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PLC Memory and optimization Joint Use of IEC and LL984 When using IEC and LL984 jointly, you should harmonize the sizes of both zones with each other. By setting the total IEC memory size and Global Data you can automatically determine the size of the IEC program memory, and also the available space for LL984-data (user program). The size of the available memory for LL984 user programs is calculated using the following formula: LL984 zone = available LL984 nodes - total IEC memory When performing this calculation, it must however be ensured that the size of the LL984 zone is node-oriented and the remaining instructions are kilobyte-oriented. To set the total IEC memory, select from Project → PLC Configuration → PLC selection in the IEC Operating System list box, the Enable entry. The IEC zone is now enabled and you can enter the required memory size in the Total IEC Memory text box. The memory size is given in kilobytes. The fixed total IEC memory size is again made up of several zones. You will find the explanation of how to harmonize these zones vertically in the chapter Harmonizing the Zones for Global Data and IEC Program Memory (Compact), p. 193. 33002204 191
