Remote I/O
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Question: What is remote I/O? What is different about it compared to ordinary I/O modules?
Remote I/O enables on-site measurement, processing, and control of analog signals, with communication taking place via field buses.
Remote I/O refers to the method of setting up an I/O station specifically for points that are located at a considerable distance from the control unit, and then transmitting data to the control room via a bus or a dedicated network (such as network cables or optical fibers)
Remote I/O refers to communication modules combined with ordinary modules, such as Siemens’ IM153 series or Beckhoff’s terminal modules. I’m not sure whether connecting to a CPU or similar device that only collects data without processing it before sending it to the main CPU counts as remote I/O
Remote IO is in contrast to local expansion racks. It uses a bus to connect the input and output signals to the CPU, thereby enabling remote control of the input and output devices.
http://bbs.hcbbs.com/thread-381869-1-1.html also has detailed discussions
Remote I/O is essentially equivalent to a field control station, which then communicates with the control system in the central control room via optical cables
Remote IO refers to an IO chassis composed of separate cabinets, equipped with IO modules and communication modules. This chassis is connected to the control station of the control system via a communication bus. A large amount of control cables have been saved. However, both the protective and explosion-proof capabilities of this IO chassis must meet the requirements of harsh on-site environmental conditions; otherwise, it is difficult to install it there.
Remote I/O differs from centralized I/O: in centralized I/O, the controller and the I/O devices are combined together, while in remote I/O, the I/O devices and the controller are located separately. The I/O devices are situated on-site, where they collect signals via field buses and transmit them to the main station in the control room. Remote I/O is generally used in situations where the signal points are located far away from the control room but are relatively concentrated.