| 摘要 |
PURPOSE:To eliminate erroneous selection of machine type by providing the machine type selection signal automatically through grounding of the earth terminal of the machine side wire furnace to be connected with the body thereby eliminating the switch operation for selecting the machine type. CONSTITUTION:The earth terminal 28 is connected with the wire 27 of the machine side wire furnace 11 and any one selection signal lines 17 to drop the voltage at the terminal 28 through the signal line 17 below that through other signal line 17. Combination of high and low voltages of these signal lines 17 is provided as the machine type selection signal H ane L to I/O interface 14 to read out necessary control data from ROM13 on the basis of said selection signal. Consequently, troublesome switch operation for selecting the machine type is not required at the field where the body 9 and the engine are connected electrically resulting in complete elimination of erroneous selection of machine type due to misoperation of switch. |
