The Easier Programming, the Better Project

1. Chapter 1
The Easier Programming, the Better Project
Even though every software engineers in automation field are familiar to
software programming of PLC and HMI, there are some unexpected situation
happens during operation. For example, instructions, formulas, parameters we
programmed are all correct, there not exist external interference, and wiring and
switch is normal, but the equipment does not work well, that is because of
programming bug. It requires a certain step in accordance with the preparation of a
reasonable operating mechanism to quantify the process of programming, which
improves the flexible of programming and decreases bugs to make equipment runs
well.
SETP_Ⅰ、I/O Allocation------Logical allocation of I/O is the basic of programming
★Allocate the same function of Input and output together, as below picture showed:

2. It is good for programming, convenient to search and easy for wiring.
★X0、X1、Y0、Y1 can be reserved, if enough, for high speed counting and pulse
output.
★As for emergency stop button, stop button, forward, back, rise,up, external switch
is recommended for closed contacts and open contacts in programming. As a result
that the equipment will not cause damage because of switch problem.
★The selection of Analog: current type is preferred. The on-site practicing proves
that anti-jamming capability of current is almost 80% higher than Voltage.
★If possible, select analog type to control the third party device, because the analog
response speed is much greater than the communication response speed.