不好意思，刚刚收到的OMRON 官方解释：
Omron official explanation:
Because of the nature of the common <,=,> flags, in certain situations, unexpected results could occur with the use of @CMP. Therefore to avoid these results we offer thwe folowing recommendations.
Recommendations:
1) Please do not use @CMP. Use only CMP.
2) If you use @CMP, please do not use @CMP after CMP.
Note for Equal flag 25506:
When MOV #0000 Source chanel is executed, this flag turns on. Equal flag of the ladder turns on, therefore, we have to inhibit the output of CMP, when condition is turned on at the moment. The combination and order of ladder program is to be also taken care by knowing the behavior of the flag.
