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CHAPTER5 MEMORIES AND FILES USED FOR CPU MODULE
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5.1 Memories Used for CPU Module
5.1.1 Memory composition and storable data
(2) Data that can be stored in each memory
Tabl e5. 1 provides the data that can be stored in each memory.
: Required, : Storable, : Not storable
*1: A drive number is used to specify a memory to be written/read by the external device using a sequence program or MC protocol.
Since the memory name is used to specify the target memory by GX Developer, the drive number needs not to be considered.
*2: Store the intelligent function module parameters in the same drive with the parameters.
When they are stored in different drives, the intelligent function module parameters do not become valid.
*3: A program stored in the standard ROM cannot be executed.
Store the program to the program memory before execution.
*4: To execute a program stored in the memory card, make the setting in the Boot file tab of the PLC parameter dialog box.
*5: The device comments cannot be read by instructions in a sequence program.
*6: Reading from a sequence program requires several scans.
*7: Only each one of file register, one local device, and/or sampling trace file can be stored in the standard RAM.
*8: For the number of storable file register points, refer to Section 9.7.
*9: A sequence program allows reading only. No data can be written from the sequence program.
*10: Data can be written or read with the following instructions.
•SP.FREAD (batch-reads data from the specified file in the memory card.)
•SP.FWRITE (batch-writes data to the specified file in the memory card.)
*11: Set an area used by the system. ( Section 5.1.2(2)(b))
Table5.1 Data that can be stored in each memory
Item
CPU module built-in memory
Memory
card (
RAM)
Memory card (ROM)
File name and
extension
Remarks
Program
memory
Standard
RAM
Standard
ROM
SRAM card Flash card
ATA
card
Drive 0
*1
Drive 3
*1
Drive 4
*1
Drive 1
*1
Drive 2
*1
Parameter
PARAM.QPA 1 data/drive
Intelligent function
module parameter*
2
IPARAM.QPA 1 data/drive
Program
*3 *4 *4 *4
***.QPG -
Device comment
*5 *6 *6 *6 *6
***.QCD -
Initial device value
***.QDI -
Device data ***.QST -
File register
*7*8 *9
***.QDR -
Local device
*7
***.QDL
1 data/CPU
module
Sampling trace file
*7
***.QTD -
Error history data ***.QFD -
Device data storage file
DEVSTORE.
QST
-
Module error collection file IERRLOG.QIE -
Backup data file
MEMBKUP0.
QBP
-
Programmable controller
user data
*10
***.*** -
User setting system area
*11
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