<p>PURPOSE: A slave unit with a measuring means is provided which obtains the operating time of devices as service information without affecting the control system on the PLC side, and specifically is able to precisely measure, on the slave side, time based on operations, such as operating time, waiting time, etc. of output and input devices connected to the slave. CONSTITUTION: The device includes the transmission and reception circuit(13a), MPU(13b) connected to the transmission and reception circuit(13a), output circuit(13c) connected to the output devices, and input circuit(13d) connected to the input devices. The transmission and reception circuit(13a) has the capability of receiving a frame flowing on the field network(12), judging by analyzing a header part if the frame is addressed to it, and finally accepting frames only addressed to it and passing them to the MPU(13b), and the capability of outputting onto the field network(12) transmission frames provided by the MPU(13b). MPU(13b) executes predetermined processing according to information stored in a data unit of received frames provided by the transmission and reception circuit(13a), basic capability of which is to issue a control signal to turn predetermined OUT terminal ON/OFF to the output circuit(13a) according to OUT data in a data part, and also has the capability of obtaining ON/OFF state of the input terminal by way of the input circuit(13d), generating a frame to transmit, as IN data, that obtained information to the master unit, and passing it to the transmission and reception circuit(13a).</p> |
