S7200英文[共13页]

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装置的设计便于安装。您可以使用安装孔将模块安装在面板上，您也可以使用内装夹片将模块安装在标准（DIN）横杆上。S7-200体积小，允许您有效地利用空间。您可以将S7-200安装在面板上或安装在标准横杆上，S7-200可以横放，也可以竖放。请勿让S7-200设备接触热、高压和电气噪音作为放置系统设备的一般规则，始终将生成高压和高电气噪音的设备与生成低压、逻辑型设备（例如S7-200）的装置分开放置。在面板中配置S7-200布局时，应当考虑生成热的设备，将电子型设备放置在机箱中温度较低的位置。在高温环境中操作任何电子设备都会增加发生故障的频率。另请考虑面板中接线的路径。避免将低压信号线和通讯电缆与交流电线和高能快速切换直流电线放在同一个盒内。提供适当的冷却和接线空间S7-200设备的设计适用于自然对流冷却。为了达到适当的冷却目的，您必须在设备的上方和下方至少留出25毫米的空间。此外，至少留出75毫米的深度。提示：对于纵向安装，允许的最大环境温度会降低摄氏105度。将S7-200 CPU安装在任何扩展模块的下方。在规划S7-200系统的布局时，请为接线和通讯电缆连接留出足够的空间。为了获得配置S7-200系统布局的更大的灵活性，请使用I/O扩展电缆。电源预算所有的S7-200 CPU都有一个为CPU、扩展模块和其他24 VDC用户电源要求提供电源的内部电源。S7-200 CPU提供系统中任何扩展所需的5 VDC逻辑电源。请特别注意系统配置，确保CPU可提供所选扩展模块要求的5V电源。如果您的配置要求的电源超出CPU提供的电源范围，则必须拆卸一个模块，或选择一个功能更大的CPU。请参阅S7-200可编程控制器系统手册中的附录A，查阅有关S7-200 CPU提供的5 VDC逻辑预算以及扩展模块的5 VDC电源要求。请将S7-200可编程控制器系统手册附录B用作指南，确定CPU可为您的配置提供的功率（或电流）。所有的S7-200 CPU还提供一个24 VDC传感器电源，可为输入点、扩展模块上的继电器线圈电源或其他要求提供24 VDC。如果您的电源要求超过传感器电源的预算，您必须在系统中增加一个外接24 VDC电源。请参阅S7-200可编程控制器系统手册附录A，了解有关您的特定S7-200 CPU的24 VDC传感器电源预算的信息。如果您需要安装一个外接24 VDC电源，核实电源不得与S7-200 CPU传感器电源并连。欲获得进一步电气噪声保护，建议将不同电源的公共导线（M）连接在一起。警告：将外接24 VDC电源与S7-200 24 VDC传感器电源并连会导致两种电源之间的冲突，因为每种电源都寻求建立自身需要的输出电压水平。此一冲突的结果会缩短一种或两种电源的使用寿命或立即发生故障，并随之导致PLC系统不可预测的操作状况。不可预测的操作状况会导致死亡或严重人身伤害和或装置和财产损坏。S7-200 DC传感器电源和任何外接电源应当为不同的点提供电源。S7-200可方便地安装在标准DIN横杆上或安装在面板上。先决条件在安装或拆卸任何电气设备之前，核实该装置的电源已经关闭。此外，核实任何相关装置的电源已经关闭。警告：在接通电源的情况下尝试安装或拆卸S7-200或相关装置会造成电击或装置操作发生故障。 在安装或拆卸程序中不禁止S7-200及相关装置的所有电源会导致死亡或严重人身伤害和或装置损坏。始终遵循适当的安全措施，并确保在尝试安装或拆卸S7-200 CPU或相关装置之前已经禁止S7-200的电源。每当您更换或安装S7-200设备时，始终确保使用正确的模块或等同设备。警告：如果安装了不正确的模块，S7-200中的程序会以不可预测的方式作业。不使用相同的型号、沿相同的方向或顺序替换S7-200设备会导致死亡或严重人身伤害和或装置损坏。用相同的型号替换S7-200设备，确保方向和位置正确。安装尺寸S7-200 CPU和扩展模块包括用于在面板上安装的安装孔。请参阅下表中的安装尺寸。S7-200模块宽度A宽度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毫米扩展模块：8针直流电和继电器I/O（8I、8Q和4I/4Q）46毫米38毫米扩展模块：16针数字I/O（8I/8Q）、模拟I/O（4AI、4AI/1AQ、2AQ）、RTD、热电偶、PROFIBUS、AS接口、8针交流电（8I和8Q）、位置和调制解调器71.2毫米63.2毫米扩展模块：32点数字I/O（16I/16Q）137.3毫米129.3毫米安装CPU或扩展模块安装S7-200十分简便。只需遵循以下步骤。面板安装1.使用上表中的尺寸，定位、钻孔和轻敲安装孔（M4或美国标准8号）。2.用适当的螺丝钉将模块固定在面板上。3.如果您使用的是扩展模块，将扩展模块带状电缆与访问门下方的扩展端口接头连接。DIN横杆安装1.每隔75毫米将横杆固定在安装面板上。2.咔嚓一声打开（位于模块底部的）DIN夹片，并将模块背面扣在DIN横杆上。3.如果您使用的是扩展模块，将扩展模块带状电缆与访问门下方的扩展端口接头连接。4.将模块向下旋转至DIN横杆位置，咔嚓一声将夹片关闭。请仔细检查夹片是否夹紧，模块是否安全地固定在横杆上。为了避免损坏模块，按安装孔的标记，而不要直接按模块前侧。提示如果S7-200位于的环境带有高振荡电位或者S7-200沿垂直方向安装，使用DIN横杆阻块可能会有帮助。如果系统位于高振荡环境，则面板安装S7-200会提供较高的振荡保护水平。取出CPU或扩展模块欲取出S7-200 CPU或扩展模块，请遵循以下步骤：1.断开S7-200电源。2.断开所有与模块连接的线路和电缆。大多数S7-200 CPU和扩展模块配有可移动接头，便于完成此项工作。3.如果扩展模块与您正在拆卸的装置连接，打开访问盖门，并从相临的模块上断开扩展模块带状电缆连接。4.松开安装螺丝或咔嚓一声松开DIN夹片。5.取出模块。取出和重新安装终端块接头大多数S7-200模块配有可移动接头，便于安装和替