Internal module connecting bus for site controlling computer and its realization method
A field control and communication technology, applied in the direction of instrumentation, electrical digital data processing, etc., can solve the problems of complex communication software, excessive communication program overhead, etc., and achieve the effects of convenient use, low manufacturing and use costs, and high reliability
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[0018] Such as figure 1 As shown, this embodiment takes the connection of four control modules as an example. Modules A to D are control modules in the field control machine, and each control module has software and hardware to complete corresponding tasks. The equipment communicating with the internal modules of the field control machine is composed of a hub 1, a logical operation circuit 2 and a full-duplex bus 4, and the full-duplex bus 4 is an RS422 full-duplex bus.
[0019] The hub 1 is connected to the modules A-D through a full-duplex bus 4 . The logic operation circuit 2 is formed by connecting the "NAND" gate circuit IC25 and the "NAND" gate circuit IC26 in series, and the four input ends of the "NAND" gate circuit IC25 are respectively connected with the four RS422 receivers IC3 and IC7 of the hub 1. , IC11T and IC15 are connected. The output of the "NOT" gate circuit IC26 is connected to the RS422 transmitters IC4, IC8, IC12 and IC16 of the hub 1 through a bus 3 ...
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