87
Parameter Register Address Listings
Calculating Parameter Register Addresses
Integer Only
I1
Floating Point
Register Address Calculation
(hex)
Address
A 0x4000
Address x 2 + 0x8000
(dec)
Address
A 16384
Address x 2 + 32768
Address Example:
(For Loop 1 Process Variable)
(hex)
0x0407
0x4407
0x880E
(dec)
1031
17415
34830
Data Value Returned: If actual
Value = 23.9 decimal
(hex)
0x00, 0x17
0x00, 0xEF
0x41, 0xBF, 0x33, 0x33
(dec)
23
239
23.9 as floating decimal
The register address offset calculations are shown
above.
For your convenience, the parameter tables on the fol-
lowing pages show each parameter’s Modbus register
address as a decimal and hexadecimal number for all
three formats. The tables also show if the parameter
has read-only (
RO) or read-write (RW) access.
Analog parameter values and their limits are expressed
as decimals.
Bit parameters list the bit positions and their meaning
(bit 0 = LSB). Only bits that have a function are listed,
unused bits are omitted.
Calibration Reminder Parameters
Parameter Name & Register Address
Integer Int +1
Float
Access Values & Description
Calibration Reminder Enable
Value
Calibration Reminder Status
Dec
1048
17432
34864
RW
0
Disabled
Hex
0418
4418
8830
1
Enabled
Calibration Reminder Date
Value
Calibration Reminder Status
Dec
n/a
n/a
34866
RW
This can be entered only as a floating point number.
When converted to binary the least significant 19 bits represents
the date in this format:
www
DDDDD
MMMM
YYYYYYY
YYYYYYY
= YEAR
MMMM
= MONTH
DDDDD = DAY OF MONTH
(1-31 but must be valid)
www = Day of the week
The day of week portion
is calculated from the date (Read Only).
Example with date set to
31/07/2012
Day (31) = 11111
Month (7) = 0111
Year (12) = 0001100
Bits 17 and higher are ignored when writing so
11111 0111
0001100 (64396 decimal) is just one of many possible numbers
to write as 31/07/2012, and when reading the date back, the
number returned is
10
11111 0111 0001100 (195468 decimal) because bits 17-19
are
010
(to represent “Tuesday”).
Hex
n/a
n/a
8832
Summary of Contents for Chromalox 4081
Page 2: ...B ...