Siemens Milltronics BW500 Operating Lnstructions page 111

PID Tuning (R41,400 – 41,419)
For BW500 set up for PID control, several registers have been provided for tuning. Refer
PID Control
to on page 71 and the associated parameters as listed in the register map.
Before you can change any of the setpoints, P799 must be set for remote
Note:
control.
Parameter Values
Bit Mapped
Bits are packed into registers in groups of 16 bits (1 word). In this manual we number the
bits from 1 to 16, with bit 1 being the least significant bit and bit 16 referring to the most
significant bit.
16 15 14
MSB
32 Bit
Large numbers are put into unsigned 32 bit integers with a fixed decimal place of three.
For example, a value of '7345' represents a value in the BW500 '7.345' . The default word
order is that the first word is the most significant word (MSW) and the second word
(register) is the least significant word (LSW).
For example, if we read R41,431 as a 32-bit, the 32 bits would look like the following:
16
32
The whole is read as a 32-bit integer.
The most significant byte (MSB) and least significant byte (LSB) can be reversed to
accommodate some Modbus drivers. See Format Word for BW500 on page 98 for details.
1)
Not available with BW500/L.
7ML19985DK05Milltronics BW500 and BW500/L - OPERATING INSTRUCTIONS
1)
13 12 11 10
R41,431
MSB
32-bit integer value (UNINT32)
9 8 7 6
R41,432
LSB
1 16
5 4 3 2
LSB
1
1
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