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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.4 State Relay [S]
1
Introduction
2
Overview
3
Instruction
List
4
Devices
in Detail
5
Specified the
Device &
Constant
6
Before
Programming
7
Basic
Instruction
8
FNC00-FNC09
Program Flow
9
FNC10-FNC19
Move & Compare
10
FNC20-FNC29
Arith. & Logic
Operation
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. FX3U/FX3UC PLC
2. FX
3G PLCs
*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.
Initial state type General type
Latched (battery
backed) type
Fixed latched (battery
backed) type
Annunciator type
S0 to S9
10 points
*1
S0 to S499
500 points
*1
S500 to S899
400 points
*2
S1000 to S4095
3096 points
*3
S900 to S999
100 points
*2
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
*4