In the STEP 7 programming environment, various types of addresses such as I/O signals, bit memory, counters, timers, data blocks, and function blocks are commonly used. These addresses are fully accessible within the program, but using symbolic names can significantly improve readability and maintainability (e.g., Motor_A_On or other symbols that follow a company or industry-specific naming convention). By assigning these symbolic names, you can reference the actual memory locations more efficiently in your code.
**Absolute Addressing**
An absolute address consists of an address identifier and a specific memory location, such as Q4.0, I1.1, M2.0, or FB21. These addresses directly point to a physical or logical location in the system and are essential for low-level control and direct access.
**Symbolic Addressing**
Using symbolic names instead of absolute addresses makes the program more intuitive and easier to understand. For instance, you can assign a symbol like MOTOR_ON to the absolute address Q4.0. This allows you to use MOTOR_ON throughout your code, making it much clearer which part of the system is being controlled.
STEP 7 automatically translates symbolic names into their corresponding absolute addresses during compilation. If you want to work with arrays, structures, data blocks, local data, logic blocks, or user-defined data types using symbolic names, you must first define the symbolic name for the corresponding absolute address. This ensures consistency and improves the overall structure of your program.
For example, by assigning the symbol MOTOR_ON to Q4.0, you can then use MOTOR_ON in your program statements. This not only enhances readability but also helps in aligning the program elements with the real-world components of your process control project. Symbolic addressing is especially useful in large-scale projects where clarity and maintainability are critical. It reduces errors and makes debugging and future modifications much simpler.
Tinned Copper Clad Aluminum TCCA
Copper Clad Aluminum Tinned Wire,Tinned Copper Clad Aluminum Audio Cable,Tinned Copper Clad Aluminum Alloy Wire ,Copper Clad Aluminum Tin Plating
changzhou yuzisenhan electronic co.,ltd , https://www.ccs-yzsh.com