 | 广州鸿懿电气设备有限公司 |
产品 规格：【德国原装，全新*】
产品 质量：【*，假一罚十】
产品 价格：【薄利多销，行业zui低】
产品 货期：【库存销售，现买现卖】
：*
；
：
广州鸿懿电气设备有限公司竭诚为您服务
更多产品和报价咨询扫二维码加我
购物需知
1 、西门子 产品均为密封包装，外包装详见产品图片，白色标签上均有西门子品牌 LOGO 及产品订货号，各位买家在收到货后，请核对型号无误，再拆包装
2、本公司销售的产品一律为（原装* * 假一罚十 * 质保一年） 本公司签约正式的销售合同，开具 17% 的增值税发票、普通发票。
万喜堂app下载体育真人 6SL3210-1KE23-8UP1
西门子产品订货号：6SL32101KE238UP1
西门子产品价格：168 RMB
西门子产品净重： 1.100 Kg
西门子产品承诺：质保一年，原装*
西门子产品尺寸： 270.00 x 225.00 x 85.00
SINAMICS G120C, frame sizes FSAA to FSF, with Inligent Operator Panel IOP
SINAMICS G120C compact inverters offer a well-balanced combination of features to address a wide range of applications. They are compact, rugged devices that are easy to operate and can be optionally equipped with a basic or advanced operator panel.
SINAMICS G120C inverters are especially suitable when it comes to meeting the requirements of system integrators, OEMs and distributors regarding high productivity and tailored performance.
SINAMICS G120C is a compact converter for control cabinet mounting in IP20 degree of protection where the Control Unit (CU) and Power Module (PM) function units are combined in one device.
The compact mechanical design and the high power density allow these devices to be installed in machine control enclosures and control cabinets for maximum space utilization. The SINAMICS G120C compact converter can be butt-mounted directly, without derating at temperatures up to 40 °C (104 °F).
SINAMICS G120C, frame size FSAA with BOP-2
SINAMICS G120C can be integrated into the widest range of applications, either using the integrated digital and analog inputs or via the integrated fieldbus interface (available in USS, Modbus RTU, PROFIBUS, PROFINET / EtherNet/IP versions). Especially the product versions with integrated PROFIBUS/PROFINET interface make full integration into the Siemens TIA family possible, therefore allowing the advantages of the seamless TIA product family to be fully utilized. SINAMICS G120C devices are preset in the factory so that they can be immediay connected to PROFIBUS and/or PROFINET fieldbus systems without parameterization.
SINAMICS G120C is also equipped with the safety function STO (Safe Torque Off) as standard, which is used to safely stop drives. As a consequence, machine manufacturers can simply comply with current machinery directives with minimum associated costs.
SINAMICS G120C can control asynchronous (induction) motors in the power range from 0.37 kW up to 132 kW (0.5 hp to 200 hp). Reliable and efficient motor operation is achieved by using state-of-the-art IGBT technology combined with vector control. The extensive range of functions integrated in the SINAMICS G120C also offers a high degree of protection for the converter and motor.
Line-side components
Line reactors
Line reactors smooth the current drawn by the converter and thus reduce harmonic components in the line current. Through the reduction of the current harmonics, the thermal load on the power components in the rectifier and in the DC-link capacitors is reduced as well as the harmonic effects on the supply. The use of a line reactor increases the service life of the converter.
Recommended line-side power components
Standard fuses can be used for the SINAMICS G120C. These must be dimensioned to comply with local regulations. In this chapter, you will find recommended components such as fuses and circuit breakers in compliance with IEC and UL regulations.
DC link components
Braking resistors
Excess energy in the DC link is dissipated in the braking resistor. The braking resistors are designed for use with the SINAMICS G120C. This has an integrated braking chopper (electronic switch).
Load-side power components
Output reactors
Output reactors reduce the rate of voltage rise (dv/dt) and the height of the current peaks, and enable longer motor cables to be connected.
Supplementary system components
Inligent Operator Panel IOP
Graphics-based, user-friendly and powerful operator panel for commissioning and diagnostics as well as local operator control and monitoring of SINAMICS G120C.
Basic Operator Panel BOP-2
A 2-line display to provide support when commissioning and troubleshooting the drive. The drive can be locally controlled.
Memory card
The parameter settings for an inverter can be stored on the SINAMICS SD memory card. When service is required, e.g. after the inverter has been replaced and the data have been downloaded from the memory card the drive system is immediay ready for use again. The associated memory card holder is integrated in the inverter.
