Uni-I/O™ Modules
Installation Guide
Uni-I/O™ is a family of Input/Output modules that are compatible with the UniStream™
control platform.
This guide provides basic installation information for the UID-0808THS module.
Technical specifications may be downloaded from the Unitronics website.
The UniStream™ platform
comprises CPU controllers, HMI
panels, and local I/O modules
that snap together to form an
all-in-one Programmable Logic
Controller (PLC).
Install Uni-I/O™ modules:
 Onto the back of any
UniStream™ HMI Panel
comprising a CPU-for-Panel.
 Onto a DIN-rail, using a
Local Expansion Kit.
The maximum number of Uni-I/O™ modules that can be connected to a single CPU
controller is limited. For details, please refer to the specification sheets of the UniStream™
CPU or any of the relevant Local Expansion Kits.
Before You Begin
Before installing the device, the installer must:
 Read and understand this document.
 Verify the Kit Contents.
Installation option requirements
If you are installing a Uni-I/O™ module onto:
 A UniStream™ HMI Panel; the Panel must comprise a CPU-for-Panel, installed according
to the CPU-for-Panel installation guide.
 A DIN-rail; you must use a Local Expansion Kit, available by separate order, to integrate
the Uni-I/O™ modules on the DIN-rail into a UniStream™ control system.
Alert Symbols and General Restrictions
When any of the following symbols appear, read the associated information carefully.
The identified danger causes physical and property damage.
The identified danger could cause physical and property damage.
Use caution.
 All examples and diagrams 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 according to local and national standards and regulations.
 This product should be installed only by qualified personnel.
UID-0808THS Installation Guide
 Failure to comply with appropriate safety guidelines can cause severe injury or
property damage.
 Do not attempt to use this device with parameters that exceed permissible levels.
 Do not connect/disconnect the device when power is on.
Environmental Considerations
 Ventilation: 10mm (0.4”) of space is required between the device top/bottom edges
and the enclosure’s walls.
 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,
in accordance with the standards and limitations given in the product’s technical
specification sheet.
 Do not place in water or let water leak onto the unit.
 Do not allow debris to fall inside the unit during installation.
 Install at maximum distance from high-voltage cables and power equipment.
Kit Contents
 1 UID-0808THS module
 4 I/O terminal blocks (2 black and 2 gray)
UID-0808THS Diagram
DIN-rail clips
Provide physical support for CPU and modules. There are two
clips: one at the top (shown), one at the bottom (not shown).
Inputs 0-3
Input connection points
Inputs 4-7
I/O Bus - Left
Left-side Connector
Bus Connector
Slide the Bus Connector Lock to the left, to electrically connect
the Uni-I/O™ module to the CPU or adjacent module.
I/O Bus - Right
Right-Side Connector, shipped covered. Leave covered when not
in use.
Bus Connector
Outputs 4-7
Outputs 0-3
Output connection points
Output LEDs
Green LEDs
Input LEDs
Green LEDs
Status LED
Tricolor LED, Green/Red/Orange
 Refer to the module's specification sheet for LED indications.
Module door
Shipped covered with protective tape to prevent the door from
being scratched. Remove tape during installation.
Screw holes
Enable panel-mounting; hole diameter: 4mm (0.15”).
About the I/O Bus Connectors
The I/O Bus connectors provide the physical and electrical connection points between
modules. The connector is shipped covered by a protective cover, protecting the connector
from debris, damage, and ESD.
The I/O Bus - Left (#4 in diagram) can be connected to either a CPU-for-Panel, a
Uni-COM™ Communication module, to another Uni-I/O™ module or to the End Unit of a
Local Expansion Kit.
The I/O Bus - Right (#6 in diagram) can be connected to another I/O module, or to the
Base Unit of the Local Expansion Kit.
 If the I/O module is located last in the configuration, and nothing is to be
connected to it, do not remove its Bus Connector Cover.
 Turn off system power before connecting or disconnecting any modules or devices.
 Use proper precautions to prevent Electro-Static Discharge (ESD).
Installing a Uni-I/O™ Module onto a UniStream™ HMI Panel
The DIN-rail type structure on the back of the panel provides the physical support for
the Uni-I/O™ module.
1. Check the unit to which you will connect the Uni-I/O™ module to verify that its Bus
Connector is not covered.
