8444-1067 WOODWARD Analog Output Module

Description

The Woodward MFR300 Series is an important product line to Woodward. In order to meet recent requirement of the market, Woodward will release a new version of the MFR300 by beginning next year. As the new MFR300 series comes with changes in hardware and software there will be new item numbers. The current item numbers will be discontinued and you will be offered a Last-Time-Buy.

The best evaluation standard for PLC programs is practice. See if the program can achieve the expected purpose. But that’s not enough. Because there are still good and bad programs that can achieve their goals. What kind of program is considered a good program? There are generally the following aspects:

1. Brevity
Keeping the PLC program as brief as possible is also a goal that should be pursued.
Short programs can save user storage space; In most cases, it can also save execution time, improve response speed to input, and improve program readability.
Whether a program is short or not can generally be measured by the number of instructions used in the program. If the number of instructions used is small, the program naturally becomes short.
To keep the program short, from a large perspective, it is necessary to optimize the program structure, simplify the program with process control instructions, and from a small perspective, replace single functional instructions with powerful instructions, and pay attention to the order of instructions.

2. Time saving
Program brevity can save program runtime, but brevity and time saving are not completely the same thing. Because the running time of a program is not only related to the number of instructions the program has, but also to what instructions are used. The execution time varies depending on the PLC instructions. Moreover, some instructions are executed at different times when the logical condition is ON and when it is OFF. Additionally, due to the use of process control instructions, not all instructions need to be executed in the program. So, calculating the time to run a program is relatively complex. But it is necessary to require that the average time is small and the maximum time is not too long. This can improve the response speed of the PLC.
The key to saving time is to use process control instructions well. Determine some instructions that must be executed according to the situation, make necessary parts, and the rest can be executed selectively according to the program, or design some time sharing work to avoid the maximum time being too long.

3. Readability
The designed program is required to have good readability. This not only facilitates programmers to deepen their understanding of the program and facilitate debugging, but also makes it easier for others to understand your program and for users to maintain it. If necessary, the program can also be promoted.
To make the program readable, the designed program should be as clear as possible. Pay attention to hierarchy, achieve modularity, and use object-oriented methods for design. Use more standard designs.
Furthermore, I/O allocation should be regular and easy to remember and understand. If necessary, some annotation work should also be done. The use of internal components should also be regulated and should not be used casually.
Readability should be noted at the beginning of program design. This is not easy to fully achieve. Due to the increase or decrease of instructions and changes in the use of internal devices during program debugging, the original clearer program may become somewhat chaotic. Therefore, there is a certain margin for debugging increase and decrease in design, and then do some sorting after debugging, so that the designed program has higher quality.

4. Correctness
The PLC program must be correct and verified through actual work to prove that it can work correctly. This is the most fundamental requirement for PLC programs, and if this cannot be achieved, no matter how good the rest is, it will be of no use.
To make the program correct, it is necessary to accurately use instructions and internal devices correctly. Accurately using instructions is related to accurately understanding them, so it is necessary to clarify the meaning and usage conditions of the instructions. If necessary, small programs can be compiled to test some unclear instructions.
For the same instruction, due to different factory batches of PLCs or different series and models of PLCs, some instruction details may vary. Therefore, it is necessary to carefully consult the programming manual.

8444-1066 MFR300-75M/WK0200 8444-1092 MFR300-75M
8444-1067 MFR300-75M/WK0300 N/A N/A
8444-1072 MFR300-11M/WK0200 8444-1089 MFR300-11M
8444-1076 MFR300-15M/WK0200 8444-1090 MFR300-15M
8444-1077 MFR300-71M/WK0200 8444-1091 MFR300-71M
8444-1078 MFR300-75M/WK0500 8444-1093 MFR300-75M/SU03
8444-1079 MFR300-75M/K28 8444-1094 MFR300-75M/K28
8444-1082 MFR300-71M/WK0600 8444-1095 MFR300-71M