SIMATIC DP，总线模块，针对 ET 200M 用于安装两个 40mm 宽的周边组件 针对插拔功能
订货号：
| 有源背板 | 6ES71957HA000XA0 | ET200M, BUS UNIT For PS AND IM 153 |
| 6ES71957HB000XA0 | ET200M, BUS UNIT For 2×40MM I/O MODULES | |
| 6ES71957HC000XA0 | ET200M, BUS UNIT For 1×80MM I/O MODULE | |
| 6ES71957HD100XA0 | ET200M, BUS UNIT For 2×IM 153-2 RED. |