PC inverter connection kit 2
For controlling and commissioning an inverter directly from a PC if the STARTER commissioning tool or SINAMICS Startdrive has been installed on the PC.
Spare parts
Shield plates
A set of shield plates is included in the scope of delivery for the motor and signal cables corresponding to the frame size of the SINAMICS G120C, and can also be ordered as spare parts.
Spare parts kit
This kit comprises four I/O terminals, one RS485 terminal, two pairs of Control Unit doors (1 × PN and 1 × other communication versions) and one blanking cover.
Set of connectors
A set of connectors for the line feeder cable, braking resistor and motor cable can be ordered corresponding to the frame size of the SINAMICS G120C inverter.
Roof-mounted fan
A roof-mounted fan (at the top of the device) comprising a pre-assembled unit with holder and fan can be ordered corresponding to the frame size of the SINAMICS G120C.
Fan unit
A replacement fan (at the rear of the device; heat sink) comprising a pre-assembled unit with holder and fan can be ordered corresponding to the frame size of the SINAMICS G120C.
Connection example for SINAMICS G120C
USS/Modbus RTU communication interface
PROFIBUS DP communication interface
PROFINET, EtherNet/IP communication interface
万喜堂app下载体育真人 6SL3210-1KE23-8UP1
西门子产品订货号：6SL32101KE238UP1
西门子产品价格：168 RMB
西门子产品净重： 1.100 Kg
西门子产品承诺：质保一年，原装*
西门子产品尺寸： 270.00 x 225.00 x 85.00
| Control Units | Power Modules degree of protection IP20 | |
|---|---|---|
| PM240‑2/PM240 | PM250 | |
| CU230P‑2 | ✓ | ✓ |
| CU240E‑2 | ✓ | ✓ |
| CU250S‑2 | ✓ | ✓ |
PM240, PM240‑2 and PM250 Power Modules
| Rated power 1) | Rated output current I rated 2) | PM240‑2 Power Modules 3) All CUs pluggable | PM250 All CUs pluggable | |
|---|---|---|---|---|
| kW | hp | A | Article No. | Article No. |
| 200 ... 240 V 1 AC/3 AC | ||||
| 0.55 | 0.75 | 3.2 | 6SL3210-1PB13-0❒L0 | – |
| 0.75 | 1 | 4.2 | 6SL321❒-1PB13-8❒L0 | – |
| 1.1 | 1.5 | 6 | 6SL3210-1PB15-5❒L0 | – |
| 1.5 | 2 | 7.4 | 6SL3210-1PB17-4❒L0 | – |
| 2.2 | 3 | 10.4 | 6SL321❒-1PB21-0❒L0 | – |
| 3 | 4 | 13.6 | 6SL3210-1PB21-4❒L0 | – |
| 4 | 5 | 17.5 | 6SL321❒-1PB21-8❒L0 | – |
| 200 ... 240 V 3 AC | ||||
| 5.5 | 7.5 | 22 | 6SL3210-1PC22-2❒L0 | – |
| 7.5 | 10 | 28 | 6SL3210-1PC22-8❒L0 | – |
| 11 | 15 | 42 | 6SL3210-1PC24-2UL0 | – |
| 15 | 20 | 54 | 6SL3210-1PC25-4UL0 | – |
| 18.5 | 25 | 68 | 6SL3210-1PC26-8UL0 | – |
| 22 | 30 | 80 | 6SL3210-1*-0UL0 | – |
| 30 | 40 | 104 | 6SL3210-1PC31-1UL0 | – |
| 37 | 50 | 130 | 6SL3210-1PC31-3UL0 | – |
| 45 | 60 | 154 | 6SL3210-1PC31-6UL0 | – |
| 55 | 75 | 178 | 6SL3210-1PC31-8UL0 | – |
| 380 ... 480 V 3 AC | ||||
