Automationdirect.com DL05, User Manual

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PID Loop Operation
Maintenance
8–59
PID Loop Operation
The parameters in the ramp/soak table must be user-defined. the most convenient
way is to use
Direct SOFT, which features a special editor for this table. Four
parameters are required to define a ramp and soak segment pair, as pictured below.
S
Ramp End Value – specifies the destination SP value for the end of the
ramp. Use the same data format for this number as you use for the SP.
It may be above or below the beginning SP value, so the slope could be
up or down (we don’t have to know the starting SP value for ramp #1).
S
Ramp Slope – specifies the SP increase in counts (units) per second. It
is a BCD number from 00.00 to 99.99 (uses implied decimal point).
S
Soak Duration – specifies the time for the soak segment in minutes,
ranging from 000.1 to 999.9 minutes in BCD (implied decimal point).
S
Soak PV Deviation – (optional) specifies an allowable PV deviation
above and below the SP value during the soak period. A PV deviation
alarm status bit is generated by the ramp/soak generator.
Ramp/Soak Table
V+00 Ramp End SP Value XXXX
SP
Soak PV
deviation
V+01 Ramp Slope XXXX
V+02 Soak Duration XXXX
V+03 Soak PV Deviation XXXX
Ramp End
SP Value
Soak
duration
segment becomes active
Slope
The ramp segment becomes active when the previous soak segment ends. If the
ramp is the first segment, it becomes active when the ramp/soak generator is
started, and automatically assumes the present SP as the starting SP.
Offset Step Description 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