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3-12
In Modbus, a value will be returned based on the type of reading.
Negative Maximums and Positive Minimums return: 7FFFFFFFH or 2,147,483,647.
Positive Maximums and Negative Minimums return: 80000000H or +/- 2,147,483,647.
No Timestamp will be assigned to the reading.
3.15:
Type
F15
Limit
States
Q
Length: 1 Register (2 bytes)
Q
This register has two bytes. Each byte has eight bits. The bits in these bytes are associated with the
16 Limits, the most significant bit of the most significant byte with Limit 1 (or 17), through to the
least significant bit of the least significant byte with Limit 16 (or 32).
Q
A bit value of 1 means that the particular limit has been passed, while a bit value of 0 means that the
particular limit has not been passed.
Example:
Register 02769, Limit States, Value 1 Comparison, 1–16, might contain the following data:
Address
Value
Bytes
Bits
Points
Limit
Passed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0123456789101112131415
111100000 000 0000
04H 61H
0461H
02769
No
Interpretation Limits 6, 10, 11 and 16 are currently passed; all others are not passed.
No No No YesNoYesNoNoNoYesYesNoNoNoNo