Siemens SIMATIC S7-300 Series Reference Manual

Also see for Simatic S7-300: User manual Getting started Technical data Operating instructions Installation manual

Contents

CPUs1-6 PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DPA5E00111190-011.1.4 Memory cardExceptionsYou cannot insert a memory card with the CPUs 312 IFM and 314 IFM (-5AE0x).These CPUs have an integrated read-only memory.Purpose of the Memory CardWith the memory card, you can expand the load memory of your CPU.You can store the user program and the parameters that set the responses of theCPU and modules on the memory card.You can also back up your CPU operating system to a Memory Card. exceptCPU 318-2.If you store the user program on the memory card, it will remain in the CPU whenthe power is off even without a backup battery.Available Memory CardsThe following memory cards are available:Table 1-3 Memory CardsCapacity Type Remarks16 KB32 KB The CPU supports the following functions:64 KB Loading of the user program on themodule into the CPU256 KBmodule into the CPUWith this function, the memory of the128 KB 5 V FEPROMWith this function, the memory of theCPU is reset, the user program is512 KB downloaded onto the memory card, andthen uploaded from the memory card to1 MBthen uploaded from the memory card tothe CPU’s RAM.2 MB Copying RAM data to ROM (not withCPU318-3182)4 MBCPU318-3182)128 KB256 KB512 KB 5 V RAM Only with the CPU 318-21 MB2 MB