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.