Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

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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Allen-Bradley MicroLogix 1100 Specifications

General

Processor	32-bit
Programming Software	RSLogix 500
Mounting	DIN rail or panel mount
Power Supply	24V DC
Type	Compact PLC
Digital Inputs	12
Digital Outputs	8
Analog Inputs	4 (depending on model)
Analog Outputs	Optional with expansion module
Programming Language	Ladder Logic
Operating Temperature	0 to 55 °C (32 to 131 °F)
Series	MicroLogix