All posts by: a74

1. Some foreign small PLC program structure The PLC user program by the main program, subroutine and interrupt program. The CPU should call the main program every scan cycle. The main program can call the subroutine, the small control system can only the main program. Interrupt program for quick response to interrupt events. When an […]

An operation is to use the Siemens MP277 touch screen machine, the system is set password! Want to re-enter the program, but the transmission has been changed, pass not go in, want to go in to modify the transmission but can not get in, I do not know if there is no universal password? Or […]

Siemens industrial software is divided into three different categories: (1) Programming and Engineering Tools Programming and Engineering Tools include all the tools needed for PLC, PC-based control of programming, configuration, simulation and maintenance. STEP 7 Standard Package SIMATIC S7 is a project management tool for programming and maintaining the configuration of PC-based control products for […]

Q: Siemens touch screen crashes, how point is useless, restart and normal power off, I do not know what is the reason? A: 1, crashes for two reasons: software or hardware. First rule out the software, you can use the software to restore the factory settings. The same thing happens if you can not set […]

First, set, rotor core troubleshooting, the rotor is stacked from each other insulated silicon steel is the magnetic circuit part of the motor. Set, the main reason for the rotor core failure are the following. ① bearing a long time, excessive wear and tear, resulting in stator and rotor phase friction, so that the core […]

We often say inverter control motor equipment, but specifically how how to control it? In fact, the inverter control of the motor, mainly based on the motor characteristics of the parameters and motor operation requirements, the motor voltage, current, frequency control to achieve the load requirements. Frequency inverter motor control common four main are: U […]