Description
Technical Specifications
- Rated Supply Voltage: 24 VDC
- Internal Bit Memory: 128 Byte
- Timer Quantity: 256 timers
- Counter Quantity: 256 counters
- Integrated DI/DO: 8 digital inputs / 8 digital outputs
- Working Temperature: 0 °C ~ +60 °C (horizontal installation); 0 °C ~ +45 °C (vertical installation)
- Storage Temperature: -20 °C ~ +70 °C
- MPI Communication Interface: Maximum communication rate 187.5 kbit/s
Functional Features
- Complete logic control, timing, counting, data processing and arithmetic operation functions
- Integrated digital I/O channels, no need for additional expansion modules for simple control
- Support MPI multi-point interface communication, realize data exchange between multiple PLCs and HMI
- Program online download, upload, monitoring and diagnosis
- Built-in system self-diagnosis function, real-time monitoring module operating status
- Support multiple programming languages compliant with IEC 61131-3
Performance Parameters
- Binary Instruction Execution Speed: 0.7 μs per instruction
- Floating-point Instruction Execution Speed: 7 μs per instruction
- Input Signal Delay: ≤ 0.2 ms
- Output Signal Response Time: ≤ 0.3 ms
- Insulation Voltage: 500 VAC (between circuit and shell)
- Maximum Expansion Modules: Cooperate with S7-300 rack to expand multiple signal modules
Material Composition
- Shell: Reinforced flame-retardant ABS plastic
- Main control board: High-precision industrial multilayer PCB
- Terminal part: PA66 flame-retardant plastic + brass terminal pins
- Core device: Siemens dedicated industrial CPU chip, storage chip, signal driving chip
Structural Characteristics
- Standard DIN rail mounting structure for S7-300 series
- Upper part with mode selector switch, status LED indicators
- Lower part with integrated I/O terminal block
- Backplane connector for connecting S7-300 backplane bus
- Modular splicing structure, can be combined with various expansion modules
Working Principle
After the power is on, the CPU executes the user program cyclically according to the scan cycle: first reads the state of on-site input signals, then executes logic, arithmetic and control programs, finally outputs control signals to on-site actuators. Meanwhile, it completes data interaction with man-machine interface, other PLCs and upper computer through the communication interface, and runs self-diagnosis programs to ensure system normal operation.
Advantage Highlights
- Integrated I/O design, reduce overall equipment cost and cabinet space
- Fast instruction execution, stable control performance
- Rich communication functions, convenient for system networking
- Excellent compatibility with all S7-300 series expansion modules
- Industrial-grade reliability, adapt to long-term continuous operation on site
Applicable Industries
Machinery manufacturing, automobile production line, packaging machinery, textile machinery, food processing, logistics equipment, small and medium-sized automatic assembly lines
Model Series
Siemens SIMATIC S7-300 CPU Series
Installation Requirements
- Install on standard 35 mm DIN mounting rail
- Horizontal installation ambient temperature not exceeding 60 °C, vertical installation not exceeding 45 °C
- Keep 20 mm or above ventilation gap around the module
- Power supply wiring use twisted pair, separate power line and signal line
Usage Notes
- Switch the mode switch only when the program is stopped
- Avoid frequent power on and off of the equipment
- Use shielded cables for communication lines and do not lay together with power cables
- Regularly clean dust on the surface and heat dissipation gap
- Do not modify internal hardware structure without authorization
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