Description
Overview
Essential details:RMP420 Remote I/O module KONGSBERG
Under normal circumstances, the power module is inserted in the first slot, the number is 0, the PLC is inserted in the second slot, and various types of input and output modules are inserted in the remaining slots. A printed circuit board with connectors is installed on the back of the I/O module rail to connect the slots for inserting the I/O module. The upper and lower parts of the slots allow the inserted modules to line up.
Rails with I/O modules and processors are called local I/O rails; A rail with an I/O module, power supply, remote I/O communication card and mounted away from the local I/O rail is called a remote I/O rail. The number of remote I/O rails depends on the number of variables that different processors can control.
The communication between the remote I/O guide rail and the processor can be achieved in a variety of ways, including coaxial cable, dual-axis cable, shielded twisted pair, etc., if the distance is far and the problem of noise interference needs to be considered, optical fiber communication can be used.
Parallel I/O modules:
The parallel I/O module assumes the important responsibility of information and data interaction with external systems, and can be used to expand peripheral devices, such as simple external devices such as direct action keyboards and leds.
Generally speaking, the 51 MCU has four 8-bit parallel I/O ports, respectively P0, PI, P2,P3 four groups, in which PO and P2 can be used as ordinary I/O ports can also be used as data address ports,P3 is used as ordinary I/O ports at the same time also has other (second) functions, only PI only instrument used as ordinary I/O ports.
Parallel I/O port PO to P3 support bit addressing operations, have a certain current 駆 dynamic ability, can drive some external devices, but because the PO is open leakage output structure, so as a common I/O pin need to add pull resistance.
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