A
A-1 Channel/Relay Numbers
98
SYSMAC CP1L Getting Started Guide
Ap
pend
ix
z
Condition Flags
Condition flags are used to reflect the processing results during or after the
execution of instructions. Whether a flag is used or not will depend on the
instruction. These flags are used in ladder programs as contacts.
Name
Label
In CX-P
Function
Error flag
ER
P_ER
• Turns ON when an instruction handling BCD
data attempts to execute using non-BCD data.
• Turns ON when an operand value specified by
the instruction is invalid (e.g. a value outside
the work area).
Access error flag
AER
P_AER
Turns ON when unauthorized access is
attempted on an area that is not meant to be
accessed.
Carry flag
CY
P_CY
• Turns ON when the number of digits is
increased or decreased as a result of
executing an arithmetical instruction.
• Data shift instructions and some arithmetical
instructions may handle the carry as part of
their processing.
Equals flag
=
P_EQ
• Turns ON when data comparison returns an
"equal".
• Turns ON when data becomes 0 as a result of
calculations or transfers.
Unequal flag
< >
P_NE
Turns ON when data comparison returns an
"unequal".
Greater than flag
>
P_GT
Turns ON when data comparison returns
"data1>data2".
Greater than or
equals flag
>=
P_GE
Turns ON when data comparison returns
"data1>=data2".
Less than flag
<
P_LT
Turns ON when data comparison returns
"data1<data2".
Less than or
equals flag
<=
P_LE
Turns ON when data comparison returns
"data1=<data2".
Negative flag
N
P_N
Turns ON when the MSB becomes 1 as a result
of calculations.
Overflow flag
OF
P_OF
Turns ON when the calculation result overflows.
Underflow flag
UF
P_UF
Turns ON when the calculation result
underflows.
Always ON flag
ON
P_ON
Remains ON at all times. Used as an execution
condition for instructions that cannot be
connected directly to the bus bar.
Always OFF flag
OFF
P_OFF
Remains OFF at all times.
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