Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
292 Process Control Instruction
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 293.
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
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Allen-Bradley MicroLogix 1100 Specifications

General

Processor	32-bit
Programming Software	RSLogix 500
Mounting	DIN rail or panel mount
Power Supply	24V DC
Type	Compact PLC
Digital Inputs	12
Digital Outputs	8
Analog Inputs	4 (depending on model)
Analog Outputs	Optional with expansion module
Programming Language	Ladder Logic
Operating Temperature	0 to 55 °C (32 to 131 °F)
Series	MicroLogix