| 0.37 4) | 0.5 | 1.3 | – 4) | – |
| 0.55 | 0.75 | 1.7 | 6SL3210-1PE11-8❒L1 | – |
| 0.75 | 1 | 2.2 | 6SL3210-1PE12-3❒L1 | – |
| 1.1 | 1.5 | 3.1 | 6SL3210-1PE13-2❒L1 | – |
| 1.5 | 2 | 4.1 | 6SL3210-1PE14-3❒L1 | – |
| 2.2 | 3 | 5.9 | 6SL3210-1PE16-1❒L1 | – |
| 3 | 4 | 7.7 | 6SL321❒-1PE18-0❒L1 | – |
| 4 | 5 | 10.2 | 6SL3210-1PE21-1❒L0 | – |
| 5.5 | 7.5 | 13.2 | 6SL3210-1PE21-4❒L0 | – |
| 7.5 | 10 | 18 | 6SL321❒-1PE21-8❒L0 | 6SL3225-0BE25-5AA1 |
| 11 | 15 | 26/25 | 6SL3210-1PE22-7❒L0 | 6SL3225-0BE27-5AA1 |
| 15 | 20 | 32 | 6SL321❒-1PE23-3❒L0 | 6SL3225-0BE31-1AA1 |
| 18.5 | 25 | 38 | 6SL3210-1PE23-8❒L0 | 6SL3225-0BE31-5❒A0 |
| 22 | 30 | 45 | 6SL3210-1PE24-5❒L0 | 6SL3225-0BE31-8❒A0 |
| 30 | 40 | 60 | 6SL3210-1PE26-0❒L0 | 6SL3225-0BE32-2❒A0 |
| 37 | 50 | 75 | 6SL3210-1PE27-5❒L0 | 6SL3225-0BE33-0❒A0 |
| 45 | 60 | 90 | 6SL3210-1PE28-8❒L0 | 6SL3225-0BE33-7❒A0 |
| 55 | 75 | 110 | 6SL3210-1PE31-1❒L0 | 6SL3225-0BE34-5❒A0 |
| 75 | 100 | 145 | 6SL3210-1PE31-5❒L0 | 6SL3225-0BE35-5❒A0 |
| 90 | 125 | 178 | 6SL3210-1PE31-8❒L0 | 6SL3225-0BE37-5❒A0 |
| 110 | 150 | 205 | 6SL3210-1PE32-1❒L0 | – |
| 132 | 200 | 250 | 6SL3210-1PE32-5❒L0 | – |
| 160 3) | 250 | 302 | 6SL3224-0XE41-3UA0 | – |
| 200 3) | 300 | 370 | 6SL3224-0XE41-6UA0 | – |
| 250 3) | 400 | 477 | 6SL3224-0XE42-0UA0 | – |
| 500 ... 690 V 3 AC | ||||
| 11 | 10 | 14 | 6SL3210-1PH21-4❒L0 | – |
| 15 | 15 | 19 | 6SL3210-1PH22-0❒L0 | – |
| 18.5 | 20 | 23 | 6SL3210-1PH22-3❒L0 | – |
| 22 | 25 | 27 | 6SL3210-1PH22-7❒L0 | – |
| 30 | 30 | 35 | 6SL3210-1PH23-5❒L0 | – |
| 37 | 40 | 42 | 6SL3210-1PH24-2❒L0 | – |
| 45 | 50 | 52 | 6SL3210-1PH25-2❒L0 | – |
| 55 | 60 | 62 | 6SL3210-1PH26-2❒L0 | – |
| 75 | 75 | 80 | 6SL3210-1PH28-0❒L0 | – |
| 90 | 100 | 100 | 6SL3210-1PH31-0❒L0 | – |
| 110 | 100 | 115 | 6SL3210-1PH31-2❒L0 | – |
| 132 | 125 | 142 | 6SL3210-1PH31-4❒L0 | – |
| Heat sink variant | ↑ | |||
| Standard | 0 | |||
| Push Through | 1 | |||
| Integrated line filter | ↑ | ↑ | ||
| Without | (for IT systems) | U | U | |
| Class A | (for TN systems) | A | A | |
| Class B | (for TN systems) | – | Integrated line filter not available, as external option only | |
西门子产品订货号：6SL32101KE238UP1
西门子产品价格：168 RMB
西门子产品净重： 1.100 Kg
西门子产品承诺：质保一年，原装*
西门子产品尺寸： 270.00 x 225.00 x 85.00
关键词：PLC、自来水、净水剂、PID
Abstract
Because big control hysteresis and complicated ponderance of PAC in the technique of tap water, the conventional control ——PID is not really realization auto control the quantity of PAC. This paper analyzes the emphases and difficulty of the system of add PAC to the waterworks, then put the axe in the helve. In the end, introduce a new application of SIEMENS S7-200 in the system of add PAC to the waterworks.
