468
FX
3U
Series Programmable Controllers
User’s Manual - Hardware Edition
21 FX3U-FLROM-16/64/64L/1M (Memory Cassette)
21.6 Transfers By Display Module Operation
21.5.3 Reading (RD: 64L
<−
PLC)
Programs are read from the PLC’s internal RAM memory to the memory cassette.
Required condition: The PLC must be stopped, and the PROTECT switch must be OFF.
1
Turn the PROTECT switch OFF on the back of the memory cassette.
The memory cassette must be removed from the PLC in order to turn the PROTECT switch OFF.
Make sure that the PLC power is OFF before removing the memory cassette.
→
Refer to Subsection 21.2.2 for the removal procedure.
2
Install the memory cassette on the main unit.
→
Refer to Subsection 21.2.1 for the installation procedure.
• Verify that the PLC power is OFF, then install the memory
cassette on the PLC.
• Turn the PLC power ON.
• Raise the memory cassette’s eject lever.
3
Press the [RD] key 1 time.
The [RD] LED is lit, and a preparation status is established.
• To cancel, press the [WR] key.
4
Press the [RD] key again.
Reading is executed, and the [RD] LED blinks.
5
Remove the memory cassette from the main unit.
Reading is completed when the [RD] LED turns off.
After turning the PLC power OFF, remove the memory cas-
sette from the PLC, then turn the PROTECT switch ON.
→
Refer to Subsection 21.2.2 for the removal procedure.
21.6
Transfers By Display Module Operation
Programs can be transferred (reading/writing) between the memory cassette and the PLC’s internal RAM
memory by a display module operation.
→
Refer to Section 19.17 for the memory cassette transfer function.
21.7
Operation Precautions
Observe the following precautions when writing to file registers (D) and extended file registers (ER) by
program.
1. Flash memory writing count
10,000 writing operations are permitted at the flash memory.
2. Precaution for file register usage
Writing to the flash memory occurs at each PLC operation cycle if BMOV instructions are used in a
continuous execution format with regard to a file register.
To prevent this, be sure to use "pulse execution format" BMOVP instructions.
3. Precaution for extended file register (ER) usage
Do not use continuous constant-execution SAVER and LOGR instructions with regard to extended file
registers. Use the individual instructions only when required.
RUN
STOP
FX
3U
-48MR/ES
ERROR
RUN
BATT
POWER
0
3
1
2
IN
6
4
5
21
7
20
24
22
23
26
25
10
11
13
12
16
14
15
17
27
OUT
0
3
1
2
6
4
5
21
7
20
24
22
23
26
25
10
11
13
12
16
14
15
17
27
[RD] LED [RD] key
WR(64L
J
PLC)
RD(64L
I
PLC)
Summary of Contents for FX2-16E series
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Page 8: ... 6 Safety Precautions Read these precautions before use MEMO ...
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