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order from top to bottom, return to the top and execute again until the normally closed
conduction breaks off. The cycle stops when the last one finished.
M0
SBLOCK
Instruction 1
Instruction 2
Instruction 3
SBLOCKE
From up to down, run the instruction
one by one
Q21: What are the download modes of XD/XL series PLC and what are their
characteristics?
A21:
XD/XL series PLC has three download modes, which are:
Common download mode
In this mode, you can easily download the program from the computer to the PLC or upload
the program from the PLC to the computer. It will be very convenient to use this mode when
debugging the equipment.
Password Download Mode
You can set a password for the PLC. When you upload the program from the PLC to the
computer, you need to enter the correct password. In the advanced password option, you can
also check the function of "download the program needs to be decrypted first" (Note: This
operation is dangerous, if you forget the password, your PLC will be locked!). This download
mode is suitable for users when they need to keep the device program secret and they can call
out the device program at any time.
Secret download mode
In this mode, the program on the computer can be downloaded to the PLC, no matter what
way the user can upload the program in the PLC to the computer; at the same time, the user
program can be downloaded confidentially, which can occupy less internal resources of the
PLC, greatly increase the program capacity of the PLC, and can have a faster download
speed; after using this download mode, the program will be completely unable to recover.
Q22: What kinds of confidentiality methods do XD/XL series PLCs have?
A22:
Xinje PLC has three methods of confidentiality: (1) importing and exporting downloaded
files; (2) secret downloading; (3) password downloading.
Import and export download files: After saving the PLC program in this way, users can
download and use the program, but they can not view and edit the program.
Secret download: After secret downloading to PLC, the program and data in PLC will not be
uploaded, indicating that "the program does not exist".
from up to down, cyclic run the instruction
363
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