A field terminal is a disposable unit used to let go of field wiring and link it directly to the I/O module. Any essential field device power is given via the module to the field terminals, so no additional patching is necessary. The modules have elective field terminal types, not only to get the most out but also to sustain security, by stopping the wrong type of module from being connected to the field devices. Other key benefits include:

  • Fuses or loop-disconnects for safety
  • Machine-driven keying for precise module identification
  • Blue field terminals to categorize IS field wiring
  • Tagging strip for right identification of field device wiring
  • Built-in cold junctions for field thermocouples


 Input/Output Module  Overview


All I/O modules are classified among one of four likely categories; discrete, register, analog, or intelligent modules.

Discrete input modules provide numerous points of info to the PLC that must be either ON or OFF.  Discrete output modules obtain signals from the manager and turn field devices either ON or OFF.


Register input modules are  modules which are utilized in order to  select, convert, and  condition BCD  or  binary data  (16  bit words) that  goes between an  input field device and  the  PLC.  Register output modules deliver lTL  or CMOS  compatible signals (16  Bit words), in also  BCD  or binary format, to  output field devices.


Analog input modules obtain a voltage or current from a field device later on it executes an analog to digital conversion.  It then offers the digital results (16 bit words) to the  PLC.  Analog output modules receive digital data (16-bit words) from the PLC, perform a digital to voltage or current conversion.  It then presents the analog result to field devices.


Intelligent modules can be referred to as’ modules with built-in microprocessors that  implement functions which might otherwise need use of the  PLC’s main memory, and Central  Processing Unit.


I/O  Terminal  Connectors


Field wiring is connected to the I/O module with the help of the terminal block. Furthermost terminal blocks are linked to the l/O housing, not the modules. In case it becomes needed to substitute an I/O module, the module glides out from the l/O housing while the terminal block continues to be attached to the housing.  This lets you rapidly and effortlessly swap I/O modules, without disrupting field wiring.  Series analog l/O modules use a terminal block that plug into the I/O module, not the housing.  In this specific case, you must unplug the terminal block from the module before you convert the module.  The field wiring continues with the connector and is not disturbed with this system.


Prismecs offers a range of Terminal connectors and modules. For further information contact us now.

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