Honeywell HC900 User Manual
Page 75
Revision 10
HC900 Hybrid Controller Communications User Guide
67
12/07
Scheduler Addresses
The parameters that follow refer to SP Scheduler #1. Table 6-12 lists the Starting and Ending addresses for
all of the SP Schedulers. For custom addresses view or print a report in HC Designer.
Table 6-12 SP Scheduler Addresses
Scheduler Number
Starting
Address
(Hex)
Starting
Register
(Decimal)
Ending
Address
(Hex)
Ending
Register
(decimal)
SP Scheduler 1
3000
12289
304F
12368
SP Scheduler 2
3050
12369
309F
12448
Procedures for Downloading Setpoint Schedules
Table 6-13 is for downloading using Function Codes 3, 6, 16.
Table 6-13 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 Reset (p. 70). This can be done
either with function code 6 or 16.
2
Clear the schedule by writing a 0 to Current Program Number (p. 69). 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, that is, Guaranteed
Soak Limits 1-8 (p. 69), Jog Segment (p. 69), Time Units (p. 70). Guaranteed Soak Limits 1-
8 and Jog Segment are floats and must be written using function code 16. Time Units is bit-
packed and can be written with either function code 6 or 16. Leave all others at 0.
4
Write the information for each segment required in the schedule (p. 71). 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
Schedule Save Request (p. 69). 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 program (schedule) number (p. 69) is
automatically set to the saved schedule number.