Mitsubishi MELSEC Q Series Programming Manual page 120

Setting device range in indexing
3-30
When performing the following access in Universal model QCPU or LCPU, an error
(error code: 4101) occurs.
1) Access crossing the boundary of devices caused by indexing
(range of A area)
The allocation order of individual devices is shown below:
SM
SD
X
Y
M
L
B
F
SB
V
S
Contact and coil of T
Contact and coil of ST
Contact and coil of C
Present value of T
Present value of ST
Present value of C
D
W
SW
Empty area
File register
(32K points)
2) Access crossing the boundary of file registers caused by indexing
3) Access to file registers (R, ZR) without setting file register files
4) Access to file registers (R, ZR) exceeded the range of file register files
Presetting PC parameter not to check indexing device range enables the Universal
model QCPU not to detect an error in the above accesses from 1) to 4).
Detecting an error in the above accesses from 1) to 4) , however, depends on the serial
No. of Universal model QCPU.
Set
Not set
*2: For changing the settings of the PLC parameter, refer to the QnUCPU User's Manual (Function
Explanation, Program Fundamentals) or Qn(H)/QnPH/QnPRHCPU User's Manual (Function
Explanation, Program Fundamentals).
When indexing is executed only with Universal model QCPU or LCPU, devices
between internal user devices (SW) and file registers (R) cannot be skipped.
(Error code: 4101).
Area A
Boundary B
*2
First 5 digits of serial No. for Universal model QCPU
Serial No."10021" or lower
Detected errors in accesses 1) to 4)
Detected errors in accesses 2) to 4)
Serial No."10022" or higer
Not detected