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1 Programming Summary
XD/XL series PLC accept the signal and execute the program in the controller, to fulfill the
requirements of the users. This chapter introduces the PLC features, two kinds of
programming language and etc.
1-1 PLC Features
XD/XL series PLC support two kinds of program language, instruction and ladder chart, the
two kinds of language can convert to each other.
To avoid the stolen or wrong modifying of user program, we encrypt the program. When
uploading the encrypted program, it will check in the form of password. This can protect the
user copyright; meanwhile, it limits the downloading, to avoid change program by mistake.
XD/XL series added new register FS. (For different XD/XL models, please check the Data
monitor in XDPpro software for FS register range, common range is FS0~FS47). FS value
can be modified but cannot be read through Modbus instruction. FS cannot be compared to
register but only constant in XDPpro software. The value cannot be read. FS is used to protect
the user’s copyright. The register D, HD… can replace by FS.
When the user program is too long, the comments of program and soft components are
necessary in order to change the program easily later.
Add offset appendix (like X3[D100], M10[D100], D0[D100]) after coils, data registers can
make indirect addressing. For example, when D100=9, X3[D100]=X[3+9]=X14;
M10[D100]=M19, D0[D100]=D9
XD/XL series PLC has enough basic instructions including basic sequential control, data
moving and comparing, arithmetic operation, logic control, data loop and shift etc.
XD/XL series PLC also support interruption, high speed pulse, frequency testing, precise time,
PID control and so on.
XD/XL series PLC support C language; users can call the C program in ladder chart. This
function improves the programming efficiency.
C Language Function Block
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