Appendix
FPΣ User's Manual
290
12.5 Relays and Memory Areas
Relays [bits]
Available address area
Type
Memory
size
FP IEC
Function
External input
relays
1)
1184 X0–X73F
%IX0.0–
%IX73.15
Turn on or off based on external input.
External output
relays
1)
1184 Y0–Y73F
%QX0.0–
%QX73.15
Turn on or off external outputs based on
the operation result.
Internal relays
2)
4096 R0–R255F
%MX0.0–
%MX0.255.15
Used internally by the PLC program to
store bit information.
Link relays
2)
2048 L0–L127F
%MX7.0.0–
%MX7.63.15
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
176 R9000–R910F
%MX0.900.0–
%MX0.910.15
Turn on or off based on specific
conditions. Used internally as a flag.
Memory area [words]
Available address area
Type
Memory
size
FP IEC
Function
External input
relays
1)
74 WX0–WX73
%IW0–
%IW73
Code for specifying 16 external input
points as one word (16 bits) of data.
External output
relays
1)
74 WY0–WY73
%QW0–
%QW73
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)
32763 DT0–DT32762
%MW5.0–
%MW5.32762
Data memory used in a program. Data
is handled in 16-bit units (one word).
Link registers
2)
256 LD0–LD255
%MW8.0–
%MW8.255
Data memory shared by multiple PLCs
connected using PLC link. Data is
handled in 16-bit units (one word).
Timer/counter set
value area
2)
1024 SV0–SV1023
%MW3.0–
%MW3.1023
Data memory for storing the set values
of timers or counters. The values are
stored by timer/counter number.
Timer/counter
elapsed value area
2)
1024 EV0–EV1023
%MW4.0–
%MW4.1023
Data memory for storing the elapsed
values during operation of timers or
counters. The values are stored by
timer/counter number.
Special data
registers
260
DT90000–
DT90259
%MW5.90000–
%MW5.90259
Data memory for storing settings and
error codes.
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