3. AIAO Units
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1-71
3.2 ELCM
Series
3.2.1 ELCM-AN04ANNN
3.2.1.1 The
A/D
Conversion
In industrial automation, many devices transmit data via analog signals. The most common
analog signals are -10 ~ 10V and -20 ~ 20mA. The analog input modules convert these analog
signals to digital values for the ELC controller..
For example, the voltage -10 ~ 10V is first converted into values -32,000 ~ +32,000 decimal by
an A/D module. The ELC reads/writes to the control registers (CR) in the analog modules with
FROM/TO instructions.
3.2.1.2 Introduction
This analog input module has 4 analog signal inputs (voltage or current) and converts them into
16-bit decimal values with 14 bit resolution. The ELC program reads/writes data to/from the
ELC-AN04ANNN analog input module by using the FROM / TO instructions.
(Refer to special registers D9900 ~ D9999).
3.2.1.3 Specifications
Functions Specification
ELCM-AN04ANNN
Voltage input
Current input
Power supply voltage 24 VDC (20.4VDC ~ 28.8VDC) (-15% ~ +20%)
Connector
European standard fixed terminal block (Hole diameter: 5mm)
Analog input channel 4 channels
Range of analog input ±10V
±5V
±20mA
0~20mA
4~20mA
Range of digital
conversion
±32,000 ±32,000 ±32,000 0~32,000
0~32,000
Max./Min. output
range of digital data
±32,384 ±32,384 ±32,384 -384~+32,384 -384~+32,384
Resolution
14 bits
20V/64000
14 bits
10V/64000
14 bits
40mA/64000
14 bits
20mA/32000
14 bits
16mA/32000
Input impedance
> 200 K
Ω
250
Ω
Overall accuracy
±
0.5% when in full scale (25°C, 77°F)
±
1% when in full scale within the range of 0 ~ 55°C (32 ~ 131°F)
Response time
3 ms / all channels
Isolation
Optical coupler isolation between digital circuits and analog circuits. No isolation
among analog channels.
500VDC between digital circuits and Ground
500VDC between analog circuits and Ground
500VDC between analog circuits and digital circuits
500VDC between 24VDC and Ground
Range of absolute
input
±15V ±32mA
Digital data format
16 significant bits out of 16 bits are available; in 2’s complement
