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RS485 Modules ModBus
  M4E/4SD
  M4E/4SA
  M8ED
  M8SD
  M8EA
  M8SA
  M24EDL
  M24SDL
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  ETH 8SD
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RS485 Modules ModBus

These modules implement the ModBus RTU protocol. This protocol has a longer response time than compact modules, but have the advantage that can be integrated into ModBus facilities, either to use existing software or combine with modules from other manufacturers.

On request we can build customized ModBus modules

Additional information: 

M4E/4SD 
4 digital input/4 digital output ModBus módule

This module has 4 digital inputs and 4 relay outputs.

The digital inputs can be enabled or disabled externally. Each input has associated with it a 32-bit counter and an 8-bit frequency reader.

The features are:

  • 4 opto-coupled inputs that can be activated with either 24 VDC / VAC or 220 VDC / VAC (properly configuring the card). These inputs are grouped as follows: two inputs have two terminals each, while the rest are grouped in pairs sharing a common line.

  • Ability to configure inputs to act as latches in order not to lose any pulse or edge.

  • Each input can be configured to act as positive or negative logic.

  • Ability to activate an antirebounds filter to correctly read the inputs connected to limit switches, push buttons, relays, ...

  • 32-bit pulse counter associated with each input whose values are maintained during power failure. It can count pulses up to a frequency of 1 kHz. The counter is stored in memory, non-volatile, even during power failure.

    Digital outputs, implemented as 1-contact relays. The features are:

    • 4 relay 1-contact relay outpus with thecapacity of switching up to 5A at 250 VAC. The relays are optocoupled to the electronics and have a varistor that protects their contacts.
    • Relays are arranged similarly to the previous module inputs, namely, two relays have two terminals each and the rest are grouped two by two so that each one has a terminal and one in common.

    • Relays can be activated for a time, allowing rapid pulses in a controlled manner.

      The unit has a nonvolatile memory that can preprogram the following parameters:

      • Values to be taken by the relays when starting the computer.

      • Values to be taken by the relays when the computer does not detect the presence of the control CPU.

M4E/4SA 
4 analog input/4 analog output ModBus module

This is a mixed module that has 4 12-bit analog inputs and 8 8-bit analog outputs. The inputs can be configured to measure current or voltage while the outputs while give a voltage range between 0V and 10V.

The main features are:

  • Inouts are individually configurable as voltage of 0 to 2.5V or 0 to 10V or as intensity of 0 to 20 mA. It is not difficult to extend the ranges with external resistors.

  • The 12-bit resolution can be expanded by an oversampling internal algorithm with noise removal filter.

  • In each analog input a window can be defined , which can activate a discreteInput each time the signal is inside or outside it. This allows the use of the analog inputs as digital inputs.

  • The analog inputs also record maximum and minimum achieved values. This is done on a holdingRegister, therefore it is possible to reset the values.

  • The 4 analog outputs of 0 to 10V are configurable from 0V to 11V (designed for installations where there is a voltage drop in the cables and want to continue to have a range of 0 to 10V). The resolution of each output is 40 mV.

  • It has a nonvolatile memory in which you can configure:

    • Values to be taken by the outputs when starting the module.

    • V Values to be taken by the outputs when the unit detects that the control module is not communicating.

    • The front LEDs can be configured to activate when the inputs or outputs are within a certain range.

M8ED 
8 digital input ModBus module

This module has 8 digital inputs which can be enabled or disabled externally. Each input has associated with it a 32-bit counter and an 8-bit frequency reader.

This module features are:

  • 8 opto-coupled inputs that can be activated with either 24 VDC / VAC or 220 VDC / VAC (properly configuring the card). These inputs are grouped as follows: two inputs have two terminals each, while the rest are grouped in pairs sharing a common line.

  • Ability to configure inputs to act as latches in order not to lose any pulse or edge.

  • Each input can be configured to act as positive or negative logic.

  • Ability to activate an antirebounds filter to correctly read the inputs connected to limit switches, push buttons, relays, ...

  • 32-bit pulse counter associated with each input whose values ​​are maintained during power failure. You can count pulses up to a frequency of 1 kHz. The counter is stored in memory, non-volatile, even during power failure.

M8SD 
8 digital output ModBus module

This module has 8 digital outputs, implemented as 1-contact relays. This module's features are:

  • 8 1-contact relay outputs capable of switching up to 5A at 250 VAC. The relays are optocoupled to the electronics and have a varistor that protects their contacts.
  • The relays are arranged similarly to the previous module inputs, namely, two relays have two terminals each and the rest are grouped two by two so that each one has a terminal and one in common.

  • The unit has a nonvolatile memory that allows pre-programming the following parameters:

    • Values to be taken by the relays when starting the unit.

    • Values to be taken by the relays when the unit does not detect the presence of the control CPU.
    • The relays can be activated for a time, allowing to give rapid pulses in a controlled manner.

M8EA 
8 analog input ModBus module

This module includes 8 12-bit analog inputs that can be configured to measure both voltage and current. The defining features are:

  • 8 analog inputs individually configurable as voltage, from 0V to 2.5V or 0V to 10V or as intensity fropm 0 to 20 mA. Externally ranges can be extended. The terminal configuration is similar to that of the two previous teams.

  • The 12-bit resolution can be expanded by an oversampling internal algorithm with noise removal filter.

  • The front LEDs can be configured to be activated when the input is inside or outside a predetermined range.

  • In each analog input a window can be defined , which can activate a discreteInput each time the signal is inside or outside it. This allows the use of the analog inputs as digital inputs.

  • The analog inputs also record maximum and minimum achieved values. This is done on a holdingRegister, therefore it is possible to reset the values. ​​

M8SA 
8 analog output ModBus module

Module of the compact family, it has 8 8-bit analog outputs of voltage range between 0V and 10V.

The features of these outputs are:

  • 8 analog outputs of 0-10 V configurable as 0V to 11V (designed for installations where there is voltage drop in the cables and want to continue to have a range of 0V to 10V). The resolution of each output is 40mV.

  • These outputs are grouped in the same manner as the three previous modules. Each output has a transistor that is able to supply a current of up to100mA and are fully shortcircuitable.

  • The unit includes a nonvolatile memory in which we can pre-program the following parameters:

    • Values to be taken by the analog outputs when starting the module.

    • Values to be taken by the analog outputs when the unit does not detect the presence of the control CPU.
    • The front LEDs can be configured to activate when the output is within or outside a predetermined range.

M24EDL 
24 digital input ModBus module

The module includes 24 voltage free inputs that can be used to read the status of buttons or switches. Each of these inputs can be configured as direct or latch.

There is also the possibility to detect a double click and to know the pulse duration with a resolution of tenths of a second.

M24SDL 
24 LED output ModBus module

This is a compact module that has 24 open collector outputs to drive LEDs. The LEDs can be on or off or flashing with an 8-bit mask.

The cards can be synchronized with each other in order not to give the appearance of a "Christmas tree" installation. The synchronization process is to read an input register that contains in its reply a synchronization signal. For this it will be needed to set at least one unit in a special direction

Each of the outputs has a current-limiting resistor, although in most cases it will be necessary to externally mount a serial resistor in parallel with the LEDs.

The maximum current of each of the outputs is 100 mA, although the combination cannot exceed 1.5 A