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Adjustment Level Section 7-4
7-4 Adjustment Level
7-4-1 AT Execute/Cancel (at)
Condition: Operation in automatic mode with 2-PID control.
This parameter executes autotuning.
Function When you execute AT, the optimum PID parameters “proportional band,” “inte-
gral time,” and “derivative time” for the SP during program execution are auto-
matically set by changing the MV to calculate the characteristics of the control
target.
Communications Use the “AT execute/cancel” operation command. Refer to page 81 for infor-
mation.
Example of Use • Normally, this parameter is set to “off”. When you press the Up Key, the
parameter is turned ON and AT is executed.
AT cannot be executed when control has stopped or during ON/OFF con-
trol.
• When AT execution ends, the parameter setting automatically returns to
“
off.”
• The SP flashes if “PV/SP” is monitored during AT.
• Channel settings cannot be changed during AT.
See Also • Related Parameters
“Proportional band” “Integral time” “Derivative time” (adjustment level)
(page 139)
“
PID/OnOff” (initial setting level) (page 145)
7-4-2 Communications Writing (cmwt)
Function This parameter enables/disables writing of parameters to the E5ZN from the
host (e.g., personal computer) by communications.
Communications Use the “communications writing” operation command. Refer to page 80 for
information.
Example of Use Set this parameter to “on” to enable writing and to “off” to disable writing.
See Also • Related Parameters
“Communication unit No.” “Baud rate” (setting switch) (page 3)
“Data bit” “Stop bit” (communications setting level) (page 166) “Parity”
“Communications response wait time” (communications setting level)
(page 167)
7-4-3 Heater Current Value Monitor (ct)
Condition: The “HBA used” parameter for pulse output models must be
set to “ON”.
This parameter measures the current value of the heater from current trans-
former (CT) input to detect heater burnout.
Function This parameter measures and displays the current value of the heater.
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