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1、 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 S

2、7-200 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 Noise As a general rule for laying out the devices of your system, always separate the devices that generate high

3、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 devi

4、ce 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 A

5、dequate Clearance for Cooling and Wiring S7-200 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

6、 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 exp

7、ansion cable. Power Budget All 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 sy

8、stem 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 Contr

9、oller 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 yo

10、ur 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 su

11、pply 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

12、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 a

13、s 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 pe

14、rsonnel, 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. Prerequisites Before you install or remove any electrical device, ens

15、ure 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 disa

16、ble 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

17、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 s

18、ame 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 Dimensions The S7-200 CPUs and expansion modules include mounting holes to facilitat

19、e installation on panels. Refer to the table below for the mounting dimensions. S7-200 Module Width A Width B CPU 221 and CPU 222 90 mm 82 mm CPU 224 120.5 mm 112.5 mm CPU 226 and CPU 226XM 196 mm 188 mm Expansion modules: 8-point DC and Relay I/O (8I, 8Q, and 4I/4Q) 46 mm 38 mm Expansion m

20、odules: 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 Modem 71.2 mm 63.2 mm Expansion modules: 32-point digital I/O (16I/16Q) 1

21、37.3 mm 129.3 mm Installing a CPU or Expansion Module Installing the S7-200 is easy. Just follow these steps. Panel Mounting 1. 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, us

22、ing 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 Mounting 1. Secure the rail to the mounting panel every 75 mm. 2. Snap open the DIN clip (located on the bottom

23、 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 tha

24、t 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

25、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 Module To remove an S7-200 CPU or expansion module, follow these steps: 1. Remove power

26、 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 disco

27、nnect 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 Connector Most S7-200 modules have removable connectors to make installing and replacing the modul

28、e 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 Syste

29、m Manual for order numbers. To Remove the Connector 1. 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 fig

30、ure below. To Reinstall the Connector 1. 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 e

31、nsure 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. Prereq

32、uisites Before 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 e

33、quipment. 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 cau

34、se 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 powe

35、r 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

36、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 contr

37、olled 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 Isolation S7-200 AC power

38、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 fr

39、om 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. War

40、ning: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 se

41、rious 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 S7-200 The best way to ground your application is to ensure that all the comm

42、on 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

43、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 inter

44、rupting devices. Guidelines for Wiring the S7-200 When 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 fus

45、e 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

46、-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 p

47、roperly 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 b

48、y 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 fo

49、r 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

50、 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 sho

51、uld 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

52、 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 Circuits You should equip inductive loads with suppressio

53、n 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 effectivene

54、ss 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 Loads The DC outputs have internal protecti

55、on 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

56、 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 Loads The AC outputs have internal protection that is ad

57、equate 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 provi

58、de 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裝置的設計便于安裝。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準（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準橫桿上，S7-200可以橫放，也可以豎放。 請勿讓S7-200設備接觸熱、高壓和電氣

59、噪音 作為放置系統(tǒng)設備的一般規(guī)則，始終將生成高壓和高電氣噪音的設備與生成低壓、邏輯型設備（例如S7-200）的裝置分開放置。 在面板中配置S7-200布局時，應當考慮生成熱的設備，將電子型設備放置在機箱中溫度較低的位置。在高溫環(huán)境中操作任何電子設備都會增加發(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盒內(nèi)。 提供適當?shù)睦鋮s和接線空間 S7-200設備的設計適用于自然對流冷卻。為了達到適當?shù)睦鋮s目的，您必須在設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

60、裝，允許的最大環(huán)境溫度會降低攝氏105度。將S7-200 CPU安裝在任何擴展模塊的下方。 在規(guī)劃S7-200系統(tǒng)的布局時，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擴展電纜。 電源預算 所有的S7-200 CPU都有一個為CPU、擴展模塊和其他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，則必須拆卸一個模塊，或選擇一個功能更大的CPU。請參閱《S7

61、-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邏輯預算以及擴展模塊的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24 VDC傳感器電源，可為輸入點、擴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算，您必須在系統(tǒng)中增加一個外接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傳感器電源預算的信息。 如果您需要安裝一個外接24

62、 VDC電源，核實電源不得與S7-200 CPU傳感器電源并連。欲獲得進一步電氣噪聲保護，建議將不同電源的公共導線（M）連接在一起。 警告：將外接24 VDC電源與S7-200 24 VDC傳感器電源并連會導致兩種電源之間的沖突，因為每種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，并隨之導致PLC系統(tǒng)不可預測的操作狀況。不可預測的操作狀況會導致死亡或嚴重人身傷害和／或裝置和財產(chǎn)損壞。S7-200 DC傳感器電源和任何外接電源應當為不同的點提供電源。 S7-200可方便地安裝在標準DIN橫桿上或安裝在面板上。 先決條件 在

63、安裝或拆卸任何電氣設備之前，核實該裝置的電源已經(jīng)關(guān)閉。此外，核實任何相關(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)裝置的所有電源會導致死亡或嚴重人身傷害和／或裝置損壞。始終遵循適當?shù)陌踩胧?，并確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。 每當您更換或安裝S7-200設備時，始終確保使用正確的模塊或等同設備。 警告：如果安裝了不正確的模塊，S7-200中的程序會以不可預測的方式作業(yè)。不使用相同的型號、沿相同的方向或順序替換S7-2

64、00設備會導致死亡或嚴重人身傷害和／或裝置損壞。用相同的型號替換S7-200設備，確保方向和位置正確。 安裝尺寸 S7-200 CPU和擴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B CPU 221和CPU 222 90毫米 82毫米 CPU 224 120.5毫米 112.5毫米 CPU 226和CPU 226XM 196毫米 188毫米 擴展模塊：8針直流電和繼電器I/O（8I、8Q和4I/4Q） 46毫米 38毫米 擴展模塊：16針數(shù)字I/O（8I/8Q）、模擬I/O（4AI、4AI/1AQ、2AQ）、RTD、熱電偶、

65、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 擴展模塊：32點數(shù)字I/O（16I/16Q） 137.3毫米 129.3毫米 安裝CPU或擴展模塊 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或美國標準8號）。 2. 用適當?shù)穆萁z釘將模塊固定在面板上。 3. 如果您使用的是擴展模塊，將擴展模塊帶狀電纜與訪問門下方的擴展端口接頭連接。 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

66、）DIN夾片，并將模塊背面扣在DIN橫桿上。 3. 如果您使用的是擴展模塊，將擴展模塊帶狀電纜與訪問門下方的擴展端口接頭連接。 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橫桿阻塊可能會有幫助。如果系統(tǒng)位于高振蕩環(huán)境，則面板安裝S7-200會提供較高的振蕩保護水平。 取出CPU或擴展模塊 欲取出S7-200 CPU或擴展模塊，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和擴展模塊配有可移動接頭，便于完成此項工作。 3. 如果擴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模塊配有可移動接頭，便于安裝和替