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FX Series Programmable Controllers Devices in Detail 4
4-7
4.4.2 Battery Backed/ Latched State Relays
There are a number of batter
y
backed or latched rela
y
s whose status is retained in batter
y
backed or EEPROM memor
y
. If a power failure should occur all output and
g
eneral purpose
rela
y
s are switched off. When operation is resumed the previous status of these rela
y
s is
restored.
Available devices:
• For more information about device availabilit
y
for individual PLC’s, see chapter 8.
External loads:
• State rela
y
s are provided with countless number of NO contact points and NC contact
points, and are freel
y
available for use throu
g
h out a PLC pro
g
ram. These contacts
cannot be used to directl
y
drive external loads. All external loads should be driven
throu
g
h the use of direct (ex. Y) outputs.
PLC FX
0(S)
FX
0N
FX FX
(2C)
FX
2N(C)
General state relays
64
(S0 - 63)
N/A
500
(S0 - 499)
Battery backed/
latched relays
N/A
128
(S0 - 127)
500
(S500 - 999)
Total available
64 128 1000