Can be divided into mainframes, medium-sized machines and minicomputers.
Minicomputer: The control point of the minicomputer is generally within 256 points, which is suitable for single-machine control or small system control.
The Siemens minicomputer has S7-200: processing speed 0.8~1.2ms; memory 2k; digital 248 points; analog 35 channels.
Medium-sized machine: The control point of the medium-sized machine is generally no more than 2048 points. It can be used for direct control of the equipment. It can also monitor multiple lower-level programmable controllers. It is suitable for medium or large control systems.
Siemens medium-sized machines have S7-300: processing speed 0.8~1.2ms; memory 2k; digital 1024 points; analog 128 channels; network PROFIBUS; industrial Ethernet; MPI.
Mainframe: The control point of the mainframe is generally greater than 2048 points, which not only can complete more complicated arithmetic operations.
Control mode
System Settings Remote / Local / Manual button:
Remote: The system can only be automatically started/stopped by the host computer. The local device has priority control. In the program control, the device can be soft-operated/automatically switched by the host computer, and the soft-handed operation starts/stops.
Local: The system can only be automatically started/stopped through the touch screen. The local device has priority control. In the program control, the device can be soft-operated/automatically switched through the touch screen, and the soft-handed operation starts/stops.
Manual: When the manual control is performed, the host computer/touch screen fails, and the start/stop of the device can only be controlled manually.
Single device control
A single device must have soft hands/automatic switching and soft start/stop functions. When switching from automatic to soft hands, the device cannot be stopped. When switching from soft hands to automatic, the device starts/stops depending on Automatic program.
Single device
(Pumps, fans and other large equipment) must be rotated after 24 hours of operation, and must have accumulated running time. If the start/stop sequence is set by the upper computer, the operator will set it himself.
Unified program structure
OB1: main program
OB100: Initialization procedure (no main program call required)
OB35: 100ms (modifiable) interrupt (no main program call required), you can call the PID module;
OB80, OB82, OB85, OB86, OB87, OB121, OB122: Fault diagnostics module (no main program call required, no programming required)
FC1: System mode FC2: Input processing
FC3: Output processing FC4: Run processing
FC5: Stop processing FC6: Hand automatic switching
FC100: Used to create some subroutines that can be called cyclically
FC105: The system comes with an analog input subroutine (can be called cyclically)
FC106: The system comes with an analog output subroutine (can be called cyclically)
Modbus communication (CP341): FB7: P_RCV_RK, FB8: P_SND_RK
Communication CP340: FB2: P_RCV, FB3: P_SND
General PID: use FB41
Temperature and humidity PID: use FB58
If the block is duplicated with the system block, please avoid it.
data block
DB1: AI data, type: REAL, interface with the host computer
DB2: AO data, type: REAL, interface with the host computer
DB3: DI data, type: BOOL, interface with the host computer
DB4: DO data, type: BOOL, interface with the host computer
DB5: device running time and traffic accumulation, type: REAL, interface with the host computer;
DB6: alarm message, type: BOOL, interface with the host computer
DB7: Type: REAL, intermediate register
DB8: Type: INT, intermediate register
DB9: Type: WORD, intermediate register
DB10: Type: BOOL, intermediate register
DB11: Used later for communication with devices, such as MODBUS communication, etc.
DB100: used as background data block when calling FB block
M area: also as an intermediate variable
DP slave fault diagnosis
The DP slave must do fault diagnosis, fault alarm, and use FB125.
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