描述
根据PLC梯形图程序扫描原则，按先左后右先上后下的步序，逐句扫描，执行程序。遇到程序跳转指令，根据跳转条件是否满足来决定程序的跳转地址。从用户程序涉及到输入输出状态时，PLC从输入映象寄存器中读出上一阶段采入的对应输入端子状态，从输出映象寄存器读出对应映象寄存器，根据用户程序进行逻辑运算，存入有关器件寄存器中。对每个器件来说，器件映象寄存器中所寄存的内容，会随着程序执行过程而变化
Tektronix P7380 8.0GHz Differential Probe Tested
Tektronix ORS622 SDH/Sonet Receiver Optical
Calibrated, 30-day warranty/14-day right of return
P6964 Tektronix 34 Channel Logic Analyzer Probe
Tektronix VX4224 High Performance Counter w/opt. 10,30
Tektronix P6964 34 Channel Logic Analyzer Probe
TEKTRONIX/SONY AWG2021 WITH OPTION 1R /NIST CALIBRATION
Tektronix DPO4032 Dig. Oscilloscope INCOMPLETE DPO4000
Tektronix VX4236 6.5 DIGIT DIGITAL MULTIMETER
Tektronix VX4802 80 Channel Digital IO Module
Tektronix OF152 Fiber Optic TDR Reflectometer Multimode
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