在双总线网络中，这样放置总线控制器可以最大限度减小两个单元之间总线的拥堵。总线拥堵的结果是–些设备交换总线控制权，使其它的设备不能被其中一个单元读写。这种错误情况下第一-单元会控制VO,以免输入丢失和输出不同步。
Adept 01182-000 Dual C Amp Board
Modicon PC-0984-485 Programmable Controller
National Instruments VXI-TB-196
IPITEK RPR-CH Reserve Optical
IPITEK RPR-AUX 24 Auxiliary Power Supply
Kahnetics Weller KDS834A Dispensing Systems
Lenze 33.8201-E Drive
180 AVC F9025S12H Fans in Case 12VDC 3.6 x 3.6-inch (92
Fine Sodick TIF-01 PC4181294 T0173 Board
2 SMC MGQM50-M2330-75 Pneumatic Cylinder
FOXBORO 136-1 COMPUTING RELAY
EVERETT CHARLES 4450122-003 CIRCUIT BOARD TESTER
ABB SOLID STATE TRIP TYPE SS SS5G
3 P&H HARNISCHFEGER 79U79 STABILITY MODULE
MODICON AS-B872-200 OUTPUT MODULE ANALOG
AB ALLEN-BRADLEY SLC150 1745-LP153 PROCESSOR UNIT
PANASONIC MFA024LA2NS AC SERVO MOTOR
PANASONIC MFA024LA2NS AC SERVO MOTOR 1
ADEPT 90400 XY-HRS AD ACTUATOR
FOXBORO DM400YP-0A I/A SERIES
FOXBORO CM400YR-0C I/A SERIES
FOXBORO I/A P0400QK PER TAPE W/CONT
FOXBORO F6501A-A RS485-RS232 Converter
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