There are three types of system grounding methods:floating grounding,direct grounding and capacitive grounding.For the DCS control system,it is a high-speed low-level control device and should be directly grounded.Due to the influence of the distributed capacitance of the signal cable and the filtering of the input device,the signal exchange frequency between the devices is generally lower than 1MHz,so the grounding wire of the DCS control system adopts one point grounding and one point grounding in series.The centrally arranged DCS system is suitable for one-point grounding in parallel,and the central grounding point of the cabinet of each device leads to the grounding electrode with a separate grounding wire.
系统接地方式有：浮地方式、直接接地方式和电容接地三种方式。对DCS控制系统而言，它属高速低电平控制装置，应采用直接接地方式。由于信号电缆分布电容和输人装置滤波等的影响，装置之间的信号交换频率一般都低于1MHz，所以DCS控制系统接地线采用一点接地和串联一点接地方式。集中布置的DCS系统适于并联一点接地方式，各装置的柜体中心接地点以单独的接地线引向接地极。
NEW FOXBORO 136-5-1 13651 136 COMPUTING RELAY
NEW FOXBORO 136-1 1361 136 COMPUTING RELAY NEW
FOXBORO I/A SERIES P0970EJ DUAL NODE BUS EXTENDER
FOXBORO 761CNA-AT USPP 761CNAAT
FOXBORO L0111LE USPP L0111LE
FOXBORO CM400YL USPP CM400YL
FOXBORO L0120LB USPP L0120LB
FOXBORO P0400YV USPP P0400YV
FOXBORO A7000FG USPP A7000FG
FOXBORO PM400DA USPP PM400DA
63U-BT-OHER-F FOXBORO
FOXBORO A2050UZ USPP A2050UZ
