S7200英文[共13頁]

The S7-200 equipment is designed to be easy to install. You can use the mounting holes to attach the modules to a panel, or you can use the built-in clips to mount the modules onto a standard (DIN) rail. The small size of the S7-200 allows you to make efficient use of space. You can install an S7-200 either on a panel or on a standard rail, and you can orient the S7-200 either horizontally or vertically.Separate the S7-200 Devices from Heat, High Voltage, and Electrical NoiseAs a general rule for laying out the devices of your system, always separate the devices that generate high voltage and high electrical noise from the low-voltage, logic-type devices such as the S7-200. When configuring the layout of the S7-200 inside your panel, consider the heat-generating devices and locate the electronic-type devices in the cooler areas of your cabinet. Operating any electronic device in a high-temperature environment reduces the time to failure.Consider also the routing of the wiring for the devices in the panel. Avoid placing low voltage signal wires and communication cables in the same tray with AC power wiring and high-energy, rapidly-switched DC wiring.Provide Adequate Clearance for Cooling and WiringS7-200 devices are designed for natural convection cooling. For proper cooling, you must provide a clearance of at least 25 mm above and below the devices. Also, allow at least 75 mm of depth.Tip:For vertical mounting, the maximum allowable ambient temperature is reduced by 105 C. Mount the S7-200 CPU below any expansion modules. When planning your layout for the S7-200 system, allow enough clearance for the wiring and communication cable connections. For additional flexibility in configuring the layout of the S7-200 system, use the I/O expansion cable.Power BudgetAll S7-200 CPUs have an internal power supply that provides power for the CPU, the expansion modules, and other 24 VDC user power requirements. The S7-200 CPU provides the 5 VDC logic power needed for any expansion in your system. Pay careful attention to your system configuration to ensure that your CPU can supply the 5V power required by your selected expansion modules. If your configuration requires more power than the CPU can supply, you must remove a module or select a CPU with more power capability. Refer to Appendix A in the S7-200 Programmable Controller System Manual for information about the 5 VDC logic budget supplied by your S7-200 CPU and the 5 VDC power requirements of the expansion modules. Use Appendix B in the S7-200 Programmable Controller System Manual as a guide for determining how much power (or current) the CPU can provide for your configuration.All S7-200 CPUs also provide a 24 VDC sensor supply that can supply 24 VDC for input points, for relay coil power on the expansion modules, or for other requirements. If your power requirements exceed the budget of the sensor supply, then you must add an external 24 VDC power supply to your system. Refer to Appendix A in the S7-200 Programmable Controller System Manual for the 24 VDC sensor supply power budget for your particular S7-200 CPU. If you require an external 24 VDC power supply, ensure that the power supply is not connected in parallel with the sensor supply of the S7-200 CPU. For improved electrical noise protection, it is recommended that the commons (M) of the different power supplies be connected.Warning:Connecting an external 24 VDC power supply in parallel with the S7-200 24 VDC sensor supply can result in a conflict between the two supplies as each seeks to establish its own preferred output voltage level. The result of this conflict can be shortened lifetime or immediate failure of one or both power supplies, with consequent unpredictable operation of the PLC system. Unpredictable operation could result in death or serious injury to personnel, and/or damage to equipment and property.The S7-200 DC sensor supply and any external power supply should provide power to different points.The S7-200 can be easily installed on a standard