Allen-Bradley SLC 500 Series User Manual

Publication 1747-RM001G-EN-P - November 2008
Proportional Integral Derivative Instruction 9-19
Control Variable Percent (CV%)
CV% (Control Variable Percent) displays the control variable as a percentage.
The range is 0 to 100%. If the AM bit (word 0, bit 1 of the PID Control Block)
is off (automatic mode), this value tracks the control variable (CV) output
being calculated by the PID equation. If the AM bit is on (manual mode), this
value tracks the value that can be manipulated in the control variable (CV) data
word. If no change is made to the CV while in manual mode, the CV% will
display the last value calculated by the PID equation.
Output Limiting Enable (OL)
A value of one enables output limiting to the values defined in Control
Variable Maximum (Word 11) and Control Variable Minimum (Word 12).
A value of zero disables OL (Output Limiting).
Table 9.32 Control Variable Percent Parameter
Output Parameter
Descriptions
Address Data
Format
Range Type User
Program
Access
CV% - Control
Variable Percent
Word 16 word
(INT)
0 to 100 status read only
Table 9.33 Output Limiting Enable Parameter
Output
Parameter
Descriptions
Address Data
Format
Range Type User Program
Access
OL - Output
Limiting Enable
Word 0,
Bit 3
binary 1 = enabled
0 = disabled
control read/write

Allen-Bradley SLC 500 Series Specifications

General

Brand	Allen-Bradley
Model	SLC 500 Series
Category	Controller
Language	English