在这一级上,从安全性考虑,管理计算机不能 直接干预装卸控制系统。现场层可采用一主站三从站的方式,以系列 90 -30 PLC 程控器通过Fieldbus(现场总线)或者 RIO net(远程输入 / 输出)主从式网络,把三个远程站(从站)与本地站(主 站)联接起来,构成对现场设备的基本控制。主站负责 整个输煤系统的控制及各分站的调度、通信等,也处理适 当的I/O系统。各分站负责给定区域内设备的控制
LINCOLN ELECTRIC K437 GAS SOLENOID KIT NIB
ALLEN BRADLEY 1769-IQ6X0W4 COMBINATION RELAY 1769IQXOW4
LG SZL-WL-G LIMIT SWITCH SZLWLG NIB
GENERAL ELECTRIC 8651831G1 STANDARD ROUGHNESS SPECIMENT
TELEMECANIQUE LP4-D1210BD3 CONTACTOR 12AMP 24V LP4D1210
TELEMECANIQUE XCK-J59H7 SAFTEY INTERLOCK SWITCH XCKJ59H
ASCO 302341 SPARE PART KIT 302-341 NIB
NIB JOHNSON CONTROLS P70SA-1 MIRCO-SWITCH CONTROL
LOT OF 10 MICHIGAN CUTTING TOOL 1-1/8-16 L.H SCREWS
NIB IKO CF 30 UUR CAM FLOWER CF30UUR
BIMBA EF1 EFT-6390-3BCE CYLINDER
TELEMECANIQUE XCMD2110L2 LIMIT SWITCH
NIB SPX HYTEC 301013 REPAIR KIT NITRILE
NUMATICS 2500D01-03A-03 PNEUMATIC CYLINDER
ACTION INSTRUMENTS 4130-123 ISOLATOR 4130123 XLNT
ALLEN BRADLEY 871C-A5N18-A2 SENSOR 871CA5N18A2 NIB
DWYER W31U MAGNEHELIC PRESSURE GAUGE W31U RU