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5 I/O Memory
Counter Area (C)
There are two parts to the Counter Area: the Counter Completion Flags and the Counter Present
Values (PVs).
Up to 256 counters with counter numbers C0 to C255 can be used.
These words retain their content when the PLC is turned ON or the operating mode is switched
between PROGRAM mode and RUN or MONITOR mode.
This data is unstable if power is reset, when the battery is not mounted.
• Counter Completion Flags
Each Counter Completion Flag is accessed as one bit using the counter number.
A Completion Flag is turned ON when the set value of the counter is reached.
• Counter PVs
Each counter PV is accessed as one word (16 bits) using the timer number.
The PVs count up or down as the counter operates.
Refer to 5-7 Counter Area (C)
System Areas
System Areas contain bits and words with preassigned functions.
Auxiliary Area (A)
The words and bits in this area have preassigned functions.
Refer to A-2 Auxiliary Area Allocations by Address
Condition Flags
The Condition Flags include the flags that indicate the results of instruction execution, as well as the
Always ON and Always OFF Flags.
The Condition Flags are specified with global symbols rather than with addresses. For example: P_on
Clock Pulses
The Clock Pulses are turned ON and OFF by the CPU Unit's internal timer.
The Clock Pulses are specified with global symbols rather than with addresses. For example: P_0_02
5-4
CP1E CPU Unit Software User's Manual(W480)
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