Allen-Bradley MicroLogix 1200 Reference Manual

Publication 1762-RM001C-EN-P
Process Control Instruction 19-25
Verifying the Scaling of Your Continuous System
To ensure that your process is linear, and that your equipment is properly
connected and scaled, do the following:
1. Place the PID instruction in MANUAL and enter the following
parameters:
– type:
0
for MinS
– type:
100
for MaxS
– type:
0
for CO%
2. Enter the REM RUN mode and verify that PV=0.
3. Type:
20
in CO%
4. Record the PV = _______
5. Type:
40
in CO%.
6. Record the PV = _______
7. Type:
60
in CO%.
8. Record the PV = _______
9. Type:
80
in CO%.
10. Record the PV = _______
11. The values you recorded should be offset from CO% by the same
amount. This proves the linearity of your process. The following
example shows an offset progression of fifteen.
– CO 20% = PV 35%
– CO 40% = PV 55%
– CO 60% = PV 75%
– CO 80% = PV 95%
If the values you recorded are not offset by the same amount:
•
Either your scaling is incorrect, or
•
the process is not linear, or
•
your equipment is not properly connected and/or configured.
Make the necessary corrections and repeat steps 2-10.

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)