Key Words: PLC, Tap water, PAC, PID
一、 项目简介
南宁市某铁路自来水厂担负着供应南宁铁路系统列车自来水供应、铁路职工用水等重要的任务。对水质要求较高，且对用水的持续性要求也非常的严格，必须保证24小时不间断的供水。由于原建的水厂由于建厂时间较早，自动化程度不高；尤其是净水剂的投加系统采用人工投加方式，无法保证出水浊度的稳定等要求。因此决定对全厂自动化系统进行升级和改造。
经过铁路水电段对PLC组网性能、维护方便、相对投资等多个方面性能指标的对比，zui终决定在本项目中自动化控制部分采用西门子S7—300系列PLC作为主控PLC，在沉淀池、滤池等部分采用S7-200系统PLC作为智能从站。一方面保证了网络性能（通讯速度采用500K），另外S7-200可以在通讯网络断开等故障情况下能够独立运行等特点也保证了系统运行的可靠性。
二、 系统介绍
1、项目工艺
在自来水厂中，源水要经过投加净水剂、沉淀、过滤、消毒然后进入清水池。对源水投加净水剂后，水中杂质便絮凝成矾花，此时才能进行进一步水质净化处理，因此净水剂投加工艺是影响出厂水质量的要因。同时净水剂的投加直接影响到沉淀池的使用效率和滤池反冲用水量的大小，对消毒也有直接的影响。因此投加净水剂是自来水厂中工艺要求比较高的一个环节。
2、控制器组成
项目中使用的PLC、模块、控制对象等如下：
|
| 名称 | 技术参数/控制对象 | 型号 | 生产厂家 | 数量 | 单位 | 备注 |
| 使用模块 | CPU | 24 入/16 出 | 6ES7 216-2BD23-0XB0 | 西门子 | 1 | 个 |
|
| AI模块 | 模拟量输入模块 4输入 | 6ES7 231-0HC22-0XA0 | 西门子 | 3 | 个 |
| |
| AO模块 | 模拟量输出模块 2输 | 6ES7 232-0HB22-0XA0 | 西门子 | 2 | 个 |
| |
| 通讯模块 | EM277 PROFIBUS-DP模块 | 6ES7 277-0AA22-0XA0 | 西门子 | 1 | 个 |
| |
| 控制对象 | 变频器 | 1.5KW | 6SE6 440-2UD21-5AA0 | 西门子 | 2 | 台 |
|
| 计量泵 | 1.5KW |
| ALLDOS | 2 | 台 |
|
三、 控制系统构成
本系统中一共有模拟量输入9个：源水浊度、源水流量（2个）、游动电泳仪、沉淀池浊度、计量泵开度（2个）、变频器电流（2个）。模拟量输出4个：1#、2#变频器频率、1#、2#计量泵开度。开关量输入6个：1#、2#变频器手/自动，1#、2#变频器运行，1#、2#变频器故障。开关量输出3个：1#、2#变频器运行，故障报警。联网功能采用EM277和系统中CPU315-2DP连接。
一共采用：CPU226 一个，模拟量输入模块EM231（4路）3个，模拟量输出模块EM232（2路）2个，DP通讯模块EM277 一个。
注：游动电泳仪可以测量水中可以结合杂质的游离电子的数目，而游离电子数目必须保持在一定范围，如果测量值偏大则说明投加净水剂过多影响混凝效果，反之说明投加量不够导致混凝不充分。计量单位为SCD。
四、 控制系统完成的功能
1、控制要求
原系统的净水剂投加过程采用手动投加方式，这就直接影响到出厂水的浊度，同时也会产生投加量过度的问题。经过询问现场人员、实际调查总结了以下主要原因
a、净水剂投加设备落后：当源水浊度发生改变时无法及时调整提高投加量；
b、净水剂投加由人为掌握：投加量靠经验投加；
c、净水剂配制无标准：药剂浓度由配置人员靠经验配置，而浓度不准使投加量更加难以掌握；
d、投加量计算困难：操作人员水平差异较大，投加量随意性比较大；
以上种种原因造成投加量不准确，从而影响到絮凝效果、并直接导致出厂水水质下降。
系统改造要求：
水厂更换新的自动化投加系统，新系统可根据水质变化情况随时调整投药量，将沉淀池出水均在8NTU（NTU为浊度计量单位）以下，出厂水在1NTU以下；经防疫站检测：出厂水浊度达标率必须为*。并可在控制系统中加入参数调节和监控功能。
2、控制难点及控制方法实现
根据对工艺过程的分析，本系统属于典型的大滞后系统。考虑到一般的PID算法对于滞后时间长的系统难以实现控制目标，而模糊控制等高级算法实现成本较高等原因。决定在系统中采用经验值投加和PID算法相结合的办法，既解决了PID算法的不足，又解决了成本问题。
整个系统软件中主要包括以下几个主要方面：
