描述
采用并行总线，其I/O模件必需与控制器模件相邻。采用串行总线的情况下，I/O板和控制器之间的距离也要比较近才行。最好把控制器模件和I/O模件装在一个机柜内或相邻的机柜内。远程I/O应该采用现场总线。如CAN、LONWORKS、HART总线等。现场总线是90年代初发展起来的。在I/O板中从硬件来说应该有能接收现场总线来的信号的输入、输出板。从软件来说在控制器中应该有读取和写到现场总线信号的功能块
Edwards iQDP80 Dry Vacuum Pump Rebuilt
One year parts and labor warranty.
USED:Vacuum pump system consisting of: Travaini liquid
USED: Nash liquid ring vacuum pump, model CL-1002, cast
USED: Nash liquid ring vacuum pump, model CL-2002, cast
Leybold Heraeus – Ruvac Vacuum pump – New Mod. WS2000
Holmes HV700 Blower Vacuum Pump 470.0 CFM
