20: PID INSTRUCTION
OPENNET CONTROLLER USER’S MANUAL 20-11
S2+2 Output Manipulated Variable Limit Enable
The output manipulated variable upper limit (S1+16) and the output manipulated variable lower limit (S1+17) are enabled
or disabled using the output manipulated variable limit enable control relay (S2+2).
To enable the output manipulated variable upper/lower limits, turn on S2+2.
To disable the output manipulated variable upper/lower limits, turn off S2+2.
S2+3 Integral Start Coefficient Disable
The integral start coefficient (S1+10) is enabled or disabled using the integral start coefficient disable control relay (S2+3).
To enable the integral start coefficient (S1+10), turn off S2+3; the integral term is enabled as specified by the integral start
coefficient (S1+10).
To disable the integral start coefficient (S1+10), turn on S2+3; the integral term is enabled at the start of the PID action.
S2+4 High Alarm Output
When the process variable (S1+0) is higher than or equal to the high alarm value (S1+14) while the start input for the PID
instruction is on, the high alarm output control relay (S2+4) goes on. When S1+0 is lower than S1+14, S2+4 is off.
S2+5 Low Alarm Output
When the process variable (S1+0) is lower than or equal to the low alarm value (S1+15) while the start input for the PID
instruction is on, the low alarm output control relay (S2+5) goes on. When S1+0 is higher than S1+15, S2+5 is off.
S2+6 Control Output
During auto tuning in auto mode with the auto/manual mode control relay (S2+1) set to off, the control output (S2+6) is
turned on and off according to the AT control period (S1+20) and AT output manipulated variable (S1+22).
During PID action in auto mode with the auto/manual mode control relay (S2+1) set to off, the control output (S2+6) is
turned on and off according to the control period (S1+13) and the output manipulated variable (S1+1) calculated by the
PID action.
In manual mode with the auto/manual mode control relay (S2+1) set to on, the control output (S2+6) is turned on and off
according to the control period (S1+13) and the manual mode output manipulated variable (S1+18).
S2+7 AT Complete Output
The AT complete output control relay (S2+7) goes on when auto tuning is complete or failed, and remains on until reset.
Operating status codes are stored to the operating status control register (S1+2). See page 20-3.
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