Campbell Scientific CR6 CR6 Measurement and Control System - Page 410
Programming for DNP3
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Section 8. Operation Distributed Network Protocol (DNP) is an open protocol used in applications to ensure data integrity using minimal bandwidth. DNP implementation in the CR6 is DNP3 Level-2 Slave Compliant with some of the operations found in a Level-3 implementation. A standard CR6 program with DNP instructions will take arrays of real time or processed data and map them to DNP arrays in integer or binary format. The CR6 responds to any DNP master with the requested data or sends unsolicited responses to a specific DNP master. DNP communications are supported in the CR6 through the RS-232 port, COM2, or over TCP, taking advantage of multiple communication options compatible with the CR6, e.g., RF, cellular phone, satellite. DNP3 state and history are preserved through power and other resets in non-volatile memory. DNP SCADA software enables CR6 data to move directly into a database or display screens. Applications include monitoring weather near power transmission lines to enhance operational decisions, monitoring and controlling irrigation from a wastewater-treatment plant, controlling remote pumps, measuring river flow, and monitoring air movement and quality at a power plant. 8.6.2.2 Programming for DNP3 CRBasic example Implementation of DNP3 (p. 412) lists CRBasic code to take Iarray() analog data and Barray() binary data (status of control port 5) and map them to DNP arrays. The CR6 responds to a DNP master with the specified data or sends unsolicited responses to DNP Master 3. 8.6.2.2.1 Declarations (DNP3 Programming) Table DNP3 Implementation - Data Types Required to Store Data in Public Tables for Object Groups (p. 410) shows object groups supported by the CR6 DNP implementation, and the required data types. A complete list of groups and variations is available in CRBasic Editor Help for DNPVariable(). Table 106. DNP3 Implementation - Data Types Required to Store Data in Public Tables for Object Groups Data Type Group Description Boolean 1 Binary input 2 Binary input change 10 Binary output 12 Control block Long 30 Analog input 32 Analog change event 40 Analog output status 41 Analog output block 50 Time and date 51 Time and date CTO 410
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