IDEC FT1A Series User Manual page 144

5: S F
PECIAL UNCTIONS
SD Memory Card Status LED and SD Memory Card Status
The status LED turns on or flashes when the SD memory card is being formatted or during reading and writing.
SD memory card
status LED
On
Slow flashing
(1 second interval)
Quick flashing
(100 millisecond interval)
Off
Special Internal Relays for the SD Memory Card
The special internal relays (M8026 and M8027) turn on and off according to the installation status and the access state of the SD
memory card. Access to the SD memory card can be stopped by special internal relay M8076.
Address
M8026 SD Memory Card Status
M8027 SD Memory Card Writing Flag
M8076 SD Memory Card Access Stop Flag
Note: R/W is the abbreviation for read/write. R/W indicates that the relay can be read and written. R indicates that the relay can only be read. W
indicates that the relay can only be written.
Timing Chart
The special internal relays turn on and off according to the installation status and the access state of the SD memory card as
shown below.
SD memory card inserted
SD memory card access state
SD memory card
access stop flag M8076
SD memory card
status M8026
SD memory card
writing flag M8027
SD memory card
status LED
5-56
The standby state where the SD memory card can be written or read
While the SmartAXIS is recognizing the SD memory card
•
While the SmartAXIS is stopping the access due to SD memory card access stop
•
flag (M8076) turning on (slow flashing, then off)
Reading from or writing to the SD memory card
When an SD memory card is not inserted
•
When an unsupported or unformatted SD memory card is inserted
•
When access to the SD memory card is stopped by SD memory card access stop
•
flag (M8076)
When the SmartAXIS is turned off
•
Function
This special internal relay turns on when the SD memory card has
been inserted into the SmartAXIS, the card has been recognized,
and the card is in a usable state. This special internal relay turns
off when the SD memory card is not inserted or when the SD
memory card is not recognized.
This special internal relay turns on when the SD memory card is
being accessed.
This special internal relay turns off when the access has finished.
When this special internal relay changes from off to on, access to
the SD memory card is stopped. Once the access to the SD
memory card is stopped, insert the card into the SmartAXIS again
to make it accessible.
Not
inserted Inserted
Standby state
Card being
recognized
ON
OFF
ON
OFF
ON
OFF
ON
Slow
flashing
OFF
S AXIS P /L
MART RO
SD memory card state
Description
Standby state
Reading /
Writing
Quick
On
flashing
U ' M FT9Y-B1378
ITE SER S ANUAL
Operation
The SD memory card
can be removed.
Do not remove the SD
memory card.
The SD memory card
can be removed.
Stop access
Access
stopping
Slow
On
flashing
Read/Write
R
R/W