283
AT (Expansion Mode) Section 3-6
Auto-tuning can be started by taking the following procedure on the Program-
ming Console.
Default: SP = 100
°C and PV = 98 °C
Write the AT start code “CF00” to the output word of the relevant loop and
confirm that the input word will become CF00.
Set SP to 100
°C again.
To cancel auto-tuning, use the code “CF01” instead and follow the above pro-
cedure.
Note 1. To put the Temperature Control Unit into expansion mode, change the
jumper pin on the side of the Unit from 2 and 3 to 1 and 2.
2. Auto-tuning is not available if the half period exceeds 9999 s (approximate-
ly 2 hours 45 minutes). If the half cycle exceeds 9999 s, no measurement
is possible and the Temperature Control Unit will restart auto-tuning auto-
matically.
3. If the output word data is left as CF00, auto-tuning will be repeated. Be
sure to return it to the set value.
3-6-1 Manual Settings (Expansion Mode)
When the Temperature Control Unit is turned ON, the SP will be allocated to
the output word and the PV will be allocated to the PV word. By changing the
contents of the allocation, the following six set values can be read or written.
? ?
'&
? ?
+. +.
? ?
'&
Parameter Setting range Unit Default Remarks
Set point –999 to 9,999 °C/°F 0 ---
Proportional band 0.1 to 999.9 °C/°F 40.0 ---
Integral time 0 to 3999 Seconds 240 ---
Derivative time 0 to 3999 Seconds 40 ---
Hysteresis 0.1 to 999.9 °C/°F 0.8 ---
Control period 1 to 99 Seconds 2 When SW1-6 is set to ON, the value can be changed.
In this case, the default is “2.”
Input shift value –99.9 to 999.9 °C/°F 0.0 ---
Process value –999 to 9,999 °C/°F --- Read-only
Manipulated variable 0.1 to 100.0 % --- Read-only
Status --- --- --- Read-only
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