Reading (Rd: 64L <- Plc); Transfers By Display Module Operation; Operation Precautions - Mitsubishi FX3U SERIES User Manual

FX Series Programmable Controllers
3U
User's Manual - Hardware Edition
21.5.3 Reading (RD: 64L <− PLC)
Programs are read from the PLC's internal RAM memory to the memory cassette.
1
Turn the PROTECT switch OFF at the rear face of the memory cassette.
The memory cassette must be removed from the PLC in order to turn the PROTECT switch OFF.
2
Install the memory cassette on the main unit.
• 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 lights, 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 goes 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.
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.
436
Required condition: The PLC must be stopped, and the PROTECT switch must be OFF.
→ Refer to Subsection 21.2.1 for the installation procedure.
→ Refer to Section 19.17 for the memory cassette transfer function.
21 FX3U-FLROM-16/64/64L (Memory Cassette)
21.6 Transfers By Display Module Operation
→ Refer to Subsection 21.2.2 for the removal procedure.
[RD] LED [RD] key
WR(64L PLC)
RD(64L PLC)