Appendix Programming Information
1261
1)
The number of points noted above is the number reserved as the calculation memory. The actual number of
points available for use is determined by the hardware configuration.
2)
If no battery is used, only the fixed area is backed up.
Counter relays: 16 (C1008–C1023)
Internal relays: 128 (R900–R97F)
Data registers: DT32710–DT32764.
If the optional battery is used, the data in the hold and non-hold areas specified in the system registers will
be backed up.
If the battery is empty or no battery is present and additional hold areas have been defined, the
hold/non-hold operation becomes unstable. The data value will become indefinite. It is not cleared to 0 the
next time the power is turned on. Do not forget to monitor the battery status or to reset the hold areas to the
default values if no battery is used. See.
3)
The number of points for timer and counter relays can be changed using system register 5. The numbers in
the table are the default settings.
40.7.4 Relays and memory areas for FP-X
Relays [bits]
Available address area Type Memory
size
F/P IEC
Function
External input relays
1)
1760 X0–X109F %IX0.0–
%IX109.15
Turn on or off based on external
input.
External output relays
1)
1760 Y0–Y109F %QX0.0–
%QX109.15
Turn on or off external outputs
based on the operation result.
Internal relays
2)
4096 R0–R255F %MX0.0.0–
%MX0.255.15
Used internally by the PLC
program to store bit information.
Link relays
2)
2048 L0–L127F %MX7.0.0–
%MX7.127.15
Shared by multiple PLCs
connected using PLC link.
Timer relays
2)
3)
1024 T0–T1007/
C1008–C1023
%MX1.0–
%MX1.1007/
%MX2.1008–
%MX2.1023
Turn on when the value set with
a TM instruction for the timer with
the same number has reached 0.
Counter relays
2)
3)
1024 C1008–C1023/
T0–T1007
%MX2.1008–
%MX2.1023/
%MX1.0–
%MX1.1007
Turn on when the value set with
a CT instruction for the counter
with the same number has
reached 0.
Special internal relays 192 R9000–R911F %MX0.900.0–
%MX0.911.15
Turn on or off based on specific
conditions. Used internally as a
flag.
Memory area [words]
Available address area Type Memory
size
F/P IEC
Function
External input relays
1)
110 WX0–WX109 %IW0–
%IW109
Code for specifying 16 external
input points as one word (16 bits)
of data.
External output relays
1)
110 WY0–WY109 %QW0–
%QW109
Code for specifying 16 external
output points as one word (16
bits) of data.
Internal relays
2)
256 WR0–WR255 %MW0.0–
%MW0.255
Code for specifying 16 internal
relays as one word (16 bits) of
data.
Link relays 128 WL0–WL127 %MW7.0–
%MW7.127
Code for specifying 16 link relays
as one word (16 bits) of data.
Data
registers
2
C14 12285 DT0–DT12284 %MW5.0–
%MW5.12284
Data memory used in a program.
Data is handled in 16-bit units
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