Справочник Пользователя для Mitsubishi Electronics FX2NC
FX Series Programmable Controllers
Devices in Detail 4
4-36
4.12.4
File Registers
File registers are available in two forms:
-
Program memory registers - these occupy program steps in blocks of 500 and are avail-
able on FX
able on FX
0N
, FX, FX
2C
and FX
2N(C)
products
-
RAM registers - these occupy a special data area and are available on all FX
2C
units and
FX units with CPU version 3.07 or greater.
Program memory registers
File registers can be secured in the program memory (RAM, EEPROM or EPROM) in units of
500 points. These registers can be accessed with a peripheral device. While the PLC is
operating, data in the file registers can be read to the general-use/ battery backed/ latched
registers by using the BMOV instruction.
File registers are actually setup in the parameter area of the PLC. For every block of 500 file
registers allocated and equivalent block of 500 program steps are lost.
500 points. These registers can be accessed with a peripheral device. While the PLC is
operating, data in the file registers can be read to the general-use/ battery backed/ latched
registers by using the BMOV instruction.
File registers are actually setup in the parameter area of the PLC. For every block of 500 file
registers allocated and equivalent block of 500 program steps are lost.
Note: The device range for file registers in the FX
2N(C)
overlaps with the latched data registers.
The allocation of these devices as file registers ensures that the data is kept with the program.
Writing to file registers:
•
FX
0N
and FX file register data can only be changed by a peripheral device such as a
hand held programmer or a personal computer running the appropriate software.
For details of how to carry out the changes please reference the relevant operation
manual for guidance.
For details of how to carry out the changes please reference the relevant operation
manual for guidance.
•
FX
(2C)
and FX
2N(C)
file register data can also be changed by the program using the
BMOV instruction.
•
Only file registers in RAM or internal memory can be changed during RUN, but both
RAM, internal and EEPROM memory cassette memories can be changed when the PLC
is in STOP mode.
RAM, internal and EEPROM memory cassette memories can be changed when the PLC
is in STOP mode.
Special caution when using FX
0N
:
•
No file registers can be modified during RUN.
Special caution when using FX:
•
While the FX PLC is in RUN mode, alteration of the file registers D1000 to D1119 (120
points) is not allowed. Attempts to change these devices during RUN may result in a pro-
gram error when the PLC is next switched into RUN.
points) is not allowed. Attempts to change these devices during RUN may result in a pro-
gram error when the PLC is next switched into RUN.
RAM registers
RAM file registers are 2000 points which can be activated by driving a special auxiliary relay
M8074 ON. These registers can then be accessed just like normal program file registers. RAM
registers occupy no program steps but do occupy the sampling trace data register area when
M8074 is active.
M8074 ON. These registers can then be accessed just like normal program file registers. RAM
registers occupy no program steps but do occupy the sampling trace data register area when
M8074 is active.
Available devices:
•
Please refer to the table on page 4-33 or chapters 6 and 8, where further details of the
availability of devices can be found.
availability of devices can be found.
FX
0(S)
FX
0N
FX FX
(2C)
FX
2N(C)
FX
0(S)
FX
0N
FX FX
(2C)
FX
2N(C)