Common Data Blocks in PLC Programming: Background Data Blocks, User Data Types, and System Data Types
Background Data Block The backgroundDB block is associated withFB blocks. When creating a backgroundDB block, it is necessary to specify theFB block it belongs to, and thatFB block must already exist, as shown in Figure1. When calling anFB block, you can either assign it an already created backgroundDB block (for example, data block_1), or directly … Read more