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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.1 Device Number List
4. Devices in Detail
This chapter explains how numeric values are handled in the PLC as well as the roles and functions of various built-in
devices including I/O relays, auxiliary relays, state relays, counters and data registers.
The following content provides a basis for handling the PLC.
4.1 Device Number List
Device numbers are assigned as shown below.
For input relay numbers and output relay numbers when I/O extension equipment and special extension equipment
are connected to the PLC main unit, refer to the FX
3U Hardware Edition.
1) FX
3U/FX3UC PLC
Device name Description Reference
I/O relay
Input relay
X000 to X367
*1
248 points
Device numbers are octal.
The total number of inputs and outputs is 256.
Section 4.2
Output relay
Y000 to Y367
*1
248 points
Auxiliary relay
General type [variable]
M0 to M499 500 points
The setting can be changed between the latched
(battery backed) type and the non-latched type
using parameters.
Section 4.3
Latched (battery backed)
type [variable]
M500 to M1023 524 points
Latched (battery backed)
type [fixed]
M1024 to M7679
6656 points
Special type
*2
M8000 to M8511
512 points Chapter 37
State relay
Initial state (general type
[variable])
S0 to S9 10 points
The setting can be changed between the latched
(battery backed) type and the non-latched type
using parameters.
Section 4.4
General type [variable]
S10 to S499 490 points
Latched (battery backed)
type [variable]
S500 to S899 400 points
Annunciator
(latched (battery backed)
type [variable])
S900 to S999 100 points
Latched (battery backed)
type [fixed]
S1000 to S4095 3096 points
Timer (on-delay timer)
100 ms T0 to T191 192 points 0.1 to 3,276.7 sec
Section 4.5
100 ms [for subroutine or
interrupt routine]
T192 to T199 8 points 0.1 to 3,276.7 sec
10 ms T200 to T245 46 points 0.01 to 327.67 sec
Retentive type for 1 ms T246 to T249 4 points 0.001 to 32.767 sec
Retentive type for 100 ms T250 to T255 6 points 0.1 to 3,276.7 sec
1 ms T256 to T511 256 points 0.001 to 32.767 sec
Counter
General type up counter
(16 bits) [variable]
C0 to C99 100 points
Counts 0 to 32,767
The setting can be changed between the latched
(battery backed) type and the non-latched type
using parameters.
Section 4.6
Latched (battery backed)
type up counter
(16 bits) [variable]
C100 to C199 100 points
General type
bi-directional counter
(32 bits) [variable]
C200 to C219 20 points
−2,147,483,648 to
+2,147,483,647 counts
The setting can be changed between the latched
(battery backed) type and the non-latched type
using parameters.
Latched (battery backed)
type
bi-directional counter
(32 bits) [variable]
C220 to C234 15 points