SIEMENS SIMATIC S7-300 Automation System

SIEMENS SIMATIC S7-300

Overview

  • The modular mini PLC system for the low and mid-performance ranges
  • With comprehensive range of modules for optimum adaptation to the automation task
  • Flexible use through simple implementation of distributed structures and versatile networking
  • User-friendly handling and uncomplicated design without a fan
  • Can be expanded without problems when the tasks increase
  • Powerful thanks to a range of integrated functions

Application areas of the SIMATIC S7-300 include:

  • Special machinery,
  • Textile machinery,
  • Packaging machinery,
  • General mechanical equipment manufacture,
  • Controller building,
  • Machine tool manufacture,
  • Installation systems,
  • Electrical/electronics industry and the skilled trades.

Siemens S7 300 Diagnostics

SIEMENS SIMATIC S7-300

Digital input/output modules

Diagnostics message

Possible fault cause

No sensor supply

  • Sensor supply overload
  • Short-circuit of the sensor supply to M

No external auxiliary voltage

  • No supply voltage L+ of the module

No internal auxiliary voltage

  • No supply voltage L+ of the module
  • Internal module fuse defective

Fuse blown

  • Internal module fuse defective

Incorrect parameters in module

  • Incorrect parameters transferred to module

Time monitoring addressed (watchdog)

  • Periodically high electromagnetic interference
  • Module defective

EPROM fault

  • Periodically high electromagnetic interference
  • Module defective

RAM fault

  • Periodically high electromagnetic interference
  • Module defective

Hardware interrupt lost

  • Hardware interrupts come faster than the CPU can process them

Analog input modules

Diagnostics message

Possible fault cause

No external load voltage

  • No load voltage L+ of the module

Configuring/parameterization errors

  • Incorrect parameters transferred to module

Common mode error

  • Difference in potential UCM between the inputs (M-) and reference potential of the measuring circuit (MANA) too high

Wirebreak

  • Resistance of sensor circuit too high
  • Interruption of the line between the module and the sensor
  • Channel not switched (open)

Measuring range low limit violated

  • Input value lower than the underrange, fault possibly caused by
    • Measuring range 4 to 20 mA, 1 to 5 V:
      sensor connected with reverse polarity;
      wrong measuring range selected
    • Other measuring ranges:
      wrong measuring range selected

Measuring range high limit violated

  • Input value exceeds overrange

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