DIN rail or on a panel.PrerequisitesBefore you install or remove any electrical device, ensure that the power to that equipment has been turned off. Also, ensure that the power to any related equipment has been turned off.Warning:Attempts to install or remove S7-200 or related equipment with the power applied could cause electric shock or faulty operation of equipment. Failure to disable all power to the S7-200 and related equipment during installation or removal procedures may result in death or serious personal injury, and/or damage to equipment. Always follow appropriate safety precautions and ensure that power to the S7-200 is disabled before attempting to install or remove S7-200 CPUs or related equipment.Always ensure that whenever you replace or install an S7-200 device you use the correct module or equivalent device.Warning:If you install an incorrect module, the program in the S7-200 could function unpredictably.Failure to replace an S7-200 device with the same model, orientation, or order may result in death or serious personal injury, and/or damage to equipment.Replace an S7-200 device with the same model, and be sure to orient and position it correctly.Mounting DimensionsThe S7-200 CPUs and expansion modules include mounting holes to facilitate installation on panels. Refer to the table below for the mounting dimensions.S7-200 ModuleWidth AWidth BCPU 221 and CPU 22290 mm82 mmCPU 224120.5 mm112.5 mmCPU 226 and CPU 226XM196 mm188 mmExpansion modules: 8-point DC and Relay I/O (8I, 8Q, and 4I/4Q)46 mm38 mmExpansion modules: 16-point digital I/O (8I/8Q), Analog I/O (4AI, 4AI/1AQ, 2AQ), RTD, Thermocouple, PROFIBUS, AS-Interface, 8-point AC (8I and 8Q), Position, and Modem71.2 mm63.2 mmExpansion modules: 32-point digital I/O (16I/16Q)137.3 mm129.3 mmInstalling a CPU or Expansion ModuleInstalling the S7-200 is easy. Just follow these steps.Panel Mounting1.Locate, drill, and tap the mounting holes (M4 or American Standard number 8), using the dimensions in the table above.2.Secure the module(s) to the panel, using the appropriate screws.3.If you are using an expansion module, connect the expansion module ribbon cable into the expansion port connector under the access door.DIN Rail Mounting1.Secure the rail to the mounting panel every 75 mm.2.Snap open the DIN clip (located on the bottom of the module) and hook the back of the module onto the DIN rail.3.If you are using an expansion module, connect the expansion module ribbon cable into the expansion port connector under the access door.4.Rotate the module down to the DIN rail and snap the clip closed. Carefully check that the clip has fastened the module securely onto the rail. To avoid damage to the module, press on the tab of the mounting hole instead of pressing directly on the front of the module.Tip:Using DIN rail stops may be helpful if your S7-200 is in an environment with high vibration potential or if the S7-200 has been installed vertically.If your system is in a high-vibration environment, then panel-mounting the S7-200 will provide a greater level of vibration protection.Removing a CPU or Expansion ModuleTo remove an S7-200 CPU or expansion module, follow these steps: 1.Remove power from the S7-200.2.Disconnect all the wiring and cabling that is attached to the module. Most S7-200 CPU and expansion modules have removable connectors to make this job easier.3.If you have expansion modules connected to the unit that you are removing, open the access cover door and disconnect the expansion module ribbon cable from the adjacent modules.4.Unscrew the mounting screws or snap open the DIN clip.5.Remove the module.Removing and Reinstalling the Terminal Block ConnectorMost S7-200 modules have removable connectors to make installing and replacing the module easy. Refer to Appendix A in the S7-200 Programmable Controller System Manual to determine whether your S7-200 module has removable connectors. You can order an optional fan-out connector for modules that do not have removable connectors. See Appendix E in the