Omron CJ2 CPU UNIT SOFTWARE User Manual page 209

Area name
Timer Timer Comple-
Areas tion Flag Area
(T)
Timer PV Area
(T)
Counter Counter Com-
Areas pletion Flag Area
(C)
Counter PV Area
(C)
Task Flag Area (TK)
Index Registers (IR)
Data Registers (DR)
Condition Flags
Clock Pulses
*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 the
Work Area first.
CJ2 CPU Unit Software User's Manual
A Completion Flag is turned ON when the set time of the timer elapses.
The PV of a timer increases or decreases as the timer operates.
A Completion Flag is turned ON when the set value is reached or counted down
to zero.
The PVs of a counter is incremented or decremented as the counter operates.
A Task Flag is ON when the corresponding cyclic task is in READY status.
Index registers are used to store PLC memory addresses (absolute memory
addresses in RAM) to indirectly address I/O memory words.
Data registers are used to offset the PLC memory addresses in Index Registers
when addressing words indirectly.
Condition Flags are special flags, such as the Error Flag and Carry Flag, that
show the results of executing instructions.
The clock pulses are special flags that turn ON and OFF at regular intervals.
Description
6 I/O Memory Areas
Reference
6-32
6-34
6-35
6-36
6-41
6-43
6-45
6-3
6