Honeywell HC900 User Manual page 71

Example For Determining a Segment Register's fixed address
Note: Custom map users should ignore this procedure. Obtain segment addresses by printing a Modbus
Register Report in HC Designer.
To change the ramp value in segment #8 of setpoint programmer #2, the register address is determined as
follows.
Step 1: Use Table 6-1 to determine the start address for setpoint programmer #2 segments. The value is
2A00 Hex.
Step 2: Calculate the offset address for segment 8 in a profile. This is calculated as:
Segment #8 offset address
Step 3: Use the table above to determine the register offset for the ramp value. The value is 4.
Step 4: Calculate the address by adding the results of steps 1, 2, and 3 to determine the register address.
Register address
Revision 13
April 2017
= (segment number – 1) * 8
= (8-1) * 8
= 56 or 38 Hex
= Setpoint program #2 segment start address
+ Segment 8 offset address
+ Ramp value register offset
= 2A00 + 38 + 4
= 2A3C
HC900 Process Controller Communications User Guide
Parameters accessible with Function Code 03, 06,10h
Set Point Programmer
63