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Section Memory Tables Symbol C-series PCs Allocation CV-series PCs Allocation CS1-series PCs 2-3 Allocation C TC Area, Counter PVs n1 Counter Area, Counter PVs n1 TC Area, Counter PVs n1 CU --- --- --- --- TC Area, Counter Completion Flags W --- --- --- --- WR Area n2 TK --- --- --- --- Task Flags D DM Area DM Area DM Area Area *2, E EM current bank EM Area, current bank n2 EM Area, current bank n2 E0_ to EC_ --- --- --- --- EM Area, EM banks 0 to C n2 : OK : NG n1 : 1-word tables only n2: Host link not available *1: Words LR 00000 to LR 00199 are converted to CIO 01000 to CIO 01199. *2: The EM Area is valid for the C200HX/HG/HE(-Z)E PCs only. The Auxiliary Area of the CVM1 and CV-series PCs is allocated to system functions, and it cannot be used for purposes other than system use. The range of each memory area differs according to the PC. Refer to Appendix D PC Memory Map on page 429. The relationships among the allocated words, the number of allocated words, and the contents of numeral memory tables are indicated in the figure below. When The Number of Allocated Words Is 1 Word PT PC Numeral memory table Only four digits read 5 6 7 8 ← Allocated word 162E 1 2 3 4 (Decimal number 5678) When The Number of Allocated Words Is Two Words PT Numeral memory table Eight digits read 00BC614E (Decimal number 12345678) PC 5 6 7 8 ← Allocated word 1 2 3 4 Storage Type and Stored Data Numeral memory tables internally store the specified number of words of data as signed binary data. When the the contents of words allocated in the host are stored in a memory table, the numeric value is interpreted according to the Storage Type setting and is stored after conversion to signed binary data. Also, the signed binary data in numeral memory tables is written to the words allocated in the host according to the Storage Type setting. Accordingly, different Storage Type settings will cause the same data to be recognized by the PT as different values and written to the host as different values. Reference: Signed binary data expresses negative values as the complement of two (the bits are inverted and 1 is added). • Storage Type For The BCD Format When using BCD format, the contents of the word(s) at the host are interpreted as BCD (binary coded decimal) data. However, since it is not possible to input a negative sign in a host word, the letter F at the most significant digit is used 66
