Honeywell HC900 - Loop Values; Table 6-3 Loop Values

Parameters accessible with Function Code 03, 06,10h
Loop Values
Revision 13 HC900 Process Controller Communications User Guide 49
April 2017
6.4 Loop Values
About loop addresses
This table contains fixed addresses of Loop #1. See Table 6-1 for starting and ending fixed addresses
(hex) for Loop #2 through Loop #32. Each successive control loop is offset by 256 with the exception that
loop 25 has a new starting address and loop 26 – 32 are offset by 256. The loop number corresponds to the
PID block entry sequence during Process Control Designer configuration. The Modbus loop number
address for a loop can also be obtained from the Process Control Designer printout of Block Modbus
Addresses.
The addresses given in Table 6-3 do not necessarily apply to loops in the custom map. For custom
addresses view or print a report in HC Designer.
Function Code Support:
Reads – Function Code 3
Writes – Function Code 16 (10 hex) for preset of multiple registers (e.g., for floating point )
Writes – Function Code 6 for presetting an integer value
Table 6-3 Loop Values
Fixed
Address
(hex)
Fixed
Register
(decimal)
Parameter Name
Loop type
Access
Notes
PID
On/
Off
Carb
3Pos
AMB
0040
0065
PV




R
Floating Point in Engineering Units.
0042
0067
Remote Set Point;
SP2



R/W
Floating Point in Engineering Units.
When the remote setpoint source is configured as
LSP2, the value can be written.
0044
0069
Working Set Point



R/W
Floating Point in Engineering Units.
On a write to this register the instrument will update
the proper set point according to the loop’s
currently selected set point.
0046
0071
Output




R/W
Floating Point in Engineering Units.
0048
0073
PV




R
Floating Point in Engineering Units.
004A
0075
Carbon Potential block
temperature

R
Floating Point in Engineering Units
004C
0077
Gain #1 (Prop Band
#1 if active)


R/W
Floating Point . (in units per what was configured in
the HC900: Gain or Proportional Band)
004E
0079
Direction



R
Floating Point
0.0=Direct; 1.0=Reverse
0050
0081
Reset #1


R/W
Floating Point in Repeats/Minute or
Minutes/Repeat.
0052
0083
Rate #1


R/W
Floating Point in Minutes
0054
0085
Cycle Time for Analog
Scan




R
Floating Point in Seconds
0056
0087
PV Low Range




R
Floating Point in Engineering Units.
0058
0089
PV High Range




R
Floating Point in Engineering Units.
005A
0091
Alarm #1 SP #1




R/W
Floating Point in Engineering Units.
005C
0093
Alarm #1 SP #2




R/W
Floating Point in Engineering Units.
0060
0097
Gain #2 (Prop Band
#2 if active)


R/W
Floating Point
0062
0099
Three Position Step
Motor Deadband
R/W
Floating Point in percent