Mitsubishi Electric MELSEC-Q Structured Programming Manual page 22

FXCPU Structured Programming Manual
[Device & Common]
4. FX /FX /FX
1S 1N
Built-in device memory(RAM, EEPROM)
Contact image memory
Input relay (X)
Auxiliary relay (M) State relay (S)
Timer contact, time counting coil, reset coil (T),
counter contact, counting coil and reset coil (C)
Built-in program memory
(RAM, EEPROM)
Sequence program
File register (D)
The PLC automatically recognizes attachment of
an optional memory
and isolates the built-in program memory.
(The PLC gives the priority to the optional memory.)
*1. Optional memory cannot be connected to FX
20
/FX /FX PLCs
2N 1NC 2NC
CPU
[Bit device memory]
Output relay (Y)
Parameter
Comment
*1
(when the power is turned ON),
System ROM
[Data memory]
Data register (D)
Timer current value register (T)
Counter current value register (C)
Index register (V and Z)
Optional memory
(RAM,EEPROM,EPROM)
Sequence program
File register (D)
Clock function
(FX
2NC
Extension function
(FX
Clock function + Extension function
(FX
2NC
PLCs.
1NC
1 Device Outline
1.2 Program Memory and Devices
*1
Parameter
Comment
-EEPROM16C)
-ROM-E1)
2N
-ROM-CE1)