| 摘要 |
<p>PURPOSE: To previously recognize the failure of a slave ID which backs up a master ID. CONSTITUTION: A dolly 1 which transfers a work is provided with a master ID 2 which communicates with a transmission/reception device 1 provided at each stage and a slave ID 3 which functions when the ID 2 has a failure. The ID 3 has a function to output a normal signal if its on function is normal, and the ID 2 has a function to receive the normal signal from the ID 3 and to recognize the state of the ID 3.</p> |
