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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.4 State Relay [S]
4.4 State Relay [S]
State relays (S) are important devices to program stepping type process control simply, and combined with the step
ladder instruction STL.
State relays can be used in the SFC (sequential function chart) programming method.
→ For programming by the step ladder instruction and SFC method, refer to Chapter 35.
4.4.1 Numbers of state relays
The table below shows state relay (S) numbers. (Numbers are assigned in decimal.)
1. FX3S PLC
2. FX
3G/FX3GC PLCs
3. FX
3U/FX3UC PLCs
*1. These registers can be changed to the latched (battery backed) type by the parameter setting when the
optional battery is used. However, the latched range cannot be set.
*2. This area is not latched (battery backed). It can be changed to a latched (battery backed) area by setting the
parameters.
*3. This area is latched (battery backed). It can be changed to a non-latched (non-battery-backed) area by setting
the parameters.
*4. The characteristics of latch (battery backup) cannot be changed in the parameters.
Initial state type
(EEPROM keep)
Fixed latched
(EEPROM keep) type
General type
S0 to S9
10 points
S10 to S127
118 points
S128 to S255
128 points
Initial state type
(EEPROM keep)
Fixed latched
(EEPROM keep) type
Annunciator type
(EEPROM keep)
General type
S0 to S9
10 points
S10 to S899
890 points
S900 to S999
100 points
S1000 to S4095
3096 points
*1
Initial state type General type
Latched
(battery backed) type
Fixed latched
(battery backed) type
Annunciator type
S0 to S9
10 points
*2
S0 to S499
500 points
*2
S500 to S899
400 points
*3
S1000 to S4095
3096 points
*4
S900 to S999
100 points
*3