【導讀】問題予以充分重視,進行正確的操作。在本安全守則中安全注意事項按等級分為兩類：“!危險”和“!警告”。表明，不正確的處理可能會導致在危險的條件下，造成嚴重傷害或死亡。.即使外部電源或PLC的模塊有問題也應該安裝一個安全的外部電路的PLC，以便讓整個系統(tǒng)安全。一個外部監(jiān)測電路，將監(jiān)測任何單一輸出，可能導致嚴重的麻煩。為防止這種情況，設定一個外部安全電路，如保險絲。對PLC的運行，仔細閱讀手冊，并充分確認安全。障，所以立即行動可能不會被采取的。除了配置了聯(lián)鎖電路中的序列程序，糾正措施。載入后，請檢查是否取消。不這樣做可能會導致觸電或損壞產(chǎn)。請注意，當QnPHCPU使用時在線模式會變化。擰緊螺絲在指定的扭矩范圍。.當線路中的PLC，確保它是正確的，檢查產(chǎn)品的額定電壓和終端布局。當CPU模塊利用重置/L的切換和程序已經(jīng)。作，CPU模塊進入運行狀態(tài)。該用戶的手冊描述的是進程的CPU的硬件規(guī)格和處理方法。模式QCPU，CPU的過程有以下額外的操作指示和功能。

　　

【正文】 eld so that good surface contact can be made between the cabi and plate. (c) To ensure good electrical contact with the control cabi, mask the paint on the installation bolts of the inner plate in the control cabi so that contact between surfaces can be ensured over the widest possible area. (d) Earth the control cabi with a thick wire so that a low impedance connection to ground can be ensured even at high frequencies. (e) Holes made in the control cabi must be 10 cm ( inch) diameter or less. If the holes are 10cm or larger,radio frequency noise may be emitted. In addition, because radio waves leak through a clearance between the control panel door and the main unit,reduce the clearance as much as practicable. The leakage of radio waves can be suppressed by the direct application of an EMI gasket on the paint surface. (2) Connection of power and earth wires Earthing and power supply wires for the PLC system must be connected as described below. (a) Provide an earthing point near the power supply module. Earth the power supply39。s LG and FG terminals (LG : Line Ground, FG : Frame Ground) with the thickest and shortest wire possible. (The wire length must be 30 cm ( inch) or shorter.) The LG and FG terminals function is to pass the noise generated in the PLC system to the ground, so an impedance that is as low as possible must be ensured. As the wires are used to relieve the noise, the wire itself carries a large noise content and thus short wiring means that the wire is prevented from acting as an antenna. (b) The earth wire led from the earthing point must be twisted with the power supply twisting with the earthing wire,noise flowing from the power 西安石油大學本科畢業(yè)設計 （論文） supply wires can be relieved to the ,if a filter is installed on the power supply wires,the wires and the earthing wire may not need to be twisted. [Cables] The cables extracted from the control panel contain a high frequency noise the outside of the control panel, therefore, they serve as antennas to emit prevent noise emission,use shielded cable for the cables which are connected to the I/O modules and intelligent function modules and may be extracted to the outside of the control panel. The use of a shielded cable also increases noise resistance. The signal lines connected to the PLC I/O modules and intelligent function modules use shielded cables to assure noise resistance under the conditions where the shield is earthed. If a shielded cable is not used or not earthed correctly, the noise resistance will not meet the specified the shield of a shielded cable is earthed to the cabi bod y,please ensure that the shield contact with the body is over a large surface the cabi body is painted it will be necessary to remove paint from the contact fastenings must be metallic and the shield and earthing contact must be made over the largest available surface area. If the contact surfaces are too uneven for optimal contact to be made either use washers to correct for surface inconsistencies or use an abrasive to level the surfaces. The following diagrams show examples of how to provide good surface contact of shield earthing by use of a cable clamp. (1) Earthing of shielded of shield cable (a) Earth the shield of the shielded cable as near the module as possible taking care so that the earthed cables are not induced electromagically by the cable to be earthed. (b) Take an appropriate measures so that the shield section of the shielded cable from which the outer cover was partly removed for exposure is earthed to the control panel on an increased contact clamp may also be used as shown in the figure this case,however,apply a cover to the painted inner wall surface of the control panel which es in contact with the clamp. Note) The method of earthing by soldering a wire onto the shield section of the shielded 西安石油大學本科畢業(yè)設計 （論文） cable as shown below is not high frequency impedance will increase and the shield will be ineffective. (2) MELSECNET/H module Always use a doubleshielded coaxial cable (MITSUBISHI CABLE INDUSTRIES,LTD.:5C2VCCY) for the coaxial cables MELSECNET/H module. Radiated noise in the range of 30MHz or higher can be suppressed by use of the doubleshielded coaxial the doubleshielded coaxial cable by connecting its outer shield to the ground. Refer to (3) for the earthing of the shield. (3) Ether module, Web server module Precautions for using AUI cables, twisted pair cables and coaxial cables are described below. (a) Always earth the AUI cables connected to the 10BASE5 connectors. Because the AUI cable is of the shielded type,strip part of the outer cover and earth the exposed shield section to the ground on the widest contact surface as shown below. Refer to (4) for the earthing of the shield. (b) Use shielded twisted pair cables as the twisted pair cables connected to the 10BASET/100BASETX the shielded twisted pair cables,strip part of the outer cover and earth the exposed shield section to the ground on the widest contact surface as shown below. 西安石油大學本科畢業(yè)設計 （論文） Refer to (5) for the earthing of the shield. (c) Always use doubleshielded coaxial cables as the coaxial cables connected to the 10BASE2 connectors. Earth the doubleshielded coaxial cable by connecting its outer shield to the ground. Refer to (6) for the earthing of the shield. (4) I/O signal lines and other munication cables For the I/O signal lines and other munication cables lines (RS232,RS422, CCLink,etc.),if extracted to the outside of the control panel, also ensure to earth the shield section of these lines and cables in the same manner as in item (1) above. The Mitsubishi generalpurpose programmable logic controller has been designed and manufactured for applications in general industries, etc. Thus, applications i