Allen-Bradley MicroLogix 1200 Reference Manual

Publication 1762-RM001C-EN-P
Process Control Instruction 19-11
Zero Crossing Deadband (ZCD)
The deadband extends above and below the setpoint by the value
entered. The deadband is entered at the zero crossing of the process
variable and the setpoint. This means that the deadband is in effect only
after the process variable enters the deadband and passes through the
setpoint.
The valid range is 0 to the scaled maximum, or 0 to 16,383 when no
scaling exists.
Feed Forward Bias (FF)
The feed forward bias is used to compensate for disturbances that may
affect the CV output.
Scaled Error (SE)
Scaled error is the difference between the process variable and the
setpoint. The format of the difference (E = SP-PV or E = PV-SP) is
determined by the control mode (CM) bit. See Control Mode (CM) on
page 19-12.
Tuning Parameter
Descriptions
Address Data
Format
Range Type User Program
Access
ZCD - Zero Crossing
Deadband
PD10:0.ZCD word (INT) 0 to 32,767 control read/write
Tuning Parameter
Descriptions
Address Data
Format
Range Type User Program
Access
FF - Feed Forward
Bias
PD10:0.FF word
(INT)
-16,383 to +16,383 control read/write
Tuning Parameter
Descriptions
Address Data
Format
Range Type User Program
Access
SE - Scaled Error PD10:0.SE word (INT) -32,768 to +32,767 status read only

Allen-Bradley MicroLogix 1200 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1200
Category	Control Unit
Language	English