Reading (Rd: 32L <- Plc); Operation Precautions - Mitsubishi Electric MELSEC-F FX3G Series User Manual

FX Series Programmable Controllers
3G
User's Manual - Hardware Edition
21.7.2 Reading (RD: 32L <- PLC)
Programs are read from the PLC's internal RAM memory to the memory cassette.
1
Install the memory cassette on the main unit.
• Verify that the PLC power is OFF, then install the memory
cassette on the PLC.
(Set the PROTECT switch to OFF.)
• Turn the PLC power ON.
• Raise the memory cassette's eject lever.
2
Press the [RD] key 1 time.
The [RD] LED lights, and a preparation status is established.
• To cancel, press the [WR] key.
3
Press the [RD] key again.
Reading is executed, and the [RD] LED blinks.
• It takes several seconds to read data from the built-in EEPROM. The RD LED flickers while data is read.
4
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 cassette from the PLC, then turn the
PROTECT switch ON.
21.8

Operation Precautions

1. Tapping screws provided for fixing the memory cassette
Two types of (longer and shorter) M3 tapping screws are packed together with the memory cassette.
Read carefully the installation method described in Section 21.3, and use the proper type.
2. Number of available units
Only one memory cassette may be connected to a FX
3. EEPROM memory writing count
10,000 writing operations are permitted at the EEPROM memory.
4. Precaution for file register (D) 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.
5. Precaution for extended file register (ER) usage
Do not use continuous constant-execution RWER instructions with regard to extended file registers.
Use the individual instructions only when required.
6. Loader function when the display module is used together
When the display module is used together, the loader function is enabled by performing the transfer
procedure in the display module.
Data is not transferred even if the transfer procedure is performed in the memory cassette.
For the data transfer procedure in the display module, refer to Chapter 20.
388
Required condition: The PLC must be stopped, and the PROTECT switch must be OFF.
→ Refer to Section 21.3 for the installation procedure.
→ Refer to Section 21.4 for the removal procedure.
main units.
3G
21 Memory Cassette
21.8 Operation Precautions
RD LED
RD key