S7-200 Programmable Controller System Manual for order numbers.To Remove the Connector1.Open the connector door to gain access to the connector.2.Insert a small screwdriver in the notch in the middle of the connector.3.Remove the terminal connector by prying the screwdriver away from the S7-200 housing. See the figure below.To Reinstall the Connector1.Open the connector door.2.Align the connector with the pins on the unit and align the wiring edge of the connector inside the rim of the connector base.3. Press down firmly to rotate the connector until it snaps into place. Check carefully to ensure that the connector is properly aligned and fully engaged.Proper grounding and wiring of all electrical equipment is important for helping to ensure the optimum operation of your system and for providing additional electrical noise protection for your application and the S7-200.PrerequisitesBefore you ground or install wiring to any electrical device, ensure that the power to that equipment has been turned off. Also, ensure that the power to any related equipment has been turned off.Ensure that you follow all applicable electrical codes when wiring the S7-200 and related equipment. Install and operate all equipment according to all applicable national and local standards. Contact your local authorities to determine which codes and standards apply to your specific case.Warning:Attempts to install or wire the S7-200 or related equipment with power applied could cause electric shock or faulty operation of equipment. Failure to disable all power to the S7-200 and related equipment during installation or removal procedures may result in death or serious personal injury, and/or damage to equipment. Always follow appropriate safety precautions and ensure that power to the S7-200 is disabled before attempting to install or remove the S7-200 or related equipment.Always take safety into consideration as you design the grounding and wiring of your S7-200 system. Electronic control devices, such as the S7-200, can fail and can cause unexpected operation of the equipment that is being controlled or monitored. For this reason, you should implement safeguards that are independent of the S7-200 to protect against possible personal injury or equipment damage.Warning:Control devices can fail in an unsafe condition, resulting in unexpected operation of controlled equipment. Such unexpected operations could result in death or serious personal injury, and/or equipment damage. Consider using an emergency stop function, electromechanical overrides, or other redundant safeguards that are independent of the S7-200.Guidelines for IsolationS7-200 AC power supply boundaries and I/O boundaries to AC circuits are rated 1500 VAC. These isolation boundaries have been examined and approved as providing double safe separation between AC line and low voltage circuits. All low voltage circuits connected to an S7-200, such as 24V power, must be supplied from an approved source that provides safe isolation from AC line and other high voltages. Such sources include double insulation as defined in international electrical safety standards, and have outputs that are rated as SELV, PELV, Class 2, or Limited Voltage according to various standards.Warning:Use of non-isolated or single insulation supplies to supply low voltage circuits from an AC line can result in hazardous voltages appearing on circuits that are expected to be touch safe, such as communication circuits and low voltage sensor wiring.Such unexpected high voltages can result in serious personal injury, death, or significant property damage.Always use only high voltage to low voltage power converters that are approved as sources of touch safe, limited voltage circuits.Guidelines for Grounding the S7-200The best way to ground your application is to ensure that all the common connections of your S7-200 and related equipment are grounded to a single point. This single point should be connected directly to the earth ground for your system.For improved electrical