Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
32 I/O Configuration
Converting Analog Data
The analog input circuits are able to monitor voltage signals and convert
them to digital data. There are five terminals assigned to the input
channels that provide four voltage inputs, and a return signal (commons).
The following table shows sample Analog Signal and Data Word values
using the nominal transfer function formula:
N=Vin x 4095/10 where Vin (analog signal) is in volts (V)
Converting Analog Input Data
Analog inputs convert voltage signals into 12-bit values. To determine an
approximate voltage that an input value represents, use the equation
shown.
For example, if an input value of 1200 is in the input image, the calculated
value is as follows:
Analog Outputs
The MicroLogix 1400 -L32BWAA, -L32AWAA, and -L32BXBA support
2-channel, 12-bit resolution analog output. These channels have 0…10V
DC output range. Output words 4 and 5 contain the value of analog
outputs (Word 4 : analog output channel 0, Word 5 : analog output
channel 1).
Analog to data word conversion
Analog Signal Data Word
0V 0
5V 2048
10V 4095
10V
4095
----------- -
inputvalue× inputvoltage V()=
10V
4095
----------- -
1200× 2.9304 V()=
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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