4/04
IO-LC1, IO-LC3
I / O E x p a n s i o n M o d u l e s
Unitronics Industrial Automation
7
IO-LC1, IO-LC3 Technical Specifications
External Power-Supply
Nominal operating voltage
12 / 24VDC
Operating voltage range
10.2 to 28.8VDC
Power Consumption
Max. current consumption
From the adapter’s 5VDC
60mA
From external power-
supply
At 12V
At 24V
One 350
Ω
Loadcell
45mA
30mA
4 x 350
Ω
Loadcells
70mA
45mA
12 x 350
Ω
Loadcells
140mA
80mA
See Note 1 for details
Max. total internal power
dissipation
At 12V
At 24V
1.0W 1.2W
Status Indicator
(RUN)
Green LED:
—Lit when a communication link is established between module and OPLC.
—Blinks when the communication link fails.
Loadcell Inputs
Number of inputs
3 for IO-LC3, 1 for IO-LC1
Galvanic isolation
Loadcell to ext. pwr supply
No
Loadcell to bus
Yes
Loadcell to digital input
No
Loadcell to digital outputs
No
Input voltage ranges
Signal (+SG & -SG)
Differential
Gain Setting (S.W. selectable)
*
Nominal Span
0
-20mV to +20mV
1
-80mV to +80mV
*
Offset compensation (S.W. selectable) can shift span by approx. -77.5mV to
+77.5mV (2.5mV steps).
Common-Mode 1.5Vmin to 3.5Vmax (relative to the 0V terminal voltage)
Sense (+SN & -SN)
Differential -5V to +5V nominal
Common-Mode 0Vmin to 5Vmax (relative to the 0V terminal voltage)
Excitation output (+E & -E)
Excitation type
Software selectable: DC or AC (Alternating polarity square wave, see Note 6)
Differential output voltage
5V nominal
4.70Vmin to 5.20Vmax
Output current
Per Loadcell input 200mA maximum (up to 12 x 350
Ω
Loadcells)
Total 200mA maximum (up to 12 x 350
Ω
Loadcells)
Short circuit protection
Yes, up to 1 minute
A/D Converter
Conversion method
Sigma–Delta
Resolution
24 bits
Conversion period
12.5msec (80Hz)
