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Allen-Bradley MicroLogix 1000 User Manual

Allen-Bradley MicroLogix 1000
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Preface
MicroLogix 1000 Programmable Controllers User Manual
F–4
Example Ladder Diagram
The following ladder diagram uses 3 internal bits to perform the calibration
procedure. CAL_LO_ENABLE causes the ladder to capture the 4 mA calibration
value and CAL_HI_ENABLE causes the ladder to capture the 20 mA calibration
value. CALIBRA
TE causes the ladder diagram to scale the hi and low values to the
nominal values, which provides the slope and of
fset values used to calibrate the
analog input channel.
Once the calibration procedure is complete, set the CONVERSION ENABLE bit to
a “1”. The calibration numbers can then be used to scale the raw analog data. The
corrected analog input data will be placed in memory location
ANALOG_SCALED.
The following symbols are used in this example:
CAL_LO_ENABLE =
B3/500
CAL_HI_ENABLE
= B3/501
CALIBRATE
= B3/502
CONVERSION ENABLE
= B3/503
ANALOG_IN = I:0.4
LO_CAL_VALUE
= N7:90
HI_CAL_VALUE
= N7:91
CAL_SPAN
= N7:92
SCALE_HI
= N7:93
SCALE_LOW
= N7:94
SCALE_SPAN
= N7:95
SLOPE_X10K
= N7:97
OFFSET
= N7:100
ANALOG_SCALED
= N7:101
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Allen-Bradley MicroLogix 1000 Specifications

General IconGeneral
Communication PortsRS-232
Power Supply24V DC or 120/240V AC
Programming SoftwareRSLogix 500
ManufacturerAllen-Bradley
CategoryController
SeriesMicroLogix
Programming LanguageLadder Logic
Input Voltage24V DC or 120/240V AC
I/O Points10 to 32 points
Processor Type8-bit
Operating Temperature0…55 °C (32…131 °F)
Processor8-bit

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