Publication 1766-RM001A-EN-P - October 2008
Process Control Instruction 337
Control Variable Low Limit (CVL)
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.
Output Parameters
The table below shows the output parameter addresses, data formats, and
types of user program access. See the indicated pages for descriptions of
each parameter.
Control Variable (CV)
The CV (Control Variable) is user-defined. See the ladder rung below.
Output Parameter
Descriptions
Address Data
Format
Range Type User Program
Access
CVL - Control
Variable Low Limit
PD10:0.CVL word
(INT)
0…100% control read/write
Output Parameter Descriptions Address Data Format Range Type User Program
Access
For More
Information
CV - Control Variable User-defined word (INT) 0…16,383 control read/write 337
CVP - Control Variable Percent PD10:0.CVP word (INT) 0…100 control read/write 338
SPV - Scaled Process Variable PD10:0.SPV word (INT) 0…16383 status read only 338
Output Parameter
Descriptions
Address Data
Format
Range Type User Program
Access
CV - Control Variable User-defined word (INT) 0…16,383 control read/write
0000
PID
PID
PID File PD10:0
Process Variable N7:0
Control Variable N7:1
Setup Screen
PID
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