Fixed Modbus Map; Table 4-2 Maximum Number Of Objects (Fixed Map Only) - Honeywell HC900 User Manual
Process controller
Hide thumbs
Also See for HC900:
- Reference manual (456 pages) ,
- User and installation manual (274 pages) ,
- Installation and user manual (264 pages)
Table of Contents
Advertisement
Modbus/TCP & Modbus RTU Function Codes
Fixed Modbus Map
4.2 Fixed Modbus Map
Table 4-2 and Table 4-3 list the the maximum number of Object Addresses and maximum number of registers
allowed per request. Also shown are differences between firmware versions 2.3 and 2.4.
Note 1: In versions 4.0 and higher these maximums apply to fixed map but not to the custom map.
Note 2: In versions 4.0 and higher function code 03 is not available for analog inputs.
Table 4-2 Maximum Number of Objects (fixed map only)
Note: objects marked with * have multiple parameters and therefore occupy multiple registers. For
example, a PID loop has over 40 parameters that can be accessed.
Object Name
Analog Inputs
Discrete Input
Discrete Output/Coil
Loop*
Variable Value
Set Point Programmer Value*
Segments per Set Point
Programmer*
Signal tags
Scheduler Value*
Segments per Schedule*
Sequencer*
Stage*
Ramp*
Hand-Off-Auto*
Alternator*
Device Control*
User Defined Registers
18
Max. No. of Objects
C30
96/12 slots v2.3
192/12 slots v2.4
192/12 slots v2.3
384/12 slots v2.4
192/12 slots v2.3
384/12 slots v2.4
8
600
8
50
2000
2
50
4
8
8
16
6
16
1024
HC900 Process Controller Communications User Guide
C50/C70/C70R
640 v2.3
3: can only access first 8 slots
1280 v2.4
of rack 1. Not available in
version 4.0 or higher.
4: can access all slots and
racks
1280 v2.3
2
2560 v2.4
1280 v2.3
1: read
2560 v2.4
5: force
32
3
600
3
8
3
50
3
2000 (C50)
3
5000 (C70/C70R)
2
3
50
3
4
3
8
3
8
3
16
3
6
3
16
3
1024
3
Function Code
Revision 13
April 2017
Advertisement
Table of Contents
