User manual

PID Loop Operation
(DL450 Only)
Maintenance
8--25
PID Loop Operation (DL450 only)
DL405 User Manual, 4th Edition, Rev. A
Each loop that you configure has the option of using a built-in Ramp/Soak generator
dedicated to that loop. This feature generates SP values in a continuous stream,
called a profile. To use the Ramp/Soak feature, you must program a separate table
of 32 words with appropriate values. A DirectSOFT dialog box makes this easy to
do.
In the basic loop table, the Ramp/Soak Table Pointer at Addr + 34 must point to the
start of the ramp/soak data for that loop. This may be anywhere in user memory, and
does not have to be adjoining to the Loop Parameter table, as shown to the left. Each
R/S table requires 32 words, regardless of the number of segments programmed.
The ramp/soak table parameters are defined in the table below. Further details are in
the section on Ramp/Soak Generator section in this chapter.
Addr
Offset
Step Description
Addr
Offset
Step Description
+00 1 Ramp End SP Value +20 9 Ramp End SP Value
+01 1 Ramp Slope +21 9 Ramp Slope
+02 2 Soak Duration +22 10 Soak Duration
+03 2 Soak PV Deviation +23 10 Soak PV Deviation
+04 3 Ramp End SP Value +24 11 Ramp End SP Value
+05 3 Ramp Slope +25 11 Ramp Slope
+06 4 Soak Duration +26 12 Soak Duration
+07 4 Soak PV Deviation +27 12 Soak PV Deviation
+10 5 Ramp End SP Value +30 13 Ramp End SP Value
+11 5 Ramp Slope +31 13 Ramp Slope
+12 6 Soak Duration +32 14 Soak Duration
+13 6 Soak PV Deviation +33 14 Soak PV Deviation
+14 7 Ramp End SP Value +34 15 Ramp End SP Value
+15 7 Ramp Slope +35 15 Ramp Slope
+16 8 Soak Duration +36 16 Soak Duration
+17 8 Soak PV Deviation +37 16 Soak PV Deviation
The individual bit definitions of the Ramp/Soak Table Programming Error Flags
(Addr + 35) word are listed in the following table.
Bit R/S Error Flag Bit Description
Read/
Write
Bit=0 Bit=1
0 Starting Addr out of lower V-memory range read -- Error
1 Starting Addr out of upper V-memory range read -- Error
2--3 Reserved for future Use -- -- --
4
Starting Addr out of System Parameter
V-memory Range
read
--
Error
5--15 Reserved for future Use -- -- --
Ramp/Soak
Table Location
(Addr + 34)
V--Memory Space
User Data
LOOP #1
V2000
32 words
LOOP #2
32 words
V2037
Ramp/Soak #1
32 words
V3000
V2034 = 3000 octal
Pointer to R/S table
Ramp/Soak Table
Programming Error
Flags
(Addr + 35)