noise protection, it is recommended that all DC common returns be connected to the same single-point earth ground. Connect the 24 VDC sensor supply common (M) to earth ground.All ground wires should be as short as possible and should use a large wire size, such as 2 mm2 (14 AWG). When locating grounds, remember to consider safety grounding requirements and the proper operation of protective interrupting devices.Guidelines for Wiring the S7-200When designing the wiring for your S7-200, provide a single disconnect switch that simultaneously removes power from the S7-200 CPU power supply, from all input circuits, and from all output circuits. Provide overcurrent protection, such as a fuse or circuit breaker, to limit fault currents on supply wiring. You may want to provide additional protection by placing a fuse or other current limit in each output circuit.Install appropriate surge suppression devices for any wiring that could be subject to lightning surges.Avoid placing low-voltage signal wires and communication cables in the same wire tray with AC wires and high-energy, rapidly switched DC wires. Always route wires in pairs, with the neutral or common wire paired with the hot or signal-carrying wire.Use the shortest wire possible and ensure that the wire is sized properly to carry the required current. The connector accepts wire sizes from 2 mm2 to 0.3 mm2 (14 AWG to 22 AWG). Use shielded wires for optimum protection against electrical noise. Typically, grounding the shield at the S7-200 gives the best results.When wiring input circuits that are powered by an external power supply, include an overcurrent protection device in that circuit. External protection is not necessary for circuits that are powered by the 24 VDC sensor supply from the S7-200 because the sensor supply is already current-limited.Most S7-200 modules have removable connectors for user wiring. (Refer to Appendix A in the S7-200 Programmable Controller System Manual to determine if your module has removable connectors.) To prevent loose connections, ensure that the connector is seated securely and that the wire is installed securely into the connector. To avoid damaging the connector, be careful to not over-tighten the screws. The maximum torque for the connector screw is 0.56 N-m (5 inch-pounds).To help prevent unwanted current flows in your installation, the S7-200 provides isolation boundaries at certain points. When you plan the wiring for your system, you should consider these isolation boundaries. Refer to Appendix A in the S7-200 Programmable Controller System Manual for the amount of isolation provided and the location of the isolation boundaries. Isolation boundaries rated less than 1500VAC must not be depended on as safety boundaries.Tip:For a communication network, the maximum length of the communication cable is 50 m without using a repeater. The communication port on the S7-200 is non-isolated. Refer to Building Your Network for more information.Guidelines for Suppression CircuitsYou should equip inductive loads with suppression circuits to limit voltage rise when the control output turns off. Suppression circuits protect your outputs from premature failure due to high inductive switching currents. In addition, suppression circuits limit the electrical noise generated when switching inductive loads.Tip:The effectiveness of a given suppression circuit depends on the application, and you must verify it for your particular use. Always ensure that all components used in your suppression circuit are rated for use in the application.DC Outputs and Relays That Control DC LoadsThe DC outputs have internal protection that is adequate for most applications. Since the relays can be used for either a DC or an AC load, internal protection is not provided.The figure below shows a sample suppression circuit for a DC load. In most applications, the addition of a diode (A) across the inductive load is suitable, but if your application requires faster turn-off times, then the addition of a Zener diode (B) is