C7-3
IM 34M06H62-02E 2nd Edition : June 2008-00
When OT = “2: Heating/Cooling PID Control”:
The control output value and the cooling control output value bump to 0.0%. However, if
the Dead Band (DB) is negative, the control output value may bump to a value other than
0.0% (defined by the setting).
In Automatic mode, control and computation begins with the control output value
immediately after the switch as the origin (if the Integral Time (TI) is set to ‘0: OFF’, the
control output bumps to the new value).
In Manual mode, the computed control output (HOUT, COUT) values are copied to the
manual output (MOUT, MOUTC) registers when switching from Stop mode to Run mode.
Figure C7.4 Switching to Run Mode in Heating/Cooling PID Control
When OT = “3: Heating/Cooling On/Off Control”:
In Automatic mode, the output values are determined by the PV and CSP, independent of
the output values in Stop Mode.
In Manual mode, the computed control output (HOUT, COUT) values are copied to the
manual output (MOUT, MOUTC) registers when switching from Stop mode to Run mode.
Figure C7.5 Switching to Run Mode in Heating/Cooling On/Off Control
For all control output states, the operation of the secondary loop in Cascade mode is the
same as that in Automatic mode.
Table C7.2 Parameters Related to Run/Stop Switching
Data Position Number
Symbol Description Unit
Data Range
Default
Value
Attribute
Stored
Loop1 Loop2 Loop3 Loop4
217 417 617 817 1.POUT Preset output % -50 to 1050 (-5.0 to 105.0%) 0 RW
237 437 637 837 2POUT Preset output % -50 to 1050 (-5.0 to 105.0%) 0 RW
257 457 657 857 3.POUT Preset output % -50 to 1050 (-5.0 to 105.0%) 0 RW
277 477 677 877 4.POUT Preset output % -50 to 1050 (-5.0 to 105.0%) 0 RW
218 418 618 818 1.POUT.C Cooling preset output % -50 to 1050 (-5.0 to 105.0%) 0 RW
238 438 638 838 2.POUT.C Cooling preset output % -50 to 1050 (-5.0 to 105.0%) 0 RW
258 458 658 858 3.POUT.C Cooling preset output % -50 to 1050 (-5.0 to 105.0%) 0 RW
278 478 678 878 4.POUT.C Cooling preset output % -50 to 1050 (-5.0 to 105.0%) 0 RW
121 321 521 721 RUN/STP Run/Stop Selection None 0: Stop 1: Run 0 RW —
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