Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
Process Control Instruction 343
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…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 344.
Tuning Parameter
Descriptions
Address Data
Format
Range Type User Program
Access
ZCD - Zero Crossing
Deadband
PD10:0.ZCD word (INT) 0…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…+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…+32,767 status read only
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Allen-Bradley MicroLogix 1400 Specifications

General

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes