Modbus Read, Write and Override Parameters plus Exception Codes 
3/07  UDC3500 Universal Digital Controller Product Manual  353 
10.5 Setpoints 
Overview 
You can use four separate local setpoints in the controller. The identifying register 
addresses listed in Table 10-5 allow you to select which setpoint you want to use and to 
enter a value in Engineering Units or Percent (whichever is selected at register address 
00A1) for that setpoint via com
munications. 
Register Addresses 
Make your selection using register address 00AD and enter the value for the setpoint 
chosen using register address in Table 10-5. 
 
Table 10-5  Setpoint Code Selections 
Parameter 
 
Register 
Address 
Data 
Type 
Access  Data Range or 
Enumerated Selection 
Description  ID  Hex  Decimal       
Local Setpoint #1 
Loop1 
39  0027  039  FP  R/W  Value within the setpoint 
range limits 
Local Setpoint #2 
Loop1 
53  0035  053  FP  R/W  Value within the setpoint 
range limits 
Local Setpoint #3 
Loop1 
116  0074  116  FP  R/W  Value within the setpoint 
range limits 
Local Setpoint #4 
Loop1 
112  0070  112  FP  R/W  Value within the setpoint 
range limits 
Number of Local 
Setpoints Loop 1 
173  00AD  173  INT  R/W  00 = Local Setpoint #1 only 
01 = 2nd Local Setpoint via 
keyboard or communications 
03 = 3rd Local Setpoint via 
keyboard or communications 
04 = four Local Setpoint via 
keyboard or communications 
Local Setpoint #1 
Loop2 
39  0127  295  FP  R/W  Value within the setpoint 
range limits 
Local Setpoint #2 
Loop2 
53  0135  309  FP  R/W  Value within the setpoint 
range limits 
Local Setpoint #3 
Loop2 
116  0174  372  FP  R/W  Value within the setpoint 
range limits 
Local Setpoint #4 
Loop2 
112  0170  368  FP  R/W  Value within the setpoint 
range limits