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FX Series Programmable Controllers Devices in Detail 4
4-6
4.4 State Relays
Device Mnemonic:
S
Purpose:
Internal pro
g
rammable controller status fla
g
Alias:
State (coil/ rela
y
/ contact/ fla
g
)
S (coil/ rela
y
/ contact /fla
g
)
STL step (coil/ rela
y
/ contact /fla
g
)
Annunciator fla
g
Available forms:
NO (
) and NC contacts and output coils ( )
(see example device usa
g
e for references)
Devices numbered in:
Decimal, i.e. S0 to S9, S10 to S19
Further uses:
General stable state - state rela
y
s - see pa
g
e 4-6
Batter
y
backed/ latched state rela
y
s - see pa
g
e 4-7
STL step rela
y
s - see pa
g
e 4-8
Annunciator fla
g
s - see pa
g
e 4-9
Example device usage:
4.4.1 General Stable State - State Relays
A number of state rela
y
s are used in the PLC. The coils of these rela
y
s are driven b
y
device
contacts in the PLC in the same manner that the output rela
y
s are driven in the pro
g
ram.
All state rela
y
s have a number of electronic NO and NC contacts which can be used b
y
the
PLC as required. Note that these contacts cannot directl
y
drive an external load. Onl
y
output
rela
y
s can be used to do this.
X0
X1
1
S20
2
S20
Available devices:
• Please see the information point on pa
g
e 4-7 ‘Batter
y
backed/ latched state rela
y
s’,
or see the relevant tables for the selected PLC in chapter 8.