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Automatic / Manual (AM)
Tuning Parameter
Descriptions
AM - Automatic/Manual
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.
TIP
Control Mode (CM)
Tuning Parameter
Descriptions
CM - Control Mode
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)
Tuning Parameter
Descriptions
DB - PV in Deadband
This bit is set (1) when the process variable is within the zero-crossing
deadband range.
Address
Data Format Range
PD10:0/AM
binary (bit)
Output limiting is also applied when in manual.
Address
Data Format
PD10:0/CM
binary (bit)
Address
Data Format
PD10:0/DB
binary (bit)
Process Control Instruction
Type
User Program
Access
0 or 1
control
read/write
Range
Type
User Program
Access
0 or 1
control
read/write
Range
Type
User Program
Access
0 or 1
status
read/write
Publication 1763-RM001C-EN-P - October 2009
293
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