描述
继电器控制线路是由许多真正的硬件继电器组成的。而PLC是由许多“软继电器”组成的，这些“继电器”实际上是存储器中的触发器，可以置“0”或置“1”。硬继电器的触点数有限，一般只有4至8对；而“软继电器”可供编程的触点数有无限对，因为触发器状态可取用任意次。
NEW REXROTH MANNESMANN M-15BFD-60 PNEUMATIC CYLINDER
MannesMann Rexroth 4WE6D60/EG24N9Z45 Directional Valve
MANNESMANN REXROTH 3WE6A61/EW110N9DAL DIRECTIONAL VALVE
MANNESMANN REXROTH 535-262-010-0 USPP 5352620100
REXROTH MANNESMANN HYDRAULIC VALVE- ZDR6DP2-43/75YM/12
Mannesmann Rexroth Pneumatic Fittings P-068949 B696
MANNESMANN REXROTH PG-007827-00000 NSPP PG00782700000
Mannesmann RexRoth 5210460002 Cylinder Repair Kit New
MANNESMANN REXROTH 00459822 USPP 00459822
MANNESMANN REXROTH PW67697-1 NSFP PW676971
