6AV6641-0CA01-0AX1 6AV6641-0CA01-0AX1
用户存储器
用以存放用户程序即存放通过编程器输入的用户程序。PLC的用户存储器通常以字（16位/字）为单位来表示存储容量。同时，由于前面所说的系统程序直接关系到PLC的性能，不能由用户直接存取。因而通常PLC产品资料中所指的存储器型式或存储方式及容量，是对用户程序存储器而言。
常用的用户存储方式及容量型式或存储方式有CM0SRAM，EPR0M和EEPR0M。信息储存常用盒式磁带和磁盘。
CM0SRAM存储器是一种中高密度、低功能、价格便宜的半导体存储器，可用锂电池作为备用电源。一旦交流电源停电，用锂电池来维持供电，可保存RAM内停电前的数据。锂电池寿命一般为1―5年左右。
| ABB变频器 | DCS800-S01-2050-06 | 西门子驱动器 |
| DCS800-S01-0020-05 | DCS800-S02-0025-05 | 6SN1118-1NH01-0AA1 |
| DCS800-S01-0045-05 | DCS800-S02-0050-05 | 6SN1118-1NJ00-0AA0 |
| DCS800-S01-0065-05 | DCS800-S02-0075-05 | 6SN1118-1NJ00-0AA1 |
| DCS800-S01-0090-05 | DCS800-S02-0100-05 | 6SN1118-1NJ00-0AA2 |
| DCS800-S01-0125-05 | DCS800-S02-0140-05 | 6SN1118-1NJ01-0AA0 |
| DCS800-S01-0180-05 | DCS800-S02-0200-05 | 6SN1118-1NJ01-0AA1 |
| DCS800-S01-0230-05 | DCS800-S02-0260-05 | 6SN1118-1NK00-0AA0 |
| DCS800-S01-0290-06 | DCS800-S02-0290-06 | 6SN1118-1NK00-0AA1 |
| DCS800-S01-0290-07 | DCS800-S02-0290-07 | 6SN1118-1NK00-0AA2 |
| DCS800-S01-0315-05 | DCS800-S02-0350-05 | 6SN1118-1NK01-0AA0 |
| DCS800-S01-0405-05 | DCS800-S02-0450-05 | 6SN1118-ODM33-0AA1 |
| DCS800-S01-0470-05 | DCS800-S02-0520-05 | 6SN1122-0BA11-0AA1 |
| DCS800-S01-0900-06 | DCS800-S02-0900-06 | 6SN1123-1AA00-0BA0 |
| DCS800-S01-0900-07 | DCS800-S02-0900-07 | 6SN1123-1AA00-0BA1 |
| DCS800-S01-1500-06 | DCS800-S02-1500-06 | 6SN1123-1AA00-0DA2 |
| DCS800-S01-1500-07 | DCS800-S02-2000-06 | 6SN1123-1AA00-0KA2 |
| DCS800-S01-2050-05 | DCS800-S02-2000-07 | 6SN1123-1AB00-0BA1 |
EPR0M存储器是一种常的只读存储器，定入时加高电平，擦除时用紫外线照射。PLC通过写入器可将RAM区的用户程序固化到R0M盒中的EPR0M中去。在PLC机中插入R0M盒，PLC则执行R0M盒中用户程序；反之，不插上R0M盒，PLC则执行RAM区用户程序。
EEPR0M存储器是一种可用电改写的只读存储器。
| 西门子显示屏 | 6AV6647-0AE11-3AX0 |
| 6AV3607-1JC00-0AX1 | 6AV6648-0AE11-3AX0 |
| 6AV3607-1JC20-0AX1 | 6AV6648-0BC11-3AX0 |
| 6AV3607-1JC30-OAX1 | 6AV6 671-8XB10-0AX1 |
| 6AV3627-1QK00-2AX0 | 6AV6545-0BA15-2AX0 |
| 6AV3688-3CD13-0AX0 | 6AV6545-0BB15-2AX0 |
| 6AV3688-3ED13-0AX0 | 6AV6545-0DA10-0AX0 |
| 6AV6542-0AG10-0AX0 | 6AV6640-0AA00-0AX1 |
| 6AV6542-0BB15-2AX0 | 6AV6640-0CA01-0AX0 |
| 6AV6542-0CA10-0AX0 | 6AV6641-0AA11-0AX0 |
| 6AV6542-0CC10-0AX0 | 6AV6641-0CA01-0AX1 |
| 6AV6545-0BA15-2AX0 | 6AV6642-0AA11-0AX1 |
| 6AV6545-0BB15-2AX0 | 6AV6642-0BA01-1AX0 |
| 6AV6545-0BC15-2AX0 | 6AV6642-0BA01-1AX1 |
| 6AV6545-0CC10-0AX0 | 6AV6642-0BC01-1AX1 |
| 6AV6545-0DA10-0AX0 | 6AV6642-0BD01-3AX0 |
| 6AV6640-0DA11-0AX0 | 6AV6642-0DA01-1AX1 |
| 6AV6641-0CA01-0AX1 | 6AV6642-0DC01-1AX1 |
| 6AV6642-0AA11-0AX0 | 6AV6642-0EA01-3AX0 |
| 6AV6642-0AA11-0AX1 | 6AV6643-0AA01-1AX0 |
| 6AV6642-0BA01-1AX1 | 6AV6643-0BA01-1AX0 |
| 6AV6642-0BC01-1AX1 | 6AV6643-0CD01-1AX1 |
| 6AV6642-OBC01-1AX1 | 6AV6-643-0CD01-1AX1 |
| 6AV6643-0AA01-1AX0 | 6AV6643-0DD01-1AX1 |
| 6AV6643-0CD01-1AX1 | 6AV6644-0AA01-2AX0 |
| 6AV6643-0DB01-1AX1 | 6AV6644-0AB01-2AX0 |
| 6AV6644-0BA01-2AX0 | 6AV6644-OAC01-2AX1 |
| 6AV6647-0AA11-3AX0 | 6AV6647-0AA11-3AX0 |
| 6AV6647-0AC11-3AX0 | 6AV6647-0AD11-3AX0 |
| 6AV6647-0AE11-3AX0 | 6AV6648-0BC11-3AX0 |
| 6AV6647-0AF11-3AX0 | 6AV6671-5AE10-0AX0 |
| 6AV6647-0AG11-3AX0 | 6AV7856-0AE20-1AA0 |
| 6AV6647-0AH11-3AX0 | 6AV8100-0BB00-0AA1 |
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