State Relay [S]; Numbers Of State Relays - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
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. FX /FX PLC
3U 3UC
Initial state type
S0 to S9
*1
10 points
2. FX PLCs
3G
Initial state type
(EEPROM keep)
S0 to S9
10 points
*1. This area is not latched (battery backed). It can be changed to a latched (battery backed) area by
setting the parameters.
*2. This area is latched (battery backed). It can be changed to a non-latched (non-battery-backed) area
by setting the parameters.
*3. The characteristics of latch (battery backup) cannot be changed in the parameters.
*4. 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.
94
Latched (battery
General type
S0 to S499
*1
500 points
Fixed latched Annunciator type
(EEPROM keep) type (EEPROM keep)
S10 to S899
890 points
Fixed latched (battery
backed) type backed) type
S500 to S899 S1000 to S4095
*2
400 points 3096 points
General type
S1000 to S4095
S900 to S999
100 points
3096 points
4 Devices in Detail
4.4 State Relay [S]
Annunciator type
S900 to S999
*3 *2
100 points
*4