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Sample System Requirement and Solution

This example includes a sample system requirement, and the resulting ClearSCADA configuration required to fulfill such a requirement.

The example builds on the concepts that are detailed in the previous Configuration Examples in this section.

Example:

Requirement:

The Simple Modbus driver on a ClearSCADA system is required to scan the following points on a Modbus PLC:

Four analog points, comprising one at each of these locations:

  • 3:00005 (INT)
  • 3:00010 (DINT)
  • 3:00100(REAL)
  • 4:00011 (UINT).

Five digital points, comprising one at each of these locations:

  • 3:00012 bit offset 5
  • 1:00005
  • 0:00006
  • 1:00009
  • 1:00025.

Solution:

To fulfill the above requirement, five Modbus Scanners are needed to scan these data ranges:

  • 0:00006
  • 1:00005 to 1:00025
  • 3:00005 to 3:00012
  • 3:00100 to 3:00101
  • 4:00011

(The two ranges within the 3: range are scanned separately to avoid needlessly scanning 88 unused registers in between the required ranges.)

These Modbus Scanners are configured within ClearSCADA:

Configuration Field on Modbus Scanner Form Required Scanner Range
0:00006 1:00005 to 1:00025 3:00005 to 3:00012 3:00100 to 3:00101 4:00011

(Scanner) Name

Output Coils

Input Discretes

Input Registers Low

Input Registers High

Holding Registers

Data Address

5

4

4

99

10

Data Length

1

21

8

2

1

Location

Output Coils

Input Discretes

Input Registers

Input Registers

Holding Registers

Address Base

1

1

1

1

1

These Modbus Analog Points are configured within ClearSCADA:

Configuration Field on Modbus Analog Point Form Required Analog Point Data
3:00005 (UINT) 3:00010 (DINT) 3:00100 (REAL) 4:00011 (UINT)

Scanner (with which the point is associ­ated)

Input Registers Low

Input Registers Low

Input Registers High

Holding Registers

Word Offset

0

5

0

0

Data Type

UINT

DINT

REAL

UINT

These Modbus Digital Points are configured within ClearSCADA:

Configuration Field on Modbus Digital Point Form Required Digital Point Data
0:00006 1:00005 1:00009 1:00025 3:00012 Bit Offset 5

Number of Bits

1

1

1

1

1

Scanner (with which the point is associ­ated)

Output Coils

Input Discretes

Input Discretes

Input Discretes

Input Registers Low

Word Offset

0

0

0

1

7

Bit Offset

0

0

4

4

5


ClearSCADA 2015 R2