Program Memory And Devices; Memory Structure - Mitsubishi Electric FX3G SERIES Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2.6

Program Memory and Devices

2.6.1

Memory structure

1. In FX /FX PLCs
3U 3UC
FX /FX PLCs are equipped with the RAM memory as standard.
3U 3UC
By mounting a memory cassette, the memory type can be changed.
1) When using the built-in memory (without attached memory cassette)
Built-in device memory (RAM)
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
(RAM)
Parameter
Sequence program
Comment
File register (D)
Special setting
Symbolic information
*1. Supported in Ver. 3.00 or later.
CPU
[Bit device memory]
• Output relay (Y)
*1
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
(Flash memory)
Not attached
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