ProSoft Technology QTS-CLX-PVX User Manual download pdf (Page 29)

QTS-CLX-PVX Page 23

Accessing I/O Data

Required Connections

In master mode, the QTS-CLX-PVX does not begin scanning the I/O bus until all

ControlLogix connections to the module are present.

If the connection is later closed, the QTS-CLX-PVX continues scanning the bus. Inputs

do not update in the ControlLogix while the connection is closed and outputs do not

update.

In monitor mode, the module does not wait for ControlLogix connections.

Data Updates

It is important to remember always that the PROVOX Control I/O bus updates data only

when the data changes.

Any changes that occur when the module is not connected to the bus will not be captured.

Discrete Data

Use the aliases created by ClxPvxCfg to access discrete data to ensure that you are using

the correct address and bit.

Analog Data Format

Analog values on the Control I/O bus are expressed in PROVOX Percent Format. The

number is shown in the PROVOX controller as a percent with 3 decimal places. The

range is -13.969% to +113.970%.

Each 16-bit word consists of:

upper byte = signed byte, represents the whole number part of the percentage

lower byte = unsigned byte, represents the fractional part, as a fraction of 256

Some examples:

Number, percent

High byte, hex

Low byte, hex

Number, hex

-13.97%

F208

-1.75%

FE40

0.00%

0000

1.75%

01C0

25%

1900

25.25%

1940

50%

3200

75%

4B00

100%

6400

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ProSoft Technology QTS-CLX-PVX User Manual Page 29

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