Emerson DL8000 - Modbus Registers; B.5 Modbus Registers

DL8000 Preset Instruction Manual
B-12 Modbus Communications Revised February-2016
Table B-4. Modbus Events and Alarms Log Contents
Byte
Contents of Event Log Record
Contents of Alarm Log Record
1-2
Operator change (Event Log) bit map (16-bit
integer). See Table B-5.
Alarm change bit map (16-bit integer). See Table
B-5.
3-4
Modbus register number of variable (16-bit
integer)
Modbus register number of variable (16-bit
integer)
5-8 Time Stamp (HHMMSS; 32-bit floating point) Time Stamp (HHMMSS; 32-bit floating point)
9-12 Date Stamp (MMDDYY; 32-bit floating point) Date Stamp (MMDDYY; 32-bit floating point)
13-16 Previous value of variable (32-bit floating point)
Current (alarmed) value of variable (32-bit floating
point)
17-20
Current (New) value of variable (32-bit floating
point)
Unused at the current time (zero-filled when
transmitted to the master)
Table B-5. Events and Alarm Change Bit Map Contents
Bit
Operator Change Bit Map
Alarm Change Bit Map
0
Fixed value - change to an EU value on an I/O point in Manual
Mode
Not Used
1
Zero scale - change to the 0% Adjusted on an AO or AI
Not Used
2 Full scale - change to the 100% Adjusted on an AO or AI Not Used
3
Operator entry work value - change to any parameter other than
those described
Not Used
4 Boolean fixed bit - change to Status in DO or DI Not Used
5 Fixed/variable flag - change to Manual Mode for an I/O point Manual alarm
6 Table entry change - change to Modbus Function Tables Status Change alarm
7 System command change - events logged by system (Power up) No Flow alarm
8 Not Used Point Fail alarm
9 Operator change (Event Log) or Alarm identifier bit Event or alarm identifier bit
10 Low Low Limit - change to Low Low Alarm parameter Low Low alarm
11 Low Limit - change to Low Alarm parameter Low alarm
12 High Limit - change to High Alarm parameter High alarm
13 High High Limit - change to High High Alarm parameter High High alarm
14 Rate of Change Limit - change to Rate Alarm parameter Rate alarm
15 Not Used
Set/clear alarm
(1 = set, 0 = clear)
B.5 Modbus Registers
Modbus Register tables allow you to map Modbus registers to Point
Type, Logical, and Parameter (TLP) numbers. Using either Point
Indexing or Parameter Indexing, you can map more than one line in the
Modbus Register table to more than one register-to-TLP pair.
 In point indexing, you map the Start Register to the selected TLP.
You then map subsequent registers (through the End Register) to the