a、PID算法：定时采集沉淀池浊度，应用S7-200内置的PID进行运算。得到的模拟输出值为X。
b、经验值：对应一定流量的经验投加量进行运算——采用查表法查找对应的经验值，得出相应流量的投加量为Y。
c、按照 得出PID运算和经验投加之和。用Z直接控制计量泵开度。（其中a可以在一段时间运行后进行修改以达到*化控制。）
d、将原水浊度按照经验值，SCD按照PID算法进行入2、3进行运算，并将运算结果控制变频器频率以保证游动电泳仪测量值在设定值左右。
e、按照设定运行时间转换变频器和计量泵以便设备轮换使用。
f、报警功能：按照要求将有关故障均进行现场蜂鸣报警，并上传至CPU315-2DP中以便中控室进行记录和处理。
程序分为以下几个部分：
| 序号 | 程序块 | 程序名 | 功能 | 备注 |
| 1 | OB1 | Main | 主程序 |
|
| 2 | SBR0 | movedpdata | 通过EM277发送数据，以便上位机监控 |
|
| 3 | SBR1 | PID_NTU | 浊度PID计算 | 向导生成 |
| 4 | SBR2 | PID_SCD | 游动电泳仪PID计算 | 向导生成 |
| 5 | SBR3 | rtoi | 模拟量输出转换 |
|
| 6 | SBR4 | i4tr | 模拟量输入转换 |
|
| 7 | SBR5 | err | 故障判断 |
|
| 8 | INT1 | PID_EXE | PID中断 | 向导生成 |
其中主程序和注释代码如下：
| 块：MAIN | ||||
| 内部变量 | 符号 | 变量类型 | 数据类型 | 注释 |
| tr0 | TEMP | REAL | LD0 | |
| tr1 | TEMP | REAL | LD4 | |
| ti1 | TEMP | INT | LW8 | |
| tdi | TEMP | DINT | LD10 | |
| tkr | TEMP | REAL | LD14 | |
| tki | TEMP | INT | LW18 | |
| 网络 1 调用子程序发送数据到315-2DP LD SM0.0 CALL movedpdata:SBR0 | 网络 2 将PID部分和流量比例部分相加 得出计量泵开度控制量 LD SM0.0 MOVW #ti1:LW8, outkd:VW2004 +I #tki:LW18, outkd:VW2004 | |||
| 网络 3 将流量相加，乘上相应的系数并乘0.4 LD SM0.0 CALL i4tr:SBR4, ll1:AIW6, 2000.0, #tr0:LD0 CALL i4tr:SBR4, ll2:AIW8, 2000.0, #tr1:LD4 +R #tr0:LD0, #tr1:LD4 *R setllk:VD1004, #tr1:LD4 *R 0.4, #tr1:LD4 CALL rtoi:SBR3, #tr1:LD4, 4000.0, #ti1:LW8 | 网络 4 进行PID运算并乘上比例系数0.6 LD SM0.0 CALL PID_NTU:SBR1, ntu_cdc:AIW2, setndt:VD1000, zjkd:VW2000 ITD zjkd:VW2000, #tdi:LD10 DTR #tdi:LD10, #tkr:LD14 *R 0.6, #tkr:LD14 ROUND #tkr:LD14, #tdi:LD10 DTI #tdi:LD10, #tki:LW18 | |||
| 网络 5 由SCD计算PID 乘上系数0.8 LD SM0.0 CALL PID_SCD:SBR2, scd:AIW4, setscd:VD1008, zjhz:VW2002 ITD zjhz:VW2002, #tdi:LD10 DTR #tdi:LD10, #tkr:LD14 *R 0.8, #tkr:LD14 ROUND #tkr:LD14, #tdi:LD10 DTI #tdi:LD10, #tki:LW18 | 网络 6 由源水浊度乘系数 并乘0.2 LD SM0.0 CALL i4tr:SBR4, ntu_yuanshui:AIW18, 1000.0, #tr0:LD0 *R seuk:VD1012, #tr0:LD0 *R 0.2, #tr0:LD0 ROUND #tr0:LD0, #tdi:LD10 DTI #tdi:LD10, #ti1:LW8 | |||
