Device to send digital Inputs to Modbus SLAVE?

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Automation1971

Is there a simple Device to send multiple digital Inputs to a Modbus Slave Register?

The Interface to the process control should be purely analog and digital signals, but there is one measurement device which provides its measurement value as 4..20mA (That is good) but can configuration is done over Local Display or Modbus Protocol (Device is a Slave). Now we need to provide the possibility to any and each process control system to change the Measuring Mode of this Device. We would like to so this through 4 digital Signals which are mapped to defined values of 1 Modbus Register in the Modbus Slave. I should add that the Device should be Not expensive or complex in handling.

Any advice is very much appreciated.

Thank you in Advanced.
 
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