recommended. Be sure to size your Zener diode properly for the amount of current in your output circuit.AC Outputs and Relays That Control AC LoadsThe AC outputs have internal protection that is adequate for most applications. Since the relays can be used for either a DC or an AC load, internal protection is not provided.The figure below shows a sample suppression circuit for an AC load. In most applications, the addition of a metal oxide varistor (MOV) will limit the peak voltage and provide protection for the internal S7-200 circuits. Ensure that the working voltage of the MOV is at least 20% greater than the nominal line voltage.S7-200裝置的設(shè)計(jì)便于安裝。您可以使用安裝孔將模塊安裝在面板上，您也可以使用內(nèi)裝夾片將模塊安裝在標(biāo)準(zhǔn)（DIN）橫桿上。S7-200體積小，允許您有效地利用空間。您可以將S7-200安裝在面板上或安裝在標(biāo)準(zhǔn)橫桿上，S7-200可以橫放，也可以豎放。請勿讓S7-200設(shè)備接觸熱、高壓和電氣噪音作為放置系統(tǒng)設(shè)備的一般規(guī)則，始終將生成高壓和高電氣噪音的設(shè)備與生成低壓、邏輯型設(shè)備（例如S7-200）的裝置分開放置。在面板中配置S7-200布局時(shí)，應(yīng)當(dāng)考慮生成熱的設(shè)備，將電子型設(shè)備放置在機(jī)箱中溫度較低的位置。在高溫環(huán)境中操作任何電子設(shè)備都會(huì)增加發(fā)生故障的頻率。另請考慮面板中接線的路徑。避免將低壓信號(hào)線和通訊電纜與交流電線和高能快速切換直流電線放在同一個(gè)盒內(nèi)。提供適當(dāng)?shù)睦鋮s和接線空間S7-200設(shè)備的設(shè)計(jì)適用于自然對流冷卻。為了達(dá)到適當(dāng)?shù)睦鋮s目的，您必須在設(shè)備的上方和下方至少留出25毫米的空間。此外，至少留出75毫米的深度。提示：對于縱向安裝，允許的最大環(huán)境溫度會(huì)降低攝氏105度。將S7-200 CPU安裝在任何擴(kuò)展模塊的下方。在規(guī)劃S7-200系統(tǒng)的布局時(shí)，請為接線和通訊電纜連接留出足夠的空間。為了獲得配置S7-200系統(tǒng)布局的更大的靈活性，請使用I/O擴(kuò)展電纜。電源預(yù)算所有的S7-200 CPU都有一個(gè)為CPU、擴(kuò)展模塊和其他24 VDC用戶電源要求提供電源的內(nèi)部電源。S7-200 CPU提供系統(tǒng)中任何擴(kuò)展所需的5 VDC邏輯電源。請?zhí)貏e注意系統(tǒng)配置，確保CPU可提供所選擴(kuò)展模塊要求的5V電源。如果您的配置要求的電源超出CPU提供的電源范圍，則必須拆卸一個(gè)模塊，或選擇一個(gè)功能更大的CPU。請參閱S7-200可編程控制器系統(tǒng)手冊中的附錄A，查閱有關(guān)S7-200 CPU提供的5 VDC邏輯預(yù)算以及擴(kuò)展模塊的5 VDC電源要求。請將S7-200可編程控制器系統(tǒng)手冊附錄B用作指南，確定CPU可為您的配置提供的功率（或電流）。所有的S7-200 CPU還提供一個(gè)24 VDC傳感器電源，可為輸入點(diǎn)、擴(kuò)展模塊上的繼電器線圈電源或其他要求提供24 VDC。如果您的電源要求超過傳感器電源的預(yù)算，您必須在系統(tǒng)中增加一個(gè)外接24 VDC電源。請參閱S7-200可編程控制器系統(tǒng)手冊附錄A，了解有關(guān)您的特定S7-200 CPU的24 VDC傳感器電源預(yù)算的信息。如果您需要安裝一個(gè)外接24 VDC電源，核實(shí)電源不得與S7-200 CPU傳感器電源并連。欲獲得進(jìn)一步電氣噪聲保護(hù)，建議將不同電源的公共導(dǎo)線（M）連接在一起。警告：將外接24 VDC電源與S7-200 24 VDC傳感器電源并連會(huì)導(dǎo)致兩種電源之間的沖突，因?yàn)槊糠N電源都尋求建立自身需要的輸出電壓水平。此一沖突的結(jié)果會(huì)縮短一種或兩種電源的使用壽命或立即發(fā)生故障，并隨之導(dǎo)致PLC系統(tǒng)不可預(yù)測的操作狀況。不可預(yù)測的操作狀況會(huì)導(dǎo)致死亡或嚴(yán)重人身傷害和或裝置和財(cái)產(chǎn)損壞。S7-200 DC傳感器電源和任何外接電源應(yīng)當(dāng)為不同的點(diǎn)提供電源。S7-200可方便地安裝在標(biāo)準(zhǔn)DIN橫桿上或安裝在面板上。先決條件在安裝或拆卸任何電氣設(shè)備之前，核實(shí)該裝置的電源已經(jīng)關(guān)閉。此外，核實(shí)任何相關(guān)裝置的電源已經(jīng)關(guān)閉。警告：在接通電源的情況下嘗試安裝或拆卸S7-200或相關(guān)裝置會(huì)造成電擊或裝置操作發(fā)生故障。 在安裝或拆卸程序中不禁止S7-200及相關(guān)裝置的所有電源會(huì)導(dǎo)致死亡或嚴(yán)重人身傷害和或裝置損壞。始終遵循適當(dāng)?shù)陌踩胧⒋_保在嘗試安裝或拆卸S7-200 CPU或相關(guān)裝置之前已經(jīng)禁止S7-200的電源。每當(dāng)您更換或安裝S7-200設(shè)備時(shí)，始終確保使用正確的模塊或等同設(shè)備。警告：如果安裝了不正確的模塊，S7-200中的程序會(huì)以不可預(yù)測的方式作業(yè)。不使用相同的型號(hào)、沿相同的方向或順序替換S7-200設(shè)備會(huì)導(dǎo)致死亡或嚴(yán)重人身傷害和或裝置損壞。用相同的型號(hào)替換S7-200設(shè)備，確保方向和位置正確。安裝尺寸S7-200 CPU和擴(kuò)展模塊包括用于在面板上安裝的安裝孔。請參閱下表中的安裝尺寸。S7-200模塊寬度A寬度BCPU 221和CPU 22290毫米82毫米CPU 224120.5毫米112.5毫米CPU 226和CPU 226XM196毫米188毫米擴(kuò)展模塊：8針直流電和繼電器I/O（8I、8Q和4I/4Q）46毫米38毫米擴(kuò)展模塊：16針數(shù)字I/O（8I/8Q）、模擬I/O（4AI、4AI/1AQ、2AQ）、RTD、熱電偶、PROFIBUS、AS接口、8針交流電（8I和8Q）、位置和調(diào)制解調(diào)器71.2毫米63.2毫米擴(kuò)展模塊：32點(diǎn)數(shù)字I/O（16I/16Q）137.3毫米129.3毫米安裝CPU或擴(kuò)展模塊安裝S7-200十分簡便。只需遵循以下步驟。面板安裝1.使用上表中的尺寸，定位、鉆孔和輕敲安裝孔（M4或美國標(biāo)準(zhǔn)8號(hào)）。2.用適當(dāng)?shù)穆萁z釘將模塊固定在面板上。3.如果您使用的是擴(kuò)展模塊，將擴(kuò)展模塊帶狀電纜與訪問門下方的擴(kuò)展端口接頭連接。DIN橫桿安裝1.每隔75毫米將橫桿固定在安裝面板上。2.咔嚓一聲打開（位于模塊底部的）DIN夾片，并將模塊背面扣在DIN橫桿上。3.如果您使用的是擴(kuò)展模塊，將擴(kuò)展模塊帶狀電纜與訪問門下方的擴(kuò)展端口接頭連接。4.將模塊向下旋轉(zhuǎn)至DIN橫桿位置，咔嚓一聲將夾片關(guān)閉。請仔細(xì)檢查夾片是否夾緊，模塊是否安全地固定在橫桿上。為了避免損壞模塊，按安裝孔的標(biāo)記，而不要直接按模塊前側(cè)。提示如果S7-200位于的環(huán)境帶有高振蕩電位或者S7-200沿垂直方向安裝，使用DIN橫桿阻塊可能會(huì)有幫助。如果系統(tǒng)位于高振蕩環(huán)境，則面板安裝S7-200會(huì)提供較高的振蕩保護(hù)水平。取出CPU或擴(kuò)展模塊欲取出S7-200 CPU或擴(kuò)展模塊，請遵循以下步驟：1.斷開S7-200電源。2.斷開所有與模塊連接的線路和電纜。大多數(shù)S7-200 CPU和擴(kuò)展模塊配有可移動(dòng)接頭，便于完成此項(xiàng)工作。3.如果擴(kuò)展模塊與您正在拆卸的裝置連接，打開訪問蓋門，并從相臨的模塊上斷開擴(kuò)展模塊帶狀電纜連接。4.松開安裝螺絲或咔嚓一聲松開DIN夾片。5.取出模塊。取出和重新安裝終端塊接頭大多數(shù)S7-200模塊配有可移動(dòng)接頭，便于安裝和替