openFDIO Specification

openFDIO is a Field Digital IO module with digital input and output. The module can be interfaced with a PLC, SCADA or any HMI device to control and scan the outputs and inputs. The current module will implement Modbus-RTU for communication, but more communication protocol will be added in the future.

Power Requirement

Voltage -- 24VDC
Current -- 500mA

Input Interface

The unit will receive digital input in the following range

High Input    --    12 to 28 VDC
Low Input     --    0 to 5 VDC

Output Interface

The digital output from the unit can be of 5 type

Relay output                --    230VAC/2A, 30VDC/2A
Solid State Relay AC Output --    230VAC/2A
Solid State Relay DC output --    30VDC/2A
Transistor NPN              --    24VDC/500mA
Transistor PNP              --    24VDC/500mA

Communication Interface

The communication with Scada or to PLC will be through Modbus-RTU protocol. The physical layer implementation will be through 2 wire RS485.

Module Naming

Product Code - openFDIO - XY - AB - P

X --> No of Digital Input
Y --> No of digital Output

    XY --> 0404, 0400, 0004, 0808, 0800, 0008, 0016, 1600

A --> Output type
B --> Output type sub category

    A --> Relay             -- R
          Solid state Relay -- S
          Transistor        -- T                                               
    B --> SSR output AC     -- A
          SSR output DC     -- D
          Transistor PNP    -- P
          Transistor NPN    -- N

P --> Communication protocol

    P --> 2 wire Modbus-RTU -- 2M

Sample Device Code - openFDIO-0808-SD-2M