514 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 13 Special Instructions (FBC, DDT, DTR, PID)
.DATA REAL[17] The .DATA member stores:
Element Description
.DATA[0] Integral accumulation
.DATA[1] Derivative smoothing temporary value
.DATA[2] Previous .PV value
.DATA[3] Previous .ERR value
.DATA[4] Previous valid .SP value
.DATA[5] Percent scaling constant
.DATA[6] .PV scaling constant
.DATA[7] Derivative scaling constant
.DATA[8] Previous .KP value
.DATA[9] Previous .KI value
.DATA[10] Previous .KD value
.DATA[11] Dependent gain .KP
.DATA[12] Dependent gain .KI
.DATA[13] Dependent gain .KD
.DATA[14] Previous .CV value
.DATA[15] .CV descaling constant
.DATA[16] Tieback descaling constant
.EN BOOL Enabled
.CT BOOL Cascade type (0=slave; 1=master)
.CL BOOL Cascade loop (0=no; 1=yes)
.PVT BOOL Process variable tracking (0=no; 1=yes)
.DOE BOOL Derivative of (0=PV; 1=error)
.SWM BOOL Software manual mode (0=no-auto; 1=yes- sw manual)
.CA BOOL Control action (0 means E=SP-PV; 1 means E=PV-SP)
.MO BOOL Station mode (0=automatic; 1=manual)
.PE BOOL PID equation (0=independent; 1=dependent)
.NDF BOOL No derivative smoothing
(0=derivative smoothing filter enabled; 1=derivative smoothing filter disabled)
.NOBC BOOL No bias back calculation
(0=bias back calculation enabled; 1=bias back calculation disabled)
.NOZC BOOL No zero crossing deadband
(0=deadband is zero crossing; 1=deadband is not zero crossing)
.INI BOOL PID initialized (0=no; 1=yes)
.SPOR BOOL Setpoint out of range (0=no; 1=yes)
.OLL BOOL CV is below minimum output limit (0=no; 1=yes)
.OLH BOOL CV is above maximum output limit (0=no; 1=yes)
.EWD BOOL Error is within deadband (0=no; 1=yes)
.DVNA BOOL Deviation is alarmed low (0=no; 1=yes)
Mnemonic: Data Type Description
To Next Page
Loading...
Need help?
General
