Mitsubishi Electric FX3G SERIES Programming Manual page 37

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2. In FX PLCs
3G
FX PLCs are equipped with the EEPROM memory as standard.
3G
1) When using the built-in memory (without attached memory cassette)
Built-in device memory (RAM, EEPROM)
Contact image memory
• Input relay (X)
• Auxiliary relay (M) • State relay (S)
Timer contact and time counting coil
Counter contact, counting coil, and reset coil
Built-in program memory
(EEPROM)
Parameter
Sequence program
Comment
File register (D)
Special setting
Extension file register (ER)
2) When using an attached memory cassette (without using the built-in program memory)
Built-in device memory (RAM, EEPROM)
Contact image memory
• Input relay (X)
• Auxiliary relay (M) • State relay (S)
Timer contact and time counting coil
Counter contact, counting coil, and reset coil
Built-in program memory
(EEPROM)
Not used
The PLC automatically recognizes attachment of a
memory cassette (when the power is turned ON),
and disconnects the built-on program memory.
(The priority is given to the memory cassette.)
CPU
[Bit device memory]
• Output relay (Y)
CPU
[Bit device memory]
• Output relay (Y)
2 Overview (Sequence Program)
2.6 Program Memory and Devices
System ROM
[Data memory]
• Data register (D)
• Timer present value register (T)
• Counter present value register (C)
• Index register (V, Z)
• Extension register (R)
Memory cassette
(EEPROM)
Not attached
System ROM
[Data memory]
• Data register (D)
• Timer present value register (T)
• Counter present value register (C)
• Index register (V, Z)
• Extension register (R)
Memory cassette
(EEPROM)
Parameter
Sequence program
Comment
File register (D)
Special setting
Extension file register (ER)
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