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3 PLC存储器类型及容量选择
PLC系统所用的存储器基本上由PROM、E-PROM及PAM三种类型组成，存储容量则随机器的大小变化，一般小型机的***大存储能力低于6kB，中型机的***大存储能力可达64kB，大型机的***大存储能力可上兆字节。使用时可以根据程序及数据的存储需要来选用合适的机型，必要时也可专门进行存储器的扩充设计。
PLC的存储器容量选择和计算的***种方法是：根据编程使用的节点数***计算存储器的实际使用容量。第二种为估算法，用户可根据控制规模和应用目的，按照表4的公式来估算。为了使用方便，一般应留有25%～30%的裕量，获取存储容量的***佳方法是生成程序，即用了多少字。知道每条指令所用的字数，用户便可确定准确的存储容量。表４同时给出了存储器容量的估算方法。
Siemens Sinumerik PCU 50.5-C 6FC5210-0DF52-2AA0
Siemens Sinumerik 810D CPU 6FC5410-0AX02-1AA0 CCU2/DP
Siemens Sinumerik PCU 50 566MHz 256MB 6FC5210-0DF21-0AA0
Siemens NCU 572.2 2MB Profib. DP 6FC5357-0BA21-1AE1
Siemens Simodrive 6SN1145-1BA02-0CA1 E/R
Siemens D 380-D430/60 A M5 REQ 45KVA 6SC6506-4AA01
Siemens 6SN2703-2AA03-0BA0
Siemens Sinumerik 840D sl 6FC5372-0AA00-0AA0 NCU 720.1
Siemens Sinumerik 810D 6FC5447-0AA00-0AA1
Siemens Simodrive 611 6SN1145-1BA01-0BA2
Siemens Sinumerik 6FC5303-1AF02-8AE0 MPP 483 HTC-S05
Siemens ADI4 6FC5211-0BA01-0AA3
Siemens Simodrive 6SN1118-0BJ11-0AA0
Siemens Simodrive 6SN1118-0DB11-0AA0
Siemens Simodrive 6SN1145-1BA01-0BA2
Siemens Simodrive 6SN1121-0DA11-0AA0
Siemens Sinumerik MCP 483C KEY MPI 6FC5203-0AF22-0AA2
Siemens Simodrive Int. 160A 6SN1123-1AA00-0EA2
Siemens Simodrive 6SN1118-1NJ01-0AA0
Siemens Simodrive 6SN1118-1NK01-0AA0
Siemens Simodrive LT-Modul Int. 160A 6SN1123-1AA00-0EA1
Siemens Sinumerik 6FC5203-0AB00-0AA0 840D
Siemens Sinumerik OP012 6FC5203-0AF02-0AA1
Siemens Simodrive 6SN1124-1AA00-0EA1
Siemens 6FC5312-0DA00-0AA2 TCU 20.2
Siemens Simodrive 6SN1123-1AB00-0CA3
Siemens Simodrive 611 6SN1145-1BA01-0BA1
Siemens Simodrive 611 6SN1145-1BA01-0BA1
Siemens 6SN2132-1BC11-1BA0
Siemens Simodrive 6SN1123-1AB00-0BA2
Siemens 6SN2132-0AA11-1BA0
Siemens Simodrive 6SN1130-1DB11-0BA0
Siemens Simodrive 6SN1123-1AB00-0CA3
Siemens Simodrive 6SN1123-1AB00-0CA2
Siemens Sinumerik 77-694-3300 6FC5147-0AA14-1AA2
Siemens Sinumerik 6FC5203-0AF27-1AA0-Z
Siemens Simodrive 6SC6190-0FB00 610
Siemens Simodrive 6SN1123-1AA00-0DA1
Siemens Simodrive 6SN1123-1AA00-0DA0
Siemens Simodrive 6SN1122-0BA12-0AA0
Siemens Simodrive 6SN1123-1AA00-0DA1
Siemens Simodrive 6SN1123-1AA00-0DA1 LT-Modul Int. 80A
Siemens Simodrive 611 U/E Modul 10/25kW 6SN1145-1AA01-0AA1
Siemens Simodrive 6SN1123-1AB00-0BA1
Siemens Simodrive 6SN1145-1AA01-0AA0
Siemens Simodrive 6EW1890-1AB
Siemens Simodrive 6SN1118-1NH01-0AA1
Siemens Simodrive 6SN1123-1AB00-0BA1