Allen-Bradley MicroLogix 1200 Reference Manual page 248

19-6 Process Control Instruction
Publication 1762-RM001C-EN-P
Output Limit (OL)
Output Parameter Address
Descriptions
OL - Output Limit PD10:0/OL
An enabled (1) value enables output limiting to the values defined in
PD10:0.CVH (Control Variable High) and PD10.0.CVL (Control Variable
Low).
A disabled (0) value disables OL (Output Limiting).
Control Variable High Limit (CVH)
Output Parameter Address
Descriptions
CVH - Control PD10:0.CVH
Variable High Limit
When the output limit bit (PD10:0/OL) is enabled (1), the CVH (Control
Value High) you enter is the maximum output (in percent) that the control
variable attains. If the calculated CV exceeds the CVH, the CV is set
(overridden) to the CVH value you entered and the upper limit alarm bit
(UL) is set.
When the output limit bit (PD10:0/OL) is disabled (0), the CVH value you
enter determines when the upper limit alarm bit (UL) is set.
If CV exceeds the maximum value, the output is not overridden and the
upper limit alarm bit (UL) is set.
Control Variable Low Limit (CVL)
Output Parameter Address
Descriptions
CVL - Control PD10:0.CVL
Variable Low Limit
When the output limit bit (PD10:0/OL) is enabled (1), the CVL (Control
Value Low) you enter is the minimum output (in percent) that the Control
Variable attains. If the calculated CV is below the minimum value, the CV
is set (overridden) to the CVL value you entered and the lower limit alarm
bit (LL) is set.
When the output limit bit (PD10:0/OL) is disabled (0), the CVL value you
enter determines when the lower limit alarm bit (LL) is set. If CV is below
the minimum value, the output is not overridden and the lower limit
alarm bit (LL) is set.
Data Range Type
Format
binary 1 = enabled control
0 = disabled
Data Format Range
word (INT) 0 to 100%
Data Range Type
Format
word 0 to 100% control
(INT)
User Program
Access
read/write
Type User Program
Access
control read/write
User Program
Access
read/write