Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
332 Process Control Instruction
PID - Proportional
Integral Derivative
Instruction Type: output
It is recommended that you place the PID instruction on a rung without
any conditional logic. If conditional logic exists, the Control Variable
output remains at its last value, and the CVP CV% term and integral term
are both cleared when the rung is false.
The example below shows a PID instruction on a rung with RSLogix 500/
RSLogix Micro programming software.
When programming, the setup screen provides access to the PID
instruction configuration parameters. The illustration below shows the
RSLogix 500/RSLogix Micro setup screen.
PID
PID
PID File PD8:0
Process Variable N7:0
Control Variable N7:1
Setup Screen
PID
Execution Time for the PID Instruction
Controller When Rung Is:
True False
MicroLogix 1400 7.1750 µs 7.0910 µs
TIP
In order to stop and restart the PID instruction, you need to create a
false-to-true rung transition.
0047
B3:0
0
PID
PID
PID File PD8:0
Process Variable N7:0
Control Variable N7:1
Setup Screen
PID
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Allen-Bradley MicroLogix 1400 Specifications

General

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes