我看了英文：
The Load Sequence Control Relay (LSCR) instruction loads the SCR and logic stacks with the value of the S bit referenced by the instruction (N). The SCR segment is energized or de-energized by the resulting value of the SCR stack. The value of the SCR stack is copied to the top of the logic stack so that boxes or output coils can be tied directly to the left power rail without an intervening contact.
英文写得就有问题，比如说“ by the instruction (N)”，帮助的中文基本上是“硬”翻译过来的。经实验可知SCR区内的线圈不能直接连到左侧电源母线上，必须经过一个SM0.0的常开触点。
我也建议不要使用SCR编顺序控制程序，用置位、复位指令最好。