Chapter 10 Built-in PID Functions
10 - 16
(8) _PIDn_MV_max (PID MV MAXimum limit)
- Setting Area
K DEVICE AREA : K1034+32n
Unit : INT [ -32768 ~ 32767 ]
This limits the maximum MV value of the corresponding loop.
This prevents overload and system errors by limiting the maximum value of the controller output
transferred to the output equipment. This also prevents the transfer of an unwanted value by overflow.
If PIDn_MV_max and PIDn_MV_min are both set to 0, this function does not operate.
(9) _PIDn_MV_min (PID MV MINimum limit)
- Setting Area
K DEVICE AREA : K1035+32n
Unit : INT [ -32768 ~ 32767 ]
This limits the minimum MV value of the corresponding loop.
This prevents system errors by limiting the minimum value of the controller output transferred to the output
equipment. This also prevents the transfer of an unwanted value by overflow.
(10) _PIDn_MV_man (PID MANual MV variable)
- Setting Area
K DEVICE AREA : K1036+32n
Unit : INT [ -32768 ~ 32767 ]
When the corresponding loop is set to manual operation, this designates MV.
If _PIDn_MAN in the common bit area is ON, the PIDn_MV_man value is output as the MV value of the
corresponding loop.
(11) _PIDn_STATE (PID STATE)
- Setting Prohibited
K DEVICE AREA : K1037+32n or 320n ~ 320n
Unit : WORD [ h00 ~ hff ] or BIT
This displays the state or abnomalities of the corresponding loop.
This is located at the address K1037+32n and each of the 16 bits has its own meaning. Only some of the
16 bits are currently in use.
STATE turns On when the corresponding operation occurs and returns Off when it is cleared.
The upper 8 bits of STATE (_PIDn_ALARM 0~_PIDn_ALARM 7) display abnormalities of the loop.
The lower 8 bits of STATE (_PIDn_STATE 0~_PIDn_STATE 7) displays the control state of the loop.
Each bit is assigned as follows.
_PIDn_ALARM 0 (32n): Indicates the operation is skipped because T_s is set too small set.
_PIDn_ALARM 1 (32n): Indicates the K_p value is 0.
_PIDn_ALARM 2 (32n): Indicates the PV variation is limited.
_PIDn_ALARM 3 (32n): Indicates the MV variation is limited.
_PIDn_ALARM 4 (32n): Indicates the maximum MV value is limited.
_PIDn_ALARM 5 (32n): Indicates the minimum MV value is limited.
_PIDn_ALARM 6 (32n): Indicates AT has been canceled abnormally.
_PIDn_STATE 0 (32n): Indicates PID operation is performed. (valid in case of PLC Run)
_PIDn_STATE 1 (32n): Indicates PID AT is being performed.
_PIDn_STATE 2 (32n): Idicates PID AT has been completed.
_PIDn_STATE 3 (32n): Indicates PID is in remode operation by _PIDn_REM_RUM bit.
_PIDn_STATE 4 (32n): Indicates PID is in manual output mode.
_PIDn_STATE 5 (32n): Indicates the PID loop belongs to cascade.
_PIDn_STATE 6 (32n): Indicates the PID loop is the cascade master loop.
_PIDn_STATE 7 (32n): Indicates Aniti Wind-up is in operation during PID operation.
