Unitronics IO-LC1 User manual

Unitronics Industrial Automation 1
IO-LC1, IO-LC3 I/O Expansion Modules 1-3 Loadcell Inputs, 1 Digital In, 2 Out
The IO-LC1 and IO-LC3 are I/O
Expansion Modules that can be used in
conjunction with specific Unitronics OPLC
controllers.
IO-LC1 offers 1 Loadcell input; IO-LC3
module offers 3 Loadcell inputs. Both
modules offer 1 PNP (source) input and 2
short-circuit protected PNP (source)
outputs with optional setpoint action that is
defined via software settings.
The interface between the module and the
OPLC is provided by an adapter.
The module may either be snap-mounted
on a DIN rail, or screw-mounted onto a
mounting plate.
Component identification
1 Module-to-module connector
2 Communication status indicator
3 Power and I/O connection points
4 I/O connection points (IO-LC3 only)
5 Power and I/O status indicators
6 Module-to-module connector port
Note: The single Loadcell input offered by IO-LC1 is marked
LC and is located where the input LC2 is shown above.
 Before using this product, it is the responsibility of the user to read and understand this document and
any accompanying documentation.
 All examples and diagrams shown herein are intended to aid understanding, and do not guarantee
operation. Unitronics accepts no responsibility for actual use of this product based on these examples.
 Please dispose of this product in accordance with local and national standards and regulations.
 Only qualified service personnel should open this device or carry out repairs.
User safety and equipment protection guidelines
This document is intended to aid trained and competent personnel in the installation of this equipment as
defined by the European directives for machinery, low voltage, and EMC. Only a technician or engineer trained
in the local and national electrical standards should perform tasks associated with the device’s electrical wiring.
Symbol Meaning Description
Danger The identified danger causes physical
and property damage.
Warning The identified danger can cause
physical and property damage.
Symbols are used to highlight
information relating to the user’s
personal safety and equipment
protection throughout this document.
When these symbols appear, the
associated information must be read
carefully and understood fully. Caution Caution Use caution.
 Failure to comply with appropriate safety guidelines can result in severe personal injury or
property damage. Always exercise proper caution when working with electrical equipment.

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 Check the user program before running it.
 Do not attempt to use this device with parameters that exceed permissible levels.
 To avoid damaging the system, do not connect / disconnect the device when the power is on.
Environmental Considerations
 Do not install in areas with: excessive or conductive dust, corrosive or flammable gas,
moisture or rain, excessive heat, regular impact shocks or excessive vibration.
 Leave a minimum of 10mm space for ventilation between the top and bottom edges of the
device and the enclosure walls.
 Do not place in water or let water leak onto the unit.
 Do not allow debris to fall inside the unit during installation.
Mounting the Module
DIN-rail mounting
Snap the device onto the DIN rail as shown below; the module will be squarely situated on the DIN rail.
60mm
(2.362")
3.5mm
(0.137")
14mm
(0.55")
80mm
(3.15")
93mm
(3.66")
44.5mm
(1.75")

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Screw-Mounting
The figure below is not drawn to scale. It may be used as a guide for screw-mounting the module.
Mounting screw type: either M3 or NC6-32.
4mm
5.8mm
(0.228")
85mm
(3.346")
80mm
(3.15")
68.4mm
(2.693")
93mm
(3.66")
4mm (x2)
(0.16")
(0.16")

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Connecting Expansion Modules
An adapter provides the interface between the OPLC and an expansion module. To connect the I/O module to
the adapter or to another module:
1. Push the module-to-module connector into the port located on the right side of the device.
Note that there is a protective cap provided with the adapter. This cap covers the port of the final
I/O module in the system.
 To avoid damaging the system, do not connect or disconnect the device when the
power is on.
Component identification
1 Module-to-module connector
2 Protective cap
1 2
Wiring
 Do not touch live wires.
 Unused pins should not be connected. Ignoring this directive may damage the device.
 Do not connect the ‘Neutral or ‘Line’ signal of the 110/220VAC to the device’s COM pins.
 Double-check all wiring before turning on the power supply.
Wiring Procedures
Use crimp terminals for wiring; use 26-12 AWG wire (0.13 mm 2–3.31 mm2) for all wiring purposes.
1. Strip the wire to a length of 7±0.5mm (0.250–0.300 inches).
2. Unscrew the terminal to its widest position before inserting a wire.
3. Insert the wire completely into the terminal to ensure that a proper connection can be made.
4. Tighten enough to keep the wire from pulling free.
 To avoid damaging the wire, do not exceed a maximum torque of 0.5 N·m (5 kgf·m).
 Do not use tin, solder, or any other substance on stripped wire that might cause the wire strand to break.
 Install at maximum distance from high-voltage cables and power equipment.
I/O Wiring—General
 Input or output cables should not be run through the same multi-core cable or share the same wire.
 Allow for voltage drop and noise interference with input lines used over an extended distance. Use wire
that is properly sized for the load.

