Battery Backed/ Latched State Relays - Mitsubishi FX1S Series Programming Manual

FX Series Programmable Controllers
4.4.2

Battery Backed/ Latched State Relays

There are a number of battery backed or latched relays whose status is retained in battery
backed or EEPROM memory. If a power failure should occur all output and general purpose
relays are switched off. When operation is resumed the previous status of these relays is
restored.
Available devices:
PLC
General state
relays
Battery backed/
latched relays
Total available
• For more information about device availability for individual PLC's, see chapter 8.
External loads:
• State relays are provided with countless number of NO contact points and NC contact
points, and are freely available for use through out a PLC program. These contacts
cannot be used to directly drive external loads. All external loads should be driven
through the use of direct (ex. Y) outputs.
FX FX
1S 1N
N/A N/A
128 1000
(S0 - 127) (S0 - 999)
128 1000
Devices in Detail 4
FX FX
2N 2NC
500
(S0 - 499)
500
(S500 - 999)
1000
4-7