Ritron DATAFLOW RTU Series Betriebsanweisung PDF herunterladen (Seite 47)

Software/Programming

EXAMPLE 6

8.7 EXAMPLE 6 demonstrates the DATAFLOW RTU as a MODBUS device using direct data

access. The configuration consists of a remote RTU with another RTU connected to a

MODBUS controller, utilizing RTU Programming Software as the MODBUS controller. Each

RTU has five digital inputs and one analog input.

NOTE: In real applications the MODBUS controller is a PLC or a SCADA program operating with a

MODBUS driver.

8.7.1 RTU ID 1 SETUP: Example 6 requires one DATAFLOW RTU to be wired and its hardware

configured according to Figure B12 - EXAMPLE 6 ID 1 Wiring Diagram on page B-36. Load

Software Programming configuration file EXP6ID1.USR into RTU ID 1.

When configuration of RTU ID 1 is completed, turn the RTU power OFF then back ON to

ensure the RTU microprocessor addressing data is updated. Refer to the NOTE with 8.7.4 for

further details.

8.7.2 RTU ID 2 SETUP: Example 6 requires the other DATAFLOW RTU to be wired and its

hardware configured according to Figure B13 - EXAMPLE 6 ID 2 Wiring Diagram on page

B-37. Load Software Programming configuration file EXP6ID2.USR into RTU ID 2.

8.7.3 EXPLANATION: Although the RTU can operate in two different MODBUS modes, Example 6

demonstrates direct access only. In this mode, the remote RTU is polled by RF whenever data

is required, generating a large amount of RF traffic.

NOTE: This configuration is recommended only for applications having long polling intervals (over 2

minutes) and few RTUs (fewer than 5).

8.7.4 Examine the configuration of RTU ID 1 and RTU ID 2. Because the RTUs are no longer in

control of the process and are simply MODBUS devices under control of the MODBUS

controller:

· XMIT CHECK IN is set to 0.

· SEND LIST is all 0s.

· REPEAT LIST is all 0s.

· All inputs have INITIATE XMIT set to NO.

· All outputs have USED set to NO.

NOTE: Examine the SCADA CONFIG. screen display for RTU ID 1, containing four SCADA points stored

in EEPROM. The four points load into FULL SCADA list at power ON. Cycling the power updates data for

this screen. In Example 6, the END RTU ID and the TO ID are the same ID because an RTU is the

MODBUS device being controlled.

(Example 6 continued on next page)

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Ritron DATAFLOW RTU Series Betriebsanweisung Seite 47