PACSystems RX3i Serial Communications Modules User`s Manual

Reading IIN Data from an Outstation

The ability to issue a Read to a given outstation must be set up in the Serial Communications

Module DNP3 master port configuration. In the port exchange configuration, create a Data

Exchange with an Operation of:

▪ Read Continuous, to read data continuously, with no control by the application program.

▪ Read Continuous Bit-Control, to start reading data continuously when the application program sets the associated bit in the Port Control Output Data and to stop when the application clears the same bit..

▪ Read Single Bit-Control, to read data once when the application program toggles the associated bit in the Port Control Output Data.

Select the Outstation Address of the slave. As Target Object, choose Internal Indicators, and assign PLC CPU References where the data will be written.

During operation, when the exchange is enabled as described above, the module issues a

DNP3 Read (Function Code 1) to the specified outstation. The slave returns its IIN data to the port. The module automatically writes the IIN data to the CPU Reference Address area defined in the Data Exchange.

IIN data consists of one word of bit-flags that indicate error conditions as well as general status.

MSB LSB

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Reserved, always 0

Configuration corrupt

Already executing requested operation

Event buffer overflow

Parameter error

Object unknown

Function code not supported

All Stations: broadcase message received

Class 1 events available

Class 2 events available

Class 3 events available

Need time: write time and date to slave

Local control

Device Trouble

Device Restart

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GFK-2460E Chapter 8 DNP3 Communications 8-17