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External Power Supply
All of the IO-LC1, IO-LC3 I/O signals are isolated from the controller bus, but are not isolated from the power
supply input. If required, you can provide full isolation by using a separate isolated power-supply.
1. Connect the "positive" cable to the "+V" terminal, and the "negative" cable to the "0V" terminal.
 Do not connect the 'Neutral' or 'Line' signal of the 110/220VAC to any of the module's
terminals.
 In case of voltage fluctuations or non-conformity to voltage power supply
specifications, connect the module to a regulated power supply.
Earthing the module
To maximize system performance, avoid electromagnetic interference by earthing the module.
1. Connect one end of a wire, 14 AWG, to the chassis signal; connect the other end to the cabinet chassis.
This assumes that the cabinet is properly earthed. If this is not the case, do not earth the module.
Caution
 The wire used to earth the module must not exceed 8 cm in length. If your conditions
do not permit this, do not earth the module.
 Do not earth the module via the Loadcell cable shield.
External power supply and Digital I/O wiring
Digital I/Os
 Refer to External power supply and Digital I/O wiring above for wiring guidelines.
See Earthing the module
guidelines above.

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Loadcell Inputs
 Use 6 or 4 wire shielded cable (6 wire is recommended).
 The cable shield should be connected ONLY to the Loadcell chassis. The shield at the other end of the
cable should be left unconnected.
 Refer to the figures below for wiring guidelines.
6 wire Loadcell wiring 4 wire Loadcell wiring

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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 350ΩLoadcell 45mA 30mA
4 x 350ΩLoadcells 70mA 45mA
12 x 350ΩLoadcells 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 350ΩLoadcells)
Total 200mA maximum (up to 12 x 350ΩLoadcells)
Short circuit protection Yes, up to 1 minute
A/D Converter
Conversion method Sigma–Delta
Resolution 24 bits
Conversion period 12.5msec (80Hz)

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Linearity error 0.01% maximum of full scale
Common-mode rejection >100dB @ DC, 50Hz, 60Hz
Offset drift 100nV / °C typ.
Gain drift 3ppm / °C typ.
Calibration and Zero —2 to 12 calibration-points (zero-point not required), direct/indirect point
addressing for editing and deleting calibrated points.
—Zero and tare acquisition and/or editing.
—Auto zero tracking
Filter Adjustable settling time up to 24 sec. See Note 2 for details.
Loadcell input values Either one or two independent values, signed 16 or 24 bit. Each weight/strain
value may be represented in a different mode; representation modes are
selected via software.
Polarity Fully bipolar operation – weight/strain values can be either positive or negative.
Representation modes Net, Gross, Net Min, Net Max, uV/V or A/D Raw Value.
*When uV/V is selected for one value, both values will be represented in uV/V.
**The Net and Gross values may also indicate connection problems. See Note 3
for details.
Rounding The Net, Gross, Net Min and Net Max values may be rounded by 1, 2, 5, 10,
20, 50 or 100.
Effective resolution See Effective Resolution, page 10.
Status indicators
(OUT OF RANGE) Red LEDs:
—Lit when the corresponding Loadcell is not connected to the input, or when
the input analog value exceeds the permissible range. See Note 3 for
details.
—Blinks when the external power-supply is not detected. See Note 4 for details.
Digital Input
Number of inputs 1
Input type pnp (source)
Galvanic isolation
Dig. input to ext. supply No
Dig. input to bus Yes
Dig. input to Loadcell No
Dig. input to digital outputs No
Nominal input voltage 12 / 24VDC
Input voltage 0-5VDC for Logic '0'
9-28.8VDC for Logic '1'
Input current 5.5mA @ 12VDC,
11.5mA @ 24VDC
Response time 10mSec typical
Status indicator
(IN) Green LED—Lit when the input is active. See Note 5.
Digital Outputs
Number of outputs 2 pnp (source)
Output type P-MOSFET (open drain)
Galvanic isolation
Dig. output to ext. pwr
supply
No
Dig. output to bus Yes
Dig. output to Loadcell No
Dig. output to digital input No

