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8903/PB Profibus Communications Interface
Appendix B : DSE/Profibus Conversion Rules
The rules governing the conversion between 890 data types and Profibus PLC data types are
given below Note carefully that some conversions will result in rounding, limiting and
truncation of the original value. Certain conversions are not supported, however if used then
data space will be allocated in the buffer, but a data value of zero will be returned.
LOGIC Type Connector
Data from PLC
Data to 890
From BOOLEAN to LOGIC
False
True
False
True
From FLOATING POINT to LOGIC
Zero
Non-zero
False
True
From INTEGER 8 to LOGIC
Zero
Non-zero
False
True
From INTEGER 16 to LOGIC
Zero
Non-zero
False
True
From INTEGER 32 to LOGIC
Zero
Non-zero
False
True
From UNSIGNED 8 to LOGIC
Zero
Non-zero
False
True
From UNSIGNED 16 to LOGIC
Zero
Non-zero
False
True
From UNSIGNED 32 to LOGIC
Zero
Non-zero
False
True
Data from 890
Data to PLC
From LOGIC to BOOLEAN
False
True
False
True
From LOGIC to FLOATING POINT
False
True
0.0
1.0
From LOGIC to INTEGER 8
False
True
0
1
From LOGIC to INTEGER 16
False
True
0
1
From LOGIC to INTEGER 32
False
True
0
1
From LOGIC to UNSIGNED 8
False
True
0
1
From LOGIC to UNSIGNED 16
False
True
0
1
From LOGIC to UNSIGNED 32
False
True
0
1
