The paper presents the instructions of transform data DMPX and with one bit numbered switch of BCD to realize the setting up of the multitude and multibit timer.

• 本文提出利用数据变换指令DMPX和MLPX；只用一位BCD码开关；占用很少的输入点实现PLC多个、多位的定时器和计数器的外部设定.