Siemens Milltronics SF 500 Instruction Manual page 93

then the register value is adjusted accordingly; e.g. an I/O value of 22 mA would be
registered as 22,000.
Diagnostic (R41,200)
Troubleshooting
Refer to
PID Tuning (R41,400 – 41,419)
For SF 500 set up for PID control, several registers have been provided for tuning. Refer to
PID Control
on page 53 and the associated parameters as listed in the register map.
Note:
Before you can change any of the setpoints, P799 must be set for remote
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 SF 500 '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.
To accommodate some Modbus drivers, the most significant byte (MSB) and least
significant byte (LSB) can be reversed. See Format Word for SF 500 on page 80 for details.
7ML19985CN01
on page 118.
13 12 11 10
R41,431
MSB
32-bit integer value (UNINT32)
Milltronics SF 500 - INSTRUCTION MANUAL
9 8 7 6 5
R41,432
LSB
1 16
4 3 2 1
LSB
1
1
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