70BK03B-ES-HESG447271R2 ABB 控制系统

品牌:ABB

型号:70BK03B-ES-HESG447271R2

结构形式:模块式

LD指令处理器:硬PLC

I/O点数:70BK03b-ESHESG447271R2

功能:70BK03b-ESHESG447271R2

工作电压:70BK03b-ESHESG447271R2

输出频率:70BK03b-ESHESG447271R2

加工定制:是

产地:美国

·安全地或电源接地

将电源线接地端和柜体连线接地为安全接地。如电源漏电或柜体带电，可从安全接地导入地下，不会对人造成伤害。·系统接地

PLC控制器为了与所控的各个设备同电位而接地，叫系统接地。接地电阻值不得大于4.Q，一般需将PLC设备系统地和控制柜内开关电源负端接在—起，作为控制系统地。

信号与屏蔽接地

一般要求信号线必须要有唯一的参考地，屏蔽电统遇到有可能产生传导干扰的场合，也要在就地或者控制室唯一接地，防止形成“地环路”。信号源接地时，屏蔽层应在信号侧接地;不接地时，应在PLC侧接地;信号线中间有接头时，屏蔽层应牢固连接并进行绝缘处理，一定要避免多点接地;多个测点信号的屏蔽双绞线与多芯对绞总屏蔽电缆连接时，各屏蔽层应相互连接好，并经绝缘处理，选择适当的接地处单点接点。

提高PLC控制系统可靠性的方法1重视安装

提高PLC控制系统可靠性是一项长期、持久的工作。首先，施工和安装是非常重要的环节，必须严格把关，这样可减少投产故障率。其次，要保证检修质量，特别是技改线路改动和系统改造，是目前的当务之急。否则，几年的系统改造后，大量线路的更换，线号丢失及程序变更，该记录备份的没有做记录等。致使维护工作量加大，可靠性得不到保证。这一项是人们极易疏忽的，必需引起高度重视。

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70BK03B-ES-HESG447271R2 ABB 控制系统

Brand :ABB

Model :70BK03B-ES-HESG447271R2

Structure: modular

LD instruction processor: hard PLC

I/O count :70BK03b-ESHESG447271R2

Function :70BK03b-ESHESG447271R2

Working voltage :70BK03b-ESHESG447271R2

Output frequency :70BK03b-ESHESG447271R2

Processing customization: Yes

Origin: USA

· Safe or power grounding

Use the grounding terminal of the power cable and the cabinet grounding as safety grounding. If the power leaks or the cabinet is live, it can be led into the ground from the safety ground, without causing harm to people. · System grounding

The PLC controller is grounded to the same potential with each device controlled, which is called system grounding. The grounding resistance value shall not be greater than 4.Q. Generally, the PLC device should be systematically connected to the negative end of the switching power supply in the control cabinet as a control system.

The signal is grounded to the shield

Generally, the signal line must have a unique reference point, and the shielded electrical system must be uniquely grounded in the local or control room to prevent the formation of a "ground loop". When the signal source is grounded, the shielding layer should be grounded on the signal side. When not grounded, should be grounded on the PLC side; When there is a joint in the middle of the signal line, the shielding layer should be firmly connected and insulated, and multi-point grounding must be avoided. When the shielded twisted pair of multiple measuring points signals is connected with the multi-core twisted total shielded cable, each shield layer should be connected to each other, and be insulated, and select the appropriate connection point for single contact.

Methods to improve the reliability of PLC control system 1 Pay attention to installation

Improving the reliability of PLC control system is a long-term and lasting work. First of all, construction and installation is a very important link, must be strictly checked, so as to reduce the failure rate of production. Secondly, to ensure the quality of maintenance, especially the technical transformation of the line change and system transformation, is the current top priority. Otherwise, after several years of system transformation, a large number of lines will be replaced, the line number will be lost and the program will be changed, and the record backup will not be recorded. Resulting in increased maintenance workload, reliability can not be guaranteed. This one is easily overlooked and must be paid great attention to.

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