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Register Map for Process and Operation Type Variables
Loop Value Register Map
42 HC900 Hybrid Controller Communications User Guide Revision 4
9/03
6.3 Loop Value Register Map
This table contains addresses of Loop #1. See the Global Register Map - Table 6-1 for starting and
ending 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 - 32are offset by 256. The loop
number corresponds to the PID block entry sequence during Hybrid Control Designer configuration. The
Modbus loop number address for a loop can also be obtained from the Hybrid Control Designer printout of
Block Modbus Addresses.
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 Value Register Map Addresses
Address
(hex)
Register
(decimal)
Parameter Name Access Notes
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 40069 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.