PFEA113-20
在线调试过程中，系统在监控状态下运行，可随时发现问题、随时解决问题，从而使系统逐步完善。因此，一般系统所存在的问题基本上可在此过程中得到解决。在线调试设备开停时，必须先调试空开关的运行情况；如果设备设有运行监视开关，则可把监视开关强制为”１”(正式运行时，撤销强制)。调试单台设备时可针对性地建立该设备的变量表，对该设备及其与该设备相关的变量进行实时监视。这样既可判断逻辑操作是否正确，对模拟量的变化也可一目了然。
PFEA113-20
比如调试电动执行器时，可建立一变量表，对执行器的位置信号、限位信号、过力矩信号及输出命令信号等进行实时监视，便可非常直观地观测执行器的动作情况。S7-300 PLC模拟量模块可通过变换信号类型卡支持各种类型信号。当改造老生产工艺线时，不可避免地会遇到多类信号。因此，设计时最好不把几种信号接到同一模块；同时必须先组态好模块，再接信号线，检查无误后送电。此外，应避免两线制与四线制信号、电流与电压信号的混接，以免烧坏模块。一般变送器的负载能力为600Ω，而模拟量输入模块的抗阻各不相同(一般在250Ω以下)。如果回路内设安全栏，必 须注意抗阻的匹配；模拟量输出模块的负载能力为600Ω，一般 执行器的负载能力为250Ω；如线路较长，也存在抗阻匹配问题。
PFEA113-20
Before powering on, PFEA113-20 should patiently and meticulously perform a series of routine checks (including wiring checks, insulation checks, grounding resistance checks, insurance checks, etc.) to avoid damaging the PLC module (check all modules using the STEP7 diagnostic program).System debugging. System debugging can be carried out in two stages: offline debugging and online debugging. Offline debugging mainly involves checking and debugging the programming work. STEP7 can automatically diagnose and process user programming, and users can also judge the correctness of programming through various logical relationships. Online debugging is a comprehensive debugging process that includes debugging the program itself, peripheral circuits, peripheral devices, and controlled devices. In addition, it is necessary to strengthen signal isolation, especially between small PLCs supporting branch speed control devices, variable frequency speed control devices, and equipment, to prevent mutual interference.
PFEA113-20
During the online debugging process, the system runs in a monitoring state, allowing problems to be discovered and resolved at any time, thus gradually improving the system. Therefore, the problems that exist in general systems can basically be solved in this process. When online debugging equipment on/off, it is necessary to first debug the operation of the empty switch; If the equipment is equipped with an operation monitoring switch, the monitoring switch can be forced to “1” (during formal operation, the force can be revoked). When debugging a single device, a targeted variable table can be established to monitor the device and its related variables in real-time. This not only determines whether the logical operation is correct, but also allows for a clear understanding of changes in analog quantities.
PFEA113-20
For example, when debugging an electric actuator, a variable table can be established to monitor the position signal, limit signal, over torque signal, and output command signal of the actuator in real-time, allowing for a very intuitive observation of the actuator’s action. The S7-300 PLC analog module can support various types of signals by changing the signal type card. When renovating old production process lines, it is inevitable to encounter multiple types of signals. Therefore, it is better not to connect several signals to the same module during design; At the same time, the module must be configured first, and then the signal line must be connected. After checking for errors, power can be transmitted. In addition, mixing of two wire and four wire signals, as well as current and voltage signals, should be avoided to avoid burning out the module. The load capacity of a general transmitter is 600 Ω, while the impedance of analog input modules varies (usually below 250 Ω). If safety barriers are installed in the circuit, attention must be paid to the matching of resistance; The load capacity of the analog output module is 600 Ω, and the load capacity of the general actuator is 250 Ω; If the line is long, there may also be impedance matching issues.
There are no reviews yet.