描述
DCS惯常使用两层网络结构,一层为过程级网络,大部分DCS使用自己的总线协议,ABB的Profibus、ABB的CAN bus、施耐德的Modbus等,这些协议均建立在标准串口传输协议RS232或RS485协议的基础上。现场IO模块,特别是模拟量的采样数据(机器代码,213/扫描周期)十分庞大,同时现场干扰因素较多,因此应该采用数据吞吐量大、抗干扰能力强的网络标准。基于RS485串口异步通讯方式的总线结构,符合现场通讯的要求。
WATTS 2193-3 VALVE GLOBE ACV
8 Stanley 6ft Gold Series 120 Steel Framed Bypass Door
CONAIR TEMPRO MicroTRAC 23 Operator Panel Rev A Board
HAKKO 486 AIR CONTROL
2 Unloading Conveyor Gravity
FOXBORO 124-FE CONSOTROL AND SCANFOLD
SCHERR TUMICO 50-0135-07 DIAL BORE GAUGE
MARKEL AR500 .100X.124 Brown Flextech Liner 5400FT
COMPUTYPE GANTRY 12X32”
4 NNTM61008U2G AMPLIFIER
FOXBORO ICT AE003UZ BOARD
53 GRINNELL FIG 772 Rigid Coupling 1.5”
10 CENTRAL GRINNELL FIG 730 MECHANICAL TEE 2.5”
10 GRINNELL FIG 730 MECHANICAL TEE 3”/88.9MM
DALSA CL-E2-2048A-STDM Industrial Camera Advisor
Fluke 515A Portable Calibrator
BECKER VTC6/2 D71A4P VACUUM PUMP
BECKER VTC672-09 D71A4P VACUUM PUMP