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CIMON Communication Driver

CIMON Communication Driver is intended for data connection between Reliance's runtime software and CIMON control systems through the CIMON PLC Ethernet network.


Communication between the driver and devices is based on the request-response principle. The driver is launched by Reliance's runtime software at visualization project startup.



Supported communication functions

  • Word Block Read
  • Word Block Write
  • Bit Block Read
  • Bit Block Write


Supported register types

X, Y, M, K, L, F, T, C, S, D, Z, TC, TS, CC, CS



The Reliance system supports reading and writing the following tag types

  • Bool
  • Byte
  • Word
  • DoubleWord
  • ShortInt
  • SmallInt
  • LongInt
  • FLoat
  • String
  • And arrays of these basic types


CIMON programmable logic controllers

CIMON programmable logic controllers


Starting up the driver

The communication driver is a DLL loaded into memory by the Reliance 4 Driver Server program, which can be launched either as a Windows service at Windows startup or as a standard application at the start of a visualization project. Information required to make a connection with devices is read from the visualization project. After reading this information, communication to all connected devices is activated.



Reading/writing data

Data is read periodically or based on a one-shot request of Reliance’s runtime software. When reading periodically, the tag value is updated at a configured interval. One-shot reading is used for tag-controlled data reading. Communication packets are built dynamically according to data quantity requirements. Data writing is based on a one-shot request of the runtime software.


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