Toshiba T2N - Manual (Page 126)

2.INTERNAL OPERATIONS
User’s manual 113
A BCC (check code) correction is carried out immediately after rewriting
the content of the user program memory (adding / changing / inserting /
deleting) in RUN mode. This action is performed after completion of one
scan, so the scan cycle is extended while this is processed.
Changing the program on-line is subject to the following restrictions.
•
You can not change the number or running order of instructions which
are related to the program execution (see below).
END, MCS, MCR, JCS, JCR, JUMP, LBL, FOR, NEXT, CALL, SUBR,
RET, IRET
•
You can not change SFC structure in the SFC program section, but you
can change the action part corresponding to a step and a transitional
condition. (Ladder diagram part).
(10) Batch reading of program
The content of the user program memory (including the system
information) is read and sent to the peripherals.
It is used for the program uploading (T2N
→
Programmer
→
FD).
(11) Batch writing the program
The user program (including the system information) is received from the
peripherals and stored in the user program memory.
It is used for the program download (FD
→
programmer
→
T2N).
(12) Search
The instruction operand specified by the peripherals is extracted from the
user program memory and sent the address to the peripherals.
(13) Program check
When the program check command is received the user program syntax is
checked. The results of this check are sent to the peripherals.
(14) Reading data
The specified data is read from the user data memory in response to a
request from the peripherals, and sent to the peripherals.