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Register Map for Process and Operation Type Variables
Scheduler Value Register Map
64 HC900 Hybrid Controller Communications User Guide Revision 4
9/03
Scheduler Numbers
The parameters that follow refer to SP Scheduler #1. Table 6-10 lists the Starting and Ending addresses for
all of the SP Schedulers.
Table 6-17 SP Scheduler Addresses
Scheduler Number Starting
Address
(Hex)
Starting
Address
(Decimal)
Ending
Address
(Hex)
Ending
Address
(decimal)
SP Scheduler 1 3000 12289 304F 12368
SP Scheduler 2 3050 12369 309F 12448
Procedures for Downloading Setpoint Schedules
Table 6-18 is for downloading using Function Codes 3, 6, 16.
Table 6-18 Steps to Download a Setpoint Schedule using Modbus Function Codes 3, 6, 16
Step Action
1
Set the scheduler to RESET by writing any number to 12367 (304E). This can be done
either with function code 6 or 16.
2
Clear the schedule by writing a 0 to registers 12321 and 12322 (3020 and 3021). This is a
floating point register and requires a multiple register write (function code 16). This is the
safest way to insure that all registers are cleared for the next schedule download.
3
Write the header information for parameters relevant to the schedule (leave all others at 0) -
- registers 12331 (302A) - 12347 (303A) and register 12368 (304F). Registers 12331 -
12347 are floats and must be written using function code 16. Register 12368 is bit-packed
and can be written with either function code 6 or 16.
4
Write the information for each segment required in the schedule -- registers 3200 – 322F for
segment 1, 3230 – 325F for segment 2, etc. The first 9 registers are bit-packed and can be
written with either function code 6 or 10. The rest of the registers are float and must be
written using function code 16.
5
Save the schedule to a schedule number archive by writing a floating point number to
register 12329. This will store the downloaded data utilized by the scheduler block to the
schedule number used. Schedule numbers may range from 1-50.
The schedule is now ready to run. Note that the current schedule number -- register 12321-- is
automatically set to the saved schedule number.