Allen-Bradley MicroLogix 1200 Reference Manual

Publication 1762-RM001C-EN-P
Process Control Instruction 19-3
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
programming software.
When programming, the setup screen provides access to the PID
instruction configuration parameters. The illustration below shows the
RSLogix 500 setup screen.
PID
PID
PID File PD8:0
Process Variable N7:0
Control Variable N7:1
Setup Screen
PID
Table 19.1 Execution Time for the PID Instruction
Controller When Rung Is:
True False
MicroLogix 1200 295.8
µ
s11.0
µ
s
MicroLogix 1500 251.8
µ
s8.9
µ
s
NOTE
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

Allen-Bradley MicroLogix 1200 Specifications

General

Series	MicroLogix 1200
Type	Programmable Logic Controller (PLC)
Mounting	DIN rail or panel mount
Programming Language	Ladder Logic
Programming Software	RSLogix 500
I/O Points	Up to 40
Communication Ports	RS-232, RS-485
Memory	6 KB user memory
Power Supply	24V DC or 120/240V AC
Expansion	Supports expansion I/O modules
Operating Temperature	0°C to 55°C (32°F to 131°F)
Dimensions	90 mm x 110 mm
Weight	0.5 kg (1.1 lbs)