Instruction Manual

6-26 IM 04L31A01-17E
External Loop PID Parameter Settings
DT Sets the external loop PID
parameter
Syntax DT p1,p2,p3,p4<terminator>
p1: Loop number (1–16, or 1–4 on the CX1000)
p2: Loop number
1–4 for UT320/UT321/UT350/UT351
1–8 for UT420/UT450/UT520/UT550/UT750
p3: PID parameter name
SP: target setpoint (EU(0.0–100.0%)
A1-A4: Alarm 1–4 setting value (or alarm
1–3 for the UT320/UT321/UT350/
UT351/UT420)
Measured value alarm/setting
value alarm: measured input
range of -100.0–100.0%
Deviation alarm: measured input
range span of -100.0–100.0%
Output value alarm: -5.0–105.0%
Time alarm (alarm 1 only): -1–
5999
P: Proportional band setting (1–9999)
OH: Output limit upper limit value (-5.0–
105.0%)
OL: Output limit lower limit value (-5.0–
105.0%)
MR: Manual reset (-5.0–105.0%)
(Active when integral time I is OFF)
H: On/off control hysteresis
During On/off control: Measured input
range span of -100.0–100.0%
During position proportional PID
control: 0.0-100.0%
DB: Dead band
During position proportional PID
control: 1.0-10.0%
DR: Correct back switching operation [2]
0: Back, 1: Right action [2]
PO: Preset output value (-5.0–105.0%)
For loops set to the CX’s external loop
tuning item, the external loop tuning
items take precedence.
p4: Parameter value
Measured value varies depending on p3’s
PID parameter.
Query DT[ p1,p2 (,p3)]?
Example Set external loop 1, group number 1, and PID
parameter SP to 1000.
DT1,1,SP,1000
Description • The parameter setting range differs depending
on the UT used.
• p4 is not needed for the UT320, UT321,
UT350, UT351, and UT420.
Integral time/derivative time settings
Syntax DT p1,p2,p3,p4,p5<terminator>
p1: Loop number (1–16, or 1–4 on the CX1000)
p2: Loop number
1–4 for UT320/UT321/UT350/UT351
1–8 for UT420/UT450/UT520/UT550/UT750
p3: PID parameter name
I: Integral time
D: Derivative time
p4: Turns integration/differentiation On/Off
p5: Parameters when p4 is ON (1–6000)
Query DT[ p1,p2 (,p3)]?
Example Set external loop 2, group number 2, and PID
parameter D to 2000.
DT2,2,D,ON,2000
Description • Given the query, DT p1, p2?, returns the PID
parameter for p2's group number and the
setting values of each parameter.
• The PID parameters that can be set vary
depending on the control mode of the external
groups, and the control output type.
On/off control:
SP, A1-A4, H, DR, PO
Other than On/off control
SP, A1-A4, P, I, D, OH, OL, MR, DR, PO
Position proportional control
SP, A1-A4, H, P, I, D, OH, OL, MR, DR, DB,
PO
Internal switches primary
SP, A1-A4, P, I, D, OH, OL, MR, DR
External Loop Control Parameter Settings
DV External loop control parameter
settings
Syntax DV p1,p2,p3<terminator>
p1: Loop number (1–16, or 1–4 on the CX1000)
p2: Parameter names
MODE/AT/RL/SR/MOUT/SPN
p3: Parameter value
MODE: Switch between manual/automatic/
cascade
0: Automatic operation
1: Manual operation (cascade
control’s primary loop cannot be
selected)
2: Cascade operation (only
cascade control’s secondary
loop can be selected)
AT: Execution and stop of auto tuning
0: Stop auto tuning
1: Execute PID number 1
:
8: Execute PID number 8
9: ALL
For UT320/UT321/UT350/ UT351,
5–8 is not needed.
6.5 Setting Commands (Measurement)