![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
The plc program structure of the Siemens S7-300/400 differs depending on the programming method used by the programmer. In general, programming can use linear programming, call programming, and structured programming (as shown).
With linear programming, all program instructions are written in a contiguous block, the organization block OB1, without the need to program blocks, function blocks, data blocks, and so on.
The program using call programming is composed of organization block OB, program block (FC), function block (FB), system program block (SFC), system function block (SFB), data block (DB), etc., organized by block OB1. Each logical block and data block are organized and managed.
The program structure form with structured programming is the same as the call programming. The program is also organized by the organization block OB, program block (FC), function block (FB), system program block (SFC), system function block (SFB), data block ( DB) and so on, and organize and manage it through the organization block OB1. The function block (FB) can be used for structured programming. In order to meet the needs of parameterized programming, the function block (FB) needs the matching instant data block DI. When the FB1 is called, it needs to be based on different control requirements. The data block DI assigns a parameter.
The figure shows the program structure diagram in three different programming modes. In the actual call programming and structured programming, the logic block called by the organization block OB1 can also call other logic blocks (program nesting).
Program structure and execution process of S7-300/400
The TPU materials type raw cable jacket can guarantee longer lifetime and quality. Coiled cable can be used to carry electrical currents as well as data and signal for telecommunications applications. This versatility makes coil cords ideal for use in environments that are often too rough for non-coiled cable.
It has the ability to extend beyond the natural length at rest, which can be a real space-saving feature. These cords are flexible beyond simple extending and retracting in that they can also be pulled, bent, and twisted without experiencing the metal fatigue of a straight cable.
Flex Coiled Cable Assembly, coiled cable harness, flex coiled wiring cable,High Quality Electrical Wire Harness,light-duty coiled cables
ETOP WIREHARNESS LIMITED , https://www.wireharness-assembling.com