| 摘要 |
A CPU unit 2 has a liquid crystal display screen 10, a plurality of operation keys 12, and the like. Each of expansion units 3 to 8 has a push switch button 14. For example, when an operator pushes the switch button 14-1 of the ID-1 unit 3, information concerning the unit 3 is displayed on the liquid crystal screen 10. Next, the operator operates one of the predetermined operation keys 12 of the CPU unit 2, whereby the display contents of the screen 10 are removed and another piece of information concerning the unit 3 is displayed.
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