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4. Configuration

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pulses , also known by trip/close commands, with determined duration (enough to the switching of

the device under control).

Consult the Double Points section of Utilization Manual for informations about double digital points

through DBP data type.

Once the Nexto Series digital input and output modules don’t support DBP points mapping, some

application trickery are needed to make it possible. Remembering that is also not possible to use the

PulsedCommand function, defined at the LibRtuStandard library, to operate the Nexto Series digital

double points.

Digital Input Double Points

For the digital input modules it is needed two auxiliary variables’ declaration, to be mapped on the

digital input module, besides the double point that is wished to map on the server.

 The double point value variable: type DBP;

 The simple point OFF/TRIP value variable: type BOOL;

 The simple point ON/CLOSE value variable: type BOOL.

Figure 4-70. Double Point Variables Declaration Example

Done the variables declaration, it is necessary to create a link between the value variables and the

digital input module quality, through the CPU’s Internal Points tab.

Figure 4-71. Double Point Variables Attribution to Internal Points

The double point value variable must be mapped at the server IEC 60870-5-104 driver, and both

simple variables at the Nexto Series digital input module (in that example, a NX1001). Tipically the

OFF (TRIP) state is mapped to the even input and the ON (CLOSE) state to the odd input.

ALTUS Nexto NX3004 User Manual

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