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Output current 0.3A maximum per output
Maximum frequency 20Hz (resistive load)
0.5Hz (inductive load)
ON voltage drop 0.5V maximum
Short circuit protection Yes
Response time 10mSec typical
Operating modes Both outputs can be independently configured, via the software, to operate in
one of the following modes:
Direct ladder control The output functions like a standard digital output, and is directly controlled
via ladder software. This is the default mode at power-up.
Setpoint The output is linked to one of the active Loadcell input values and operates
according to parameters set by the application software.
Status indicators
(OUT) Red LEDs—Lit when the corresponding output is active.
Environmental IP20/NEMA1
Operating temperature 0°to 50°C (32 to 122° F)
Storage temperature -20°to 60°C (-4 to 140° F)
Relative Humidity (RH) 5% to 95% (non-condensing)
Mechanical
Dimensions (WxHxD) 80mm x 93mm x 60mm (3.15 x 3.66 x 2.362”)
Weight 170g (6oz)
Mounting Either onto a 35mm DIN-rail or screw- mounted.
Notes:
1. The maximum current consumption does not provide for output requirements.
The additional current requirement of the outputs must be added.
2. The minimum settling times and settling time resolutions are: 12.5ms for one active channel, 675ms for two
active channels and 1,012.5ms for three active channels
3. The following connection-problems will cause the corresponding OUT OF RANGE LED to light up:
- Disconnection of one of the signal (±SG) lines
- Disconnection of one or both of the sense (±SN) lines
When the Out Of Range LED is lit, the Out Of Range bit of the corresponding Loadcell Status Message turns
ON, and the Loadcell's Net and Gross values will be set according as follows:
Normal Resolution High Resolution
Under-Range: -215 = -32,768 = 8000 Hex -223 = -8,388,608 = FF80 0000 Hex
Over-Range: 215 - 1 = 32,767 = 7FFF Hex 223 - 1 = 8,388,607 = 007F FFFF Hex
4. When the external power-supply cannot be detected, the No Power Bit in all of the Loadcell Status
Messages turns ON.
5. The input's LED light up only when a communication link is established between module and OPLC.
6. AC excitation has the advantage of lower offset drift errors, improving performance over time and in the
presence of ambient temperature changes. To minimize the impact of offset drift errors in your loadcell
application, the use of AC excitation is recommended.

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Effective Resolution
Gain = 0 (Total input span = -20mV to +20mV)
 The effective resolution depends on several electrical parameters including the gain setting, the input
span that is used (usually 10mV for 2mV/V Loadcells or 15mV for 3mV/V Loadcells), the amount of
uncompensated differential offset, and the applied input noise.
 The number of Loadcell inputs used per expansion module affects the sampling rate for each of them,
resulting in lower filter depth and effective resolution.
 The filter settling time can be programmed separately for each Loadcell input without affecting the
other(s).

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Addressing I/Os on Expansion Modules
Inputs and outputs located on I/O expansion modules that are connected to an OPLC are assigned
addresses that comprise a letter and a number. The letter indicates whether the I/O is an input (I) or an
output (O). The number indicates the I/O’s location in the system. This number relates to both the position of
the expansion module in the system, and to the position of the I/O on that module.
Expansion modules are numbered from 0-7 as shown in the figure below.
01234567
Expansion module
identification number
Adapter
The formula below is used to assign addresses for I/O modules used in conjunction with the OPLC.
X is the number representing a specific module’s location (0-7). Y is the number of the input or output on that
specific module (0-15).
The number that represents the I/O’s location is equal to:
32 + x • 16 + y
Examples
 Input #3, located on expansion module #2 in the system, will be addressed as I 67,
67 = 32 + 2 • 16 + 3
 Output #4, located on expansion module #3 in the system, will be addressed as O 84,
84 = 32 + 3 • 16 + 4.
EX90-DI8-RO8 is a stand-alone I/O module. Even if it is the only module in the configuration, the EX90-DI8-
RO8 is always assigned the number 7.
Its I/Os are addressed accordingly.
Example
 Input #5, located on an EX90-DI8-RO8 connected to an OPLC will be addressed
as I 149, 149 = 32 + 7 • 16 + 5

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About Unitronics
Unitronics Industrial Automation Systems has been producing PLCs, automation software and accessory
devices since 1989.
Unitronics’ OPLC controllers combine full-function PLCs and HMI operating panels into single, compact units.
These HMI + PLC devices are programmed in a single, user-friendly environment. Our clients save I/O points,
wiring, space, and programming time; elements that translate directly into cost-efficiency.
Unitronics supports a global network of distributors and sales representatives, as well as a U.S. subsidiary.
For more information regarding Unitronics products, contact your distributor, Unitronics headquarters via email:
[email protected], or visit the Unitronics website at http://www.unitronics.com/.
Under no circumstances will Unitronics be liable or responsible for any consequential damage that may
arise as a result of installation or use of this equipment, and is not responsible for problems resulting
from improper or irresponsible use of this device.
No part of this document may be used for any purpose other than for the purposes specifically indicated
herein nor may it be reproduced or transmitted in any form or by any means, electronic or mechanical,
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The information appearing in this document is for general purposes only. Unitronics makes no warranty
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