| 网络 7 将PID部分和源水浊度比例部分相加 得出频率控制量 LD SM0.0 MOVW #ti1:LW8, outhz:VW2006 +I #tki:LW18, outhz:VW2006 | 网络 8 计算一号泵开机运行累计时间 LD T37 EU INCW ljtime1:VW2008 | |||
| 网络 9 停机时清空上次运行时间 LD run1:I0.2 LPS AN T37 TON T37, +600 LPP NOT MOVW +0, ljtime1:VW2008 | 网络 10 计算二号泵开机运行累计时间 LD T38 EU INCW ljtime2:VW2010 | |||
| 网络 11 停机时清空上次运行时间 LD run2:I0.3 LPS AN T38 TON T38, +600 LPP NOT MOVW +0, ljtime2:VW2010 | 网络 12 将设定时间转换为分钟 LD SM0.0 MOVW settime:VW1016, timem:VW2012 *I +60, timem:VW2012 | |||
| 网络 13 一号机运行时间到 LDW>= ljtime1:VW2008, timem:VW2012 EU S go1:M0.0, 1 | 网络 14 二号机运行时间到 LDW>= ljtime2:VW2010, timem:VW2012 EU S go2:M0.1, 1 | |||
| 网络 15 开一号变频器和计量泵 LD go2:M0.1 ON auto2:I0.1 LD qr1:Q0.0 LDN go1:M0.0 LD go1:M0.0 AN auto2:I0.1 OLD ALD OLD AN err_1:M10.0 A auto1:I0.0 = qr1:Q0.0 MOVW outhz:VW2006, o_hz1:AQW4 MOVW outkd:VW2004, o_kd1:AQW0 | 网络 16 开二号变频器和计量泵 LD go1:M0.0 ON auto1:I0.0 LD qr2:Q0.1 LDN go2:M0.1 LD go2:M0.1 AN auto1:I0.0 OLD ALD OLD AN err_2:M10.1 A auto2:I0.1 = qr2:Q0.1 MOVW outhz:VW2006, o_hz2:AQW6 MOVW outkd:VW2004, o_kd2:AQW2 | |||
| 网络 17 调用错误判断子程序 LD SM0.0 CALL err:SBR5 | 网络 18 出错报警（蜂鸣频率为1Hz） LD SM0.5 LD err_2:M10.1 O err_1:M10.0 ALD = bee:Q0.3 | |||
限于篇幅，其他几个子程序及I/O表等均省略。
五、 结束语
采用新的净水剂投加系统后，出厂水浊度由过去的3NTU以内降到了1NTU以下，在防疫部门多次检测中达标率达到了*；净水剂的投加达到了*投加量，避免了净水剂的浪费。经过统计，去年4~11月净水剂使用量比往年同期平均使用量减少了约15000Kg。同时由于沉淀池出水浊度的下降，滤池反冲周期延长了近12小时，使生产自用水量降低了约1.5%，累计比去年同期减少了约2.5万吨。按净水剂2.205元/Kg，水0.45元/吨计算，可节省供水成本：15000×2.205＋2500×0.45=44325元。
经过三年的使用过程证明：采用浊度控制计量泵开度、SCD控制变频器频率的方法不仅可以让投加量更加精确，还可以更加方便的控制投加量以达到在源水浊度低的季节中节省净水剂的效果。
六、 应用体会
该系统控制对象为出厂水浊度，但是SCD值也是一个很重要的中间对象，要求较高的控制精度，并且控制对象滞后时间很大。要在这样的情况下完成这样的控制要求，不仅要求PLC的功能要强大，还需要设计人员进行比较复杂的编程处理，而且对PLC的模拟量处理功能要求也比较高；另外在达到系统要求功能的前提下也要求尽量降低系统的成本。尤其是程序中的查表子程序，本身就需要占用很大的程序空间以及数据存储空间。
而S7-200系列中CPU226在程序存储、数据存储、扫描时间等各个方面都能满足系统的要求。而S7-200系列的EM277模块使得和原系统中S7-300连接更加简单方便，从而也节省了大量编程时间和程序空间。
本系统投入使用后效果非常明显，系统运行稳定有效，尤其是S7-200PLC 的出色表现得到用户和专家的*好评。
万喜堂彩票最新网址
请输入计算结果（填写阿拉伯数字），如：三加四=7 
万喜堂彩票最新网址
