橫河EJA440A高壓力變送器，橫河變送器選型，橫河EJA440A高壓力變送器，橫河變送器選型

Modbus協(xié)議最初由Modicon公司開發(fā)出來在1979年末該公司成為施耐德自動(dòng)化(Schneider Automation)部門的一部分現(xiàn)在Modbus已經(jīng)是工業(yè)領(lǐng)域全球最流行的協(xié)議。此協(xié)議支持傳統(tǒng)的RS-232、RS-422、RS-485和以太網(wǎng)設(shè)備。許多工業(yè)設(shè)備包括PLCDCS智能儀表等都在使用Modbus協(xié)議作為他們之間的通訊標(biāo)準(zhǔn)。有了它不同廠商生產(chǎn)的控制設(shè)備可以連成工業(yè)網(wǎng)絡(luò)進(jìn)行集中監(jiān)控。 $ f- e( {0 l( l9 n, ~. l7 C, L 當(dāng)在網(wǎng)絡(luò)上通信時(shí)Modbus協(xié)議決定了每個(gè)控制器須要知道它們的設(shè)備地址識(shí)別按地址發(fā)來的消息決定要產(chǎn)生何種行動(dòng)。如果需要回應(yīng)控制器將生成應(yīng)答并使用Modbus協(xié)議發(fā)送給詢問方。 4 L' H8 C6 Q8 j* L( p# C* e8 W: \ Modbus協(xié)議包括ASCII、RTU、TCP等并沒有規(guī)定物理層。此協(xié)議定義了控制器能夠認(rèn)識(shí)和使用的消息結(jié)構(gòu)而不管它們是經(jīng)過何種網(wǎng)絡(luò)進(jìn)行通信的。標(biāo)準(zhǔn)的Modicon控制器使用RS232C實(shí)現(xiàn)串行的Modbus。Modbus的ASCII、RTU協(xié)議規(guī)定了消息、數(shù)據(jù)的結(jié)構(gòu)、命令和就答的方式數(shù)據(jù)通訊采用Maser/Slave方式Master端發(fā)出數(shù)據(jù)請(qǐng)求消息Slave端接收到正確消息后就可以發(fā)送數(shù)據(jù)到Master端以響應(yīng)請(qǐng)求Master端也可以直接發(fā)消息修改Slave端的數(shù)據(jù)實(shí)現(xiàn)雙向讀寫。

橫河EJA440A高壓力變送器武漢變送器

EJA440系列高靜壓壓力變送器
EJA440A-DCS4A-97DA EJA440A-ECS4A-97DA EJA440A-DDS4A-97DA EJA440A-EDS4A-97DA
EJA440A-DCS4A-97DN EJA440A-ECS4A-97DN EJA440A-DDS4A-97DN EJA440A-EDS4A-97DN
EJA440A-DCS4A-97NA EJA440A-ECS4A-97NA EJA440A-DDS4A-97NA EJA440A-EDS4A-97NA
EJA440A-DCS4A-97NN EJA440A-ECS4A-97NN EJA440A-DDS4A-97NN EJA440A-EDS4A-97NN
EJA440A-DCS4A-92DA EJA440A-ECS4A-92DA EJA440A-DDS4A-92DA EJA440A-EDS4A-92DA

EJA440A-DCS5A-97NN EJA440A-ECS5A-97NN EJA440A-DDS5A-97NN EJA440A-EDS5A-97NN
EJA440A-DCS5A-92DA EJA440A-ECS5A-92DA EJA440A-DDS5A-92DA EJA440A-EDS5A-92DA
EJA440A-DCS5A-92DN EJA440A-ECS5A-92DN EJA440A-DDS5A-92DN EJA440A-EDS5A-92DN
EJA440A-DCS5A-92NA EJA440A-ECS5A-92NA EJA440A-DDS5A-92NA EJA440A-EDS5A-92NA
EJA440A-DCS5A-92NN EJA440A-DCS4A-92DN EJA440A-ECS4A-92DN EJA440A-DDS4A-92DN  
EJA440A-DCS4A-92NA EJA440A-ECS4A-92NA EJA440A-DDS4A-92NA EJA440A-EDS4A-92NA
EJA440A-DCS4A-92NN EJA440A-ECS4A-92NN EJA440A-DDS4A-92NN EJA440A-EDS4A-92NN
EJA440A-DCS4A-22DC EJA440A-ECS4A-22DC EJA440A-DDS4A-22DC EJA440A-EDS4A-22DC
EJA440A-DCS4A-22DN EJA440A-ECS4A-22DN EJA440A-DDS4A-22DN EJA440A-EDS4A-22DN
EJA440A-DCS4A-22NA EJA440A-ECS4A-22NA EJA440A-DDS4A-22NA EJA440A-EDS4A-22NA
EJA440A-DCS4A-22NN EJA440A-ECS4A-22NN EJA440A-DDS4A-22NN EJA440A-EDS4A-22NN
EJA440A-DCS5A-97DA EJA440A-ECS5A-97DA EJA440A-DDS5A-97DA EJA440A-EDS5A-97DA
EJA440A-DCS5A-97DN EJA440A-ECS5A-97DN EJA440A-DDS5A-97DN EJA440A-EDS5A-97DN
EJA440A-DCS5A-97NA EJA440A-ECS5A-97NA EJA440A-DDS5A-97NA EJA440A-EDS5A-97NA
EJA440A-ECS5A-92NN EJA440A-DDS5A-92NN EJA440A-EDS5A-92NN EJA440A-EDS4A-92DN
EJA440A-DCS5A-22DC EJA440A-ECS5A-22DC EJA440A-DDS5A-22DC EJA440A-EDS5A-22DC
EJA440A-DCS5A-22DN EJA440A-ECS5A-22DN EJA440A-DDS5A-22DN EJA440A-EDS5A-22DN
EJA440A-DCS5A-22NA EJA440A-ECS5A-22NA EJA440A-DDS5A-22NA EJA440A-EDS5A-22NA
EJA440A-DCS5A-22NN EJA440A-ECS5A-22NN EJA440A-DDS5A-22NN EJA440A-EDS5A-22NN
EJA440A-DCS4A-97DA/NF1 EJA440A-ECS4A-97DA/NF1 EJA440A-DDS4A-97DA/NF1
EJA440A-EDS4A-97DA/NF1 EJA440A-DCS4A-97DN/NF1 EJA440A-ECS4A-97DN/NF1
EJA440A-DDS4A-97DN/NF1 EJA440A-EDS4A-97DN/NF1 EJA440A-DCS4A-97NA/NF1
EJA440A-ECS4A-97NA/NF1 EJA440A-DDS4A-97NA/NF1 EJA440A-EDS4A-97NA/NF1
EJA440A-DCS4A-97NN/NF1 EJA440A-ECS4A-97NN/NF1 EJA440A-DDS4A-97NN/NF1