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Download 1775-6.4.1, PLC-3 Family Programmable Controller, Programming
Transcript
Chapter 5 Using Timers and Counters Figure 5.11 Memory Storage for Counters Data Table O000 Output Image Table Octal Word Address O377 I 000 Input Image Table I 377 T 0000 Timer Table Decimal Word Address T9999 ÉÉÉÉÉÉÉÉÉÉ C0000 C0002 Counter Table Up to 10,000 counters with each counter consisting of three words C9999 16–Bit Word ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ 17 16 15 14 13 CU CD DN OV UF 12 11 10 07 06 05 04 03 02 01 00 RESERVED 1RANGE –32.768 – +32.767 Preset Word (CPRE) 1RANGE –32.768 – +32.767 Accumulated Word (CACC) CU = Counter up enable bit CD = Counter down enable bit DN = Counter done bit OV = Counter overflow bit UF = Counter underflow bit 1Negative numbers stored in two’s complement form 5-14 Control Word (CCTL)
