Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 174

(1) Availability
(a) For the Q00UJCPU, Q00UCPU, and Q01UCPU
The function cannot be performed in the following cases.
• A program memory does not have enough area for storing a program file to be written.
• A program memory stores the maximum number of files that can be stored.
(b) For the Q02UCPU, QnUD(H)CPU, and Built-in Ethernet port QCPU
Files can be written in the RUN status, regardless of free space in the program memory and the number of files
to be stored.
(2) Increase in the scan time
The scan time increases when a program file is written to the CPU module in the RUN status.
For increase in the scan time, refer to Page 486, Appendix 3.3 (7).
(3) Online change (files) from multiple locations
Do not simultaneously write files to one CPU module in the RUN status from multiple locations.
Doing so may delete program files.
(4) Online change (files) of SFC programs
SFC programs cannot be written in units of files to the CPU module in the RUN status.
(5) Operations prohibited when programs are written to the CPU module in the
RUN status, TC setting value is changed, or data are transferred from a
program cache memory to a program memory
Refer to Page 173, Section 3.12.3 (2).
(6) Instructions that do not operate normally when files are written to the CPU
module in the RUN status
Refer to Page 174, Section 3.12.3 (3).
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