Buffer Memories; Configuration Of The Buffer Memories - Mitsubishi FX2N-10GM Hardware / Programming Manual

FX Series Positioning Controllers
7.2

Buffer Memories

7.2.1

Configuration of the buffer memories

The buffer memories correspond to the device memories such as parameters, various special
Ms and various special Ds as shown in the configuration diagram on the previous page. (For
details, refer to Section 6.)
• The buffer memory No. is indicated as "#". One point consists of 16-bit data.
• Bit devices such as auxiliary relays, I/O relays, etc.in the positioning unit and word devices
such as data registers, parameters, etc. are assigned to 16-bit data in the buffer memories.
• Each bit of the buffer memories to which bit devices are assigned operates differently.
Example: BFM#20
#20
The figure above shows the buffer memory #20. The special auxiliary relays M9000 to
M9015 are assigned to #20. For example, M9001 (X axis start command) is assigned to Bit
1 of #20. When a sequence program is created so that this bit is turned ON by the TO
instruction (writing to the buffer memories), the start command is given.
• The buffer memory to which a word device is assigned expresses a single value in 16 bits or
32 bits.
Example: BFM#9000
D9000 is assigned to the buffer memory #9000.
By wiring data to #9000 using the TO instruction, you can specify the program No.
As to word devices, the buffer memory No. is equivalent to the special data register No.
b15 b14
M9015 M9014
Continuous 16-bit
path mode command
#9000
D9000: Program No. specification.
Communication with Programmable Controller 7
Not defined in the FX
2N
Intermediate bits are omitted in description.
b2 b1
M9002 M9001
Stop Start
command command
16-bit data (binary)
-10GM.
b0
M9000
Single-step
command
7-2