5-15
5 I/O Memory
CP1E CPU Unit Software User’s Manual(W480)
5-7 Counter Area (C)
5
5-7 Counter Area (C)
The Counter Area contains Completion Flags (1 bit each) and counter PVs (16 bits each). A Comple-
tion Flag is turned ON when the counter PV reaches the set value (counting out).
Precautions for Safe Use
With an E-type CPU Unit or with an N/NA-type CPU Unit without a Battery, the contents of the
DM Area (D) *, Holding Area (H), the Counter Present Values (C), the status of Counter Comple-
tion Flags (C), and the status of bits in the Auxiliary Area (A) related to clock functions may be
unstable when the power supply is turned ON.
* This does not apply to areas backed up to EEPROM using the DM backup function.
If the DM backup function is being used, be sure to refer to 3-2-4 Initializing I/O Memory at Star-
tup for details.
Counter numbers range from C0 to C255.
.
Types of Counters
The following table shows which instructions are used to refresh counter PVs in BCD and binary
mode.
Counter numbers 0 to 255 are used by all counters given above.
The refresh method for counter PVs can be set from the CX-Programmer to either BCD or binary.
Built-in high-speed counters 0 to 5 do not use counter numbers.
Overview
Notation
Range
Details
Counter instruction BCD mode Binary mode
COUNTER CNT CNTX
REVERSIBLE COUNTER CNTR CNTRX
C 002
Counter number: 002
I/O memory area designator: C
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