Publication 1747-RM001G-EN-P - November 2008
9-20 Proportional Integral Derivative Instruction
Output Maximum (CVH)
When the output limiting bit (OL) word 0, bit 3 of PID Control Block 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 limiting bit (OL) word 0, bit 3 of PID Control Block 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 Minimum (CVL)
When the output limiting bit (OL) word 0, bit 3 of PID Control Block 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 limiting bit (OL) word 0, bit 3 of PID Control Block 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.
Table 9.34 Output Maximum Parameter
Output Parameter
Descriptions
Address Data
Format
Range Type User
Program
Access
CVH - Output
Maximum
Word 11 word (INT) 0 to 100% control read/write
Table 9.35 Output Minimum Parameter
Output
Parameter
Descriptions
Address Data
Format
Range Type User Program
Access
CVL - Output
Minimum
Word 12 word
(INT)
0 to 100% control read/write
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