目的：研究视频显示终端（VDT）脉冲磁场对细胞间隙连接通讯功能的影响。
Objective:To study the effects of VDT pulse magnetic field on gap junctional intercellular communication.
和STEP7的定时器都具有接通延时、断开延时、保持接通延时、边缘触发延时和脉冲输出功能，LOGO！
Both of the timer LOGO! and STEP7 have the function of on-delay, off-delay, retentive on-delay and edge-triggered interval time-delay. LOGO!
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