CJ2 CPU Unit Software User's Manual - CIP ETI

6 I/O Memory AreasCounterAreasArea name Description ReferenceCounter CompletionFlag Area(C)A Completion Flag is turned ON when the set value is reached or counted downto zero.Counter PV Area The PVs of a counter is incremented or decremented as the counter operates.(C)Task Flag Area (TK) A Task Flag is ON when the corresponding cyclic task is in READY status. 6-34Index Registers (IR) Index registers are used to store PLC memory addresses (absolute memory 6-35addresses in RAM) to indirectly address I/O memory words.Data Registers (DR) Data registers are used to offset the PLC memory addresses in Index Registers 6-40when addressing words indirectly.Condition FlagsCondition Flags are special flags, such as the Error Flag and Carry Flag, that 6-42show the results of executing instructions.Clock Pulses The clock pulses are special flags that turn ON and OFF at regular intervals. 6-44*1 There are two areas that provide work bits: The Internal I/O Area in the CIO Area and the Work Area. Use word bits in theWork Area first.6-3366-1 I/O Memory Areas6-1-1 I/O Memory Area OverviewCJ2 CPU Unit Software User’s Manual6-3