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7 Before Programming
7.1 File format available in the CF-ADP
39
FX3U-CF-ADP User's Manual
1
Introduction
2
Specification
3
System
Configuration
4
Installation
5
Wiring
6
Functions
7
Before
Programming
8
CF-ADP Applied
Instructions
Explanation
9
Program
Examples
10
Troubleshooting
7.1.5 Data writing destination
Data can be written to two destinations, the CompactFlash
TM
card and the internal buffer inside the CF-ADP.
1. When data is written to the CompactFlash
TM
card
When the CompactFlash
TM
card is specified as the writing destination in the applied instruction for the CF-
ADP, data is directly written to the CompactFlash
TM
card.
Because data is written to the CompactFlash
TM
card every time the instruction is executed, the user should
pay attention to the number of times data is written to the CompactFlash
TM
card.
For example, if data is written to the CompactFlash
TM
card every minute, data is written 100,000 times in
approximately 2 months.
Even if the power is turned OFF after data is written normally, the written data is not cleared.
2. When data is written to the internal buffer inside the CF-ADP
When the Internal buffer inside the CF-ADP is specified as the writing destination in the applied instruction for
the CF-ADP, data is written to the internal buffer inside the CF-ADP. This type of writing is not counted as a
data write to the CompactFlash
TM
card. Data writing from the buffer inside the CF-ADP to the
CompactFlash
TM
card is counted as a data write to the CompactFlash
TM
card. However, attention is required
because data is cleared in the following cases.
Data is cleared at the following times, and data is written from the internal buffer inside the CF-ADP to the
CompactFlash
TM
card at the following times.
Times when the internal buffer inside the CF-ADP is cleared
- When the file deletion command or file formatting command is executed
- When the CompactFlash
TM
card is pulled out
- When the power is turned OFF using any procedure other than the specified power OFF procedure
Times when data is written from the internal buffer inside the CF-ADP to the CompactFlash
TM
card
- When data to be buffered exceeds the capacity of the internal buffer inside the CF-ADP
- When the buffer force write command is executed
- When data writing is executed for a buffered file ID with the CompactFlash
TM
card specified as the
writing destination
- When the CF card ACCESS switch is set from ON to OFF
- When an applied instruction to unmount the CompactFlash
TM
card is executed
- When the Index is returned to the head among buffered data (ring buffer)
Or when data writing is executed for the specified maximum number of lines if "Stops execution" is
selected as the processing to be executed when the maximum number of lines specified during file
creation is reached
- When the overwrite applied instruction is executed while data is buffered
Main unit
CF-ADP
1)
CompactFlash
TM
card
Sequence
program
2)
Internal buffer
inside CF-ADP
Writing
destination
Writing
destination