![]() Here, the I/O modules act as translators between different field devices and the PLC to ensure that the PLC and the field devices always get the information in the right format. ![]() Discrete-type I/O devices have only two states - on and off - but analog-type I/O devices have an infinite number of states i.e., a variety of complex signals. Inputs are devices that supply a signal/data to a PLC, while outputs await a signal/data from the PLC to perform their assigned tasks. Note that in some small PLCs, these I/O modules and the rack come pre-built as a single unit. The I/O modules have connection terminals to which the field devices are wired, and the rack is an enclosure with slots in it that is interfaced with the CPU. ![]() All of the field devices are wired to the input/output (I/O) system of the PLC, which consists of two key parts - the I/O modules and the rack. As is the case with every computing system, the brain of the PLC is the central processing unit (CPU), which consists of the processor, memory system, and power supply.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |