The communication between PLC and PLC Settings - way

the communication between PLC and PLC or more, have different Settings of each communication way, today and you chat with two units FX2N PLC controller through the RS485 communication module is connected into a N: N type communication network structure. Below we talk about how to set this way of communication.

we know N: N small network in the industrial field multitasking complex control, PLC in the network ACTS as a different 'character', and 'task' to complete their respective control, through the communication between them connect with each other, communicate with each other to complete the joint control of 'character'.

to complete the N: N communication, the first thing we should have FX2N - on hardware 485 - BD module, and then to install on the PLC basic unit. After a module with a 2 core shielded twisted-pair cable to host and SDA and RDA signal from machine terminal connected with a thread; Then the host and from machine SDB and RDB signal lines connected; Finally connect the SG signal wire terminals, thus two hardware of PLC controller communication even if completing, attachment is simple.

the following task is to set the parameters in the PLC controller and programming, here is mainly to the writing of the program, program is primarily the main control program and control program from the stand, the reference program below.

this is the main control program

at this moment from station control program

in master-slave PLC program we set the parameters of the host generally has five, respectively is the number of sites D8176 registers, from total station D8177 range, refresh D8178 registers, the above three belongs to 'only' features; Behind the two belong to 'read' is the characteristic of retries D8179 and communication timeout D8180 registers. Then the data exchange between PLC is through the special area of soft component and word soft elements to complete. For communications, each station gives 64 internal relay components and eight data register components. For each station, it will only transfer within the prescribed scope of content into their own, can also from other station data and a 'demand'. This parameter is set is completed.

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