西门子S7-300哪些24V数字量输入模块需要电源

西门子S7-300哪些24V数字量输入模块需要电源，与电源如何连接？下表说明了S7-300 plc的24V数字量输入模块的电源插针连接 (L+ / M) 。不在此表上的S7-300 PLC数字量输入模块不需要外部电源。
表1      S7-300 PLC模块电源连接插针分配
S7-300 PLC模块型号                                        电源连接L+                          电源连接M
6ES7 321-1BH00-0AA0                                   插针1                                   插针20
6ES7 321-1BH01-0AA0                                   插针1                                   插针20
6ES7 321-1BH02-0AA0                                   ---                                       插针20
6ES7 321-1BH81-0AA0                                   插针1                                   插针20
6ES7 321-7BH00-0AB0                                   插针1                                   插针20
6ES7 321-7BH01-0AB0                                   插针1                                   插针20
6ES7 321-7BH80-0AB0                                   插针1                                   插针20
6ES7 321-1BH50-0AA0                                   插针1                                   ---
6ES7 321-1BH02-0AA0                                   ---                                       插针20
6ES7 321-1BH10-0AA0                                   ---                                       插针20
6ES7 321-1BL00-0AB0                                    ---                                       插针20
6ES7 321-1BL80-0AB0                                    ---                                       插针40
6ES7326-1BK00-0AB0                                     插针1                                   插针21
                                                                        插针2                                   插针22
6ES7326-1BK01-0AB0                                     插针1                                   插针21