SIMATIC S7-300 Communication modules-PLCs – Siemens

S7-300 Communication modules processors are used for connecting S7-300 to the different bus systems /Image result for S7-300 Communication modules communication networks as well for point-to- point link. According to application case and module different protocols and different bus systems are available like PROFIBUS DP or Industrial Ethernet.

Communication for SIMATIC S7-300

CP 342-5

for connecting S7-300, the modular controller for innovative solutions in the manufacturing industry, to PROFIBUS
  • Expansion of the process I/O of SIMATIC S7-300 using several PROFIBUS interfaces
  • Use in the field as DP-V0 master or DP-V0 slave
  • Use in the cell area with cross-network programming device/operator panel communication through S7 routing
  • Extensive operator control and monitoring thanks to multiplex function with OP communication
  • Flexible use of the process I/O by means of dynamic activation of DP slaves

CP 342-5 FO

Fiber-optic technology is used when

  • the environment is severely affected by electromagnetic interference,
  • extreme potential differences exist and
  • high transmission rates are required.

Image result for S7-300 Communication modules

SIMATIC S7-300 Communication modules-PLCs – Siemens


Communication modules allow connection of the SIMATIC S7-300 for instance to:

  • SIMATIC S7 and SIMATIC S5 programmable controllers, and systems from many other manufacturers
  • PCs, programming devices, hmi devices
  • Field devices
  • Printers
  • Robot controls
  • Modems
  • Scanners, bar code readers, etc.


• Reduced start-up times due to the easy configuration with STEP 7
• Reduced downtimes and service times in the event of a fault through LED displays

Design and function

The CPs have a rugged plastic housing with LEDs for displaying operating states and faults.
They show all advantages of the SIMATIC S7-300- Design, e.g.
• Compact design
• Easy installation
• User friendly wiring, etc.

Siemens S7 300 Diagnostics

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

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