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Page 24 QTS-CLX-PVX September 2009
Number, percent
High byte, hex
Low byte, hex
Number, hex
113.97%
71
F8
71F8
Modules like thermocouples linearize the inputs to percent of range, 1 to 5V.
Add-on instructions for RSLogix 5000 to convert between PROVOX percent and
ControlLogix real numbers are available from the downloads area of the Rockwell
Automation support website
http://samplecode.rockwellautomation.com/
In the Sample Code Library, search for “AOI for QTS-CLX-PVX PROVOX Module REV”
Converting PROVOX Percent Format to ControlLogix Real
For positive values (high bit of upper byte clear), add the whole number part (upper byte)
to the fraction (lower byte divided by 256).
For negative values (high bit of upper byte set), subtract 256 from the whole number part
and add the fractional part.
Example 1:
To convert 1940 hex, first note that the number is positive (high bit clear).
Convert the whole number part, 19 hex, to 25 decimal. The fractional part is 40 hex = 64
decimal. Convert it to a fraction = 64/256 =.25 and add the whole number part to get
25.25%.
Example 2:
To convert E780 hex, first note that the number is negative (high bit set). Subtract 256
from the whole number part (E7 hex = decimal 231), to get -25. The fractional part is 80
hex =128 decimal. Convert it to a fraction = 128/256 = .5. Add the parts to get -25 + .5
= -24.5%
Converting ControlLogix Real to PROVOX Percent Format
For positive values:
1. Convert the whole number part and store it in the upper byte.
2. Multiply the fractional part by 256 and store it in the lower byte.
For negative values:
1. First add 256 to the whole part. If the fractional part is non-zero (in practice,
greater than .039), subtract 1 from the result. Store the result in the upper
byte.
2. Subtract the fractional part from 1 and multiply the result by 256. Store the
result in the lower byte.
- User Manual 1
- QTS-CLX-PVX Page iii 5
- QTS-CLX-PVX Module Overview 7
- Part Number 8
- Module Features 8
- Power Requirements 9
- Other Requirements 9
- Package Contents 9
- Installation 10
- QTS-CLX-PVX Page 5 11
- Replacing a Module 12
- Cabling and Termination 13
- Software Installation 13
- Summary of Operations 14
- Important Considerations 15
- Module Configuration 16
- QTS-CLX-PVX Page 11 17
- I/O Data Mapping 18
- Configuring the I/O 20
- Setting the Module Mode 21
- QTS-CLX-PVX Page 17 23
- Mapping the I/O Data 24
- What gets mapped 25
- Saving a Configuration File 26
- Opening a Configuration File 26
- Clearing the Configuration 26
- The Configuration Signature 27
- Aliases 27
- Accessing I/O Data 29
- Diagnostic Data 31
- QTS-CLX-PVX Page 27 33
- Troubleshooting 35
- RSLogix 5000 36
- The Debug Log 37
- Fatal Errors 37
- Updating the Firmware 38
- Appendix:ClxPvxCfg 39
- QTS-CLX-PVX Page 35 41
- QTS-CLX-PVX Page 37 43
- Specifications 44
- Support 45
- Warranty 46
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