描述
梯形图编程语言习惯上叫梯形图。梯形图沿袭了继电器控制电路的形式，也可以说，梯形图编程语言是在电气控制系统中常用的继电器、接触器逻辑控制基础上简化了符号演变而来的，具有形象、直观、实用，电气技术人员容易接受，是目前用得最多的一种PLC编程语言。
Unused Allen Bradley Magnetic Overload Relay 810-NX53
Unused Allen Bradley Magnetic Overload Relay 810-NX56
ALLEN BRADLEY 1771-HR NSFP 1771HR
ALLEN BRADLEY 1771-HRA NSFP 1771HRA
520FCODA2HA2H NEW ALLEN BRADLEY 520F COD A2H A2H
One-day shipping available
FACTORY SEAL ALLEN-BRADLEY 1756-L55M13 1756L55M13 03/08
One-day shipping available
ALLEN BRADLEY 634978-9004 USPP 6349789004
ALLEN BRADLEY PANELVIEW 2711-T10C20 2711T10C20 ETHERNET
One-day shipping available
NEW ALLEN BRADLEY 1769-L35E COMPACTLOGIX PROCESSOR NEW
One-day shipping available
ALLEN BRADLEY 1775-MR8 CMOS RAM MEMORY 32K
ALLEN BRADLEY 2711-B6C15 USPP 2711B6C15
