Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
Process Control Instruction 293
Automatic / Manual (AM)
The auto/manual bit can be set or cleared by instructions in your ladder
program. When off (0), it specifies automatic operation. When on (1), it
specifies manual operation. In automatic operation, the instruction
controls the control variable (CV). In manual operation, the user/control
program controls the CV. During tuning, set this bit to manual.
Control Mode (CM)
Control mode, or forward-/reverse-acting, toggles the values E=SP-PV and
E=PV-SP.
Forward acting (E=PV-SP) causes the control variable to increase when
the process variable is greater than the setpoint.
Reverse acting (E=SP-PV) causes the control variable to decrease when
the process variable is greater than the setpoint.
PV in Deadband (DB)
This bit is set (1) when the process variable is within the zero-crossing
deadband range.
Tuning Parameter
Descriptions
Address Data Format Range Type User Program
Access
AM - Automatic/Manual PD10:0/AM binary (bit) 0 or 1 control read/write
TIP
Output limiting is also applied when in manual.
Tuning Parameter
Descriptions
Address Data Format Range Type User Program
Access
CM - Control Mode PD10:0/CM binary (bit) 0 or 1 control read/write
Tuning Parameter
Descriptions
Address Data Format Range Type User Program
Access
DB - PV in Deadband PD10:0/DB binary (bit) 0 or 1 status read/write
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Allen-Bradley MicroLogix 1100 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1100
Category	Controller
Language	English