seajack的ASP.Net学习笔记

2. PROGRAMMABLE LOGIC CONTROLLERSTopics:PLC HistoryLadder Logic and RelaysPLC ProgrammingPLC OperationAn ExampleObjectives:Know general PLC issuesTo be able to write simple ladde

3.4 A CASE STUDY3.4个案研究(Try the following case without looking at the solution in Figure 3.8.) An electrical layout is needed for a hydraulic press. The press uses a 24Vdc double actuated soleno

3.3RELAYS3.3继电器Although relays are rarely used for control logic, they are still essential for switching large power loads. Some important terminology for relays is given below.虽然继电器很少为逻辑控制使

3.2.2 Output Modules3.2.2输出模块WARNING - ALWAYS CHECK RATED VOLTAGES AND CURRENTS FOR PLC’s AND NEVER EXCEED!警告-经常检查PLC的额定电压和电流绝不能超过！正如输入模块，输出模块很少提供任何电力，而是作为开关。外部电源连接到输出卡，输出卡将为每个输出切换电源开或关。典型的输

 3.2.1 Inputs3.2.1 输入    In smaller PLCs the inputs are normally built in and are specified when purchasing the PLC. For larger PLCs the inputs are purchased as modules, or cards, with 8 or 16

Sinking and Sourcing Concepts漏和源的概念When choosing the type of input or output module for your system (or DL05/DL06/DL105 I/O type), it is very important to have a solid understanding of sinking a

3.2 INPUTS AND OUTPUTS3.2输入和输出Inputs to, and outputs from, a PLC are necessary to monitor and control a process. Both inputs and outputs can be categorized into two basic types: logical or conti

 3. PLC HARDWARE3、 PLC硬件Topics:l         PLC hardware configurationsl         Input and outputs typesl         Electrical wiring for inputs and outputsl         Relaysl         Elect

2.2 A CASE STUDY2.2案例研究     Problem: Try to develop (without looking at the solution) a relay based controller that will allow three switches in a room to control a single light.      问题：尝试开发一个（

2.1.5 Ladder Logic Outputs2.1.5梯形逻辑输出     In ladder logic there are multiple types of outputs, but these are not consistently available on all PLCs. Some of the outputs will be externally connecte

2.1.4 Ladder Logic Inputs2.1.4梯形逻辑输入     PLC inputs are easily represented in ladder logic. In Figure 2.11 there are three types of inputs shown. The first two are normally open and normally close

2.1.3 PLC Connections2.1.3 PLC的连接     When a process is controlled by a PLC it uses inputs from sensors to make decisions and update outputs to drive actuators, as shown in Figure 2.9. The process

2.1.2 Programming2.1.2编程        The first PLCs were programmed with a technique that was based on relay logic wiring schematics. This eliminated the need to teach the electricians, technicians and

2.1.1 Ladder Logic2.1.1梯形逻辑     Ladder logic is the main programming method used for PLCs. As mentioned before, ladder logic has been developed to mimic relay logic. The decision to use the relay

2.1 INTRODUCTION2.1简介Control engineering has evolved over time. In the past humans were the main method for controlling a system. More recently electricity has been used for control and early electr

3.5 ELECTRICAL WIRING DIAGRAMS3.5电气接线图When a controls cabinet is designed and constructed ladder diagrams are used to document the wiring. A basic wiring diagram is shown in Figure 3.9. In this