File Size - Mitsubishi Electric MELSEC-Q Series User Manual

6 FILES HANDLED BY BASIC MODEL QCPU

6.7.3 File size

Function
Drive header
Parameter
Sequence program
Device comment
File register
6 - 13
The file size differs with the types of files used. When a program memory, standard
RAM and standard ROM are used, calculate the size of a file with reference to the
table 6.7 shown below.
Space for file storage is available as shown below:
• Program memory, standard ROM: 4 bytes
Table 6.7 List of File Size
64
Default: 522 (increased by the parameter setting)
For Reference:
Boot setting to 70 + (18
With the MELSECNET/H setting to maximum 4096 / unit increased
With Ethernet setting to maximum 922 / unit increased
With CC-Link setting to maximum 251 / units increased
136 + (4 (Number of steps) )
74 + (Total of comment data size of each device)
• Comment data size of a device = 10 + 10250
• a: quotient of (Number of device points) / 256
• b: remainder of (Number of device points) / 256
2 (Number of file register points)
An example for calculating the amount of memory capacity required when writing the
parameter and sequence program in the program memory is shown below.
(1) Writing file
File name
parameter
sequence program
Represents the program capacity displayed with the GX Developer (total number of
file headers and created program steps.) (See Section 6.8.)
(2) Writing conditions
(a) Parameter: Default setting (522 bytes)
(3) File memory capacity calculations
File name
Parameter
Sequence
Sequence program capacity
program
File memory capacity total
A program memory capacity in units of 4 bytes (1 step) is secured.
Estimated File Size (in byte)
(Number of files) )
a + 40
Program capacity
—
5000 steps (20000 bytes)
File capacity
522 bytes
20,000 bytes 20,000 bytes
MELSEC-Q
b
Memory capacity
522 bytes
20,522 bytes
6 - 13