Parameters accessible with Function Code 03, 06,10h 
Stage 
78  HC900 Process Controller Communications User Guide  Revision 13 
    April 2017 
6.12 Stage 
Summary 
This section contains addresses for the Stage function blocks.   
See the Stage Register Maps in Table 6-1 for starting and ending addresses (hex) for Stage #1 through 
Stage #8 Map Addresses. 
The Modbus Stage number address for a Stage block can also be obtained from the Process Control Designer 
report.  
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 
For custom addresses view or print a report in HC Designer. 
Table 6-22 Stage Parameters  
Floating Point in Engineering Units 
Floating Point in Engineering Units 
Stage #1-4 
Override Status 
Bit 0: Stage #1 Override Active: 0=NO, 1=YES 
Bit 1: Stage #1 Override ON: 0=OFF, 1=ON 
Bit 2: Stage #2 Override Active: 0=NO, 1=YES 
Bit 3: Stage #2 Override ON: 0=OFF, 1=ON 
Bit 4: Stage #3 Override Active: 0=NO, 1=YES 
Bit 5: Stage #3 Override ON: 0=OFF, 1=ON 
Bit 6: Stage #4 Override Active: 0=NO, 1=YES 
Bit 7: Stage #4 Override ON: 0=OFF, 1=ON 
Bits 8-15: Unused 
Stage #1-4 PV 
On/Off Comparison 
Bit 0:  Stage #1 On Comparitor: 0=PV1, 1=PV2 
Bit 1:  Stage #1 Off Comparitor: 0=PV1, 1=PV2 
Bit 2:  Stage #2 On Comparitor: 0=PV1, 1=PV2 
Bit 3:  Stage #2 Off Comparitor: 0=PV1, 1=PV2 
Bit 4:  Stage #3 On Comparitor: 0=PV1, 1=PV2 
Bit 5:  Stage #3 Off Comparitor: 0=PV1, 1=PV2 
Bit 6:  Stage #4 On Comparitor: 0=PV1, 1=PV2 
Bit 7:  Stage #4 Off Comparitor: 0=PV1, 1=PV2 
Bit 8-15: Unused