Spectra Unitronics IO-AI8 User manual
IO-AI8 I/O Expansion Module 8 Analog Inputs
The IO-AI8 is an I/O Expansion Module that
can be used in conjunction with specific
Unitronics OPLC controllers.
The module offers 8 analog inputs.
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 Input connection points, AN4 to
AN7
4 Input status indicators
5 Module-to-module connector port
6 Input connection points, AN0 to
AN3
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.
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.
Symbol Meaning Description
Danger The identified danger causes physical
and property damage.
Warning The identified danger can cause
physical and property damage.
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.
IO-AI8 I/O Expansion Module 1/11
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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I8 I/O Expansion Module
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")
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:
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.
1 2
Component identification
1 Module-to-module
connector
2 Protective cap
IO-AI8 I/O Expansion Module 1/11
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”).
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 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.
Analog Inputs
Shields should be connected at the
signal source.
Inputs may be set as either current,
or voltage. To set an input
Use the appropriate wiring as
shown near.
Open the device and set the
jumpers according to the
instructions beginning on page 5.
The adapter and the COM signals
of the analog inputs must be
connected to the same 0V signal.
The COM signals of each channel
are internally shorted.
When set to current/voltage, each 2 inputs share
a common COM signal.
1/11 IO-
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I8 I/O Expansion Module
Opening the Device
Before opening the device, touch a grounded object to discharge any electrostatic charge.
Avoid touching the PCB board directly.
Turn power off and disconnect all leads before opening the device.
In order to change the jumper settings of a specific input, first open the device by prying off its back, using the blade
of a flat-bladed screwdriver. The insertion points for the screwdriver are located on both sides of the module.
1. Open the first side of the device by inserting the blade between the 2 plastic moldings as shown below, then
gently pushing up.
2. Taking care not to damage the cable, open the other side of the device by inserting the blade where shown
below, then gently pushing up.
3. Gently remove the top of the device as
shown.
IO-AI8 I/O Expansion Module 1/11
4. The jumpers are shown at right. Change the
jumper settings as required, in accordance
with the tables shown on the next page.
Jumper Settings
The tables below show how to set a specific jumper to change the functionality of a specific input.
To open the device and access the jumpers, refer to the instructions beginning on page 5.
Caution Incompatible jumper settings and wiring may severely damage the device.
Jumper # Voltage* Current
Input 0 2AB
Input 1 4AB
Input 2 6AB
Input 3 8A B
Input 4 10 A B
Input 5 12 A B
Input 6 14 A B
Input 7 16 A B
* Default factory setting.
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I8 I/O Expansion Module
IO-AI8 Technical Specifications
Max. current consumption 40mA maximum from the adapter’s 5VDC
Typical power consumption 0.2W@5VDC
Status indicator
(RUN) Green LED:
—Lit when a communication link is established between module and OPLC.
—Blinks when the communication link fails.
Analog Inputs
Number of inputs 8 (single-ended) See Note 1.
Input range 0-10V, 0-20mA, 4-20mA. See Note 1.
Input type Either Normal or Fast mode, according to the filter type selected in software
settings
Conversion method Voltage to frequency
Normal mode
Resolution at 0-10V,
0-20mA
14-bit (16384 units)
Resolution at 4-20mA 3277 to16383 (13107 units)
Conversion time 100mSec minimum per input
Fast mode
Resolution at 0-10V,
0-20mA
12-bit (4096 units)
Resolution at 4-20mA 819 to 4095 (3277 units)
Conversion time 25mSec minimum per input
Input impedance >400KΩ—voltage
500Ω—current
Isolation None
Absolute maximum rating ±15V—voltage
±30mA—current
Linearity error 0.04% max of full scale
Error limits 0.4% of input value
Status indicators
(OUT OF RANGE) Red LEDs—Lit when the corresponding input is receiving current or voltage
in excess of the input range. See Note 5.
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)
Dimensions (WxHxD) 80mm x 93mm x 60mm (3.15 x 3.66 x 2.362”)
Weight 150g (5.3 oz)
Mounting Either onto a 35mm DIN-rail or screw- mounted.
Notes:
1. Each input may be set as either voltage (0-10V), or current (0-20mA, 4-20mA) via wiring,
jumper and software settings.
2. The voltage or current value of analog inputs can also indicate faults, as shown in the table below.
Value: 12-bit
(Fast mode)
Value: 14-bit
(Normal mode)
Input Value
Deviates:
-1 -1
Slightly below the input range.
4096 16384
Slightly above the input range.
32767 32767
Greatly above or below the input
range.
IO-AI8 I/O Expansion Module 1/11
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
The information in this document reflects products at the date of printing. Unitronics reserves the right, subject to all applicable laws, at any time, at its sole discretion, and without
notice, to discontinue or change the features, designs, materials and other specifications of its products, and to either permanently or temporarily withdraw any of the forgoing
from the market.
All information in this document is provided "as is" without warranty of any kind, either expressed or implied, including but not limited to any implied warranties of merchantability,
fitness for a particular purpose, or non-infringement. Unitronics assumes no responsibility for errors or omissions in the information presented in this document. In no event shall
Unitronics be liable for any special, incidental, indirect or consequential damages of any kind, or any damages whatsoever arising out of or in connection with the use or
performance of this information.
The tradenames, trademarks, logos and service marks presented in this document, including their design, are the property of Unitronics (1989) (R"G) Ltd. or other third parties and
you are not permitted to use them without the prior written consent of Unitronics or such third party as may own them.
DSP-EXP-AI8 01/11
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