Publication 1763-RM001C-EN-P - October 2009
286
Process Control Instruction
Output Limit (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)
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.
Output Parameter
Descriptions
Address
Data
Format
Range
Type
User Program
Access
OL - Output Limit
PD10:0/OL
binary
1 = enabled
0 = disabled
control
read/write
Output Parameter
Descriptions
Address
Data Format Range
Type
User Program
Access
CVH - Control
Variable High Limit
PD10:0.CVH
word (INT)
0 to 100%
control
read/write
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