If the Uni-I/O™ module is to be the last one in the configuration, do not remove the
cover of its I/O Bus Connector - Right.
2. Open the door of the Uni-I/O™
module and hold it as shown in the
accompanying figure.
3. Use the upper and lower guidetunnels (tongue & groove) to slide
the Uni-I/O™ module into place.
4. Verify that the DIN-rail clips
located at the top and bottom of
the Uni-I/O™ module have
snapped onto the DIN-rail.
UID-0808THS Installation Guide
5. Slide the Bus Connector Lock all the way to
the left as shown in the accompanying figure.
6. If there is already a module located to its
right, complete the connection by sliding the
Bus Connector lock of the adjacent unit to the
7. If the module is the last in the configuration,
leave the I/O bus connector covered.
Removing a Module
1. Turn off the system power.
2. Disconnect the I/O terminals (#2,3,7,8 in the diagram).
3. Disconnect the Uni-I/O™ module from the adjacent units: slide its Bus Connector Lock
to the right. If there is a unit located on its right, slide the lock of this module to the
right as well.
4. On the Uni-I/O™ module, pull the top DIN-rail clip up and the bottom clip down.
5. Open the door of the Uni-I/O™ and hold it with two fingers as shown in the figure on
page 3; then pull it carefully from its place.
Installing Uni-I/O™ modules onto a DIN-rail
To mount modules onto a DIN-rail, follow steps 1-7 in Installing a Uni-I/O™ Module onto a
UniStream™ HMI Panel on page 3.
In order to connect the modules to a UniStream™ controller, you must use a Local
Expansion Kit.
These kits are available with and without power supplies, and with cables of varying
lengths. For complete information, please refer to the installation guide of the relevant
Local Expansion Kit.
Numbering Modules
You can number modules for reference purposes. A set of 20 stickers is provided with
every CPU-for-Panel; use these stickers to number the modules.
 The set contains numbered and blank stickers
as shown in the figure to the left.
 Place them on the modules as shown in the
figure to the right.
 This equipment is designed to operate only at SELV/PELV/Class 2/Limited Power
 All power supplies in the system must include double insulation. Power supply
outputs must be rated as SELV/PELV/Class 2/Limited Power.
 Do not connect either the ‘Neutral’ or ‘Line’ signal of the 110/220VAC to device’s 0V
 Do not touch live wires.
 All wiring activities should be performed while power is OFF.
 Use over-current protection, such as a fuse or circuit breaker, to avoid excessive
currents into the UID-0808THS supply port.
 Unused points should not be connected (unless otherwise specified). Ignoring this
directive may damage the device.
 Double-check all wiring before turning on the power supply.
 To avoid damaging the wire, use a maximum torque of 0.5 N·m (5 kgf·cm).
 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.
Wiring Procedure
Use crimp terminals for wiring; use 26-12 AWG wire (0.13 mm2 –3.31 mm2).
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 a proper connection.
4. Tighten enough to keep the wire from pulling free.
UID-0808THS Connection Points
All wiring diagrams and instructions in this
document refer to the UID-0808THS connection
These points are arranged in four groups of seven
points as shown in the figure to the right.
Two top groups
Input connection points
Two bottom groups
Outputs and power supply connection points
The function of certain I/Os may be adapted via
wiring and software settings.
Inputs: Specified inputs may function as either high
speed or normal digital inputs. The rest can
function only as normal digital inputs.
Outputs: Specified outputs may be used as either
PWM or normal digital outputs. The rest can
function only as normal digital outputs.
UID-0808THS Installation Guide
Wiring Guidelines
In order to ensure that the device will operate properly and to avoid electromagnetic
 Use a metal cabinet. Make sure the cabinet and its doors are properly earthed.
 Use wires that are properly sized for the load.
 Use shielded twisted pair cables for wiring High Speed I/O signals;
do not use the cable shield as a signal common (CM) / return path.
 Route each I/O signal with its own dedicated common wire. Connect each common wire
to its common point as follows:
I0-I3 use CM0.
I4-I7 use CM1.
Normal digital and normal PWM outputs use the 0V as a common point.
Outputs in high speed mode use CM2.
 Individually connect each 0V point in the system to the power supply 0V terminal, unless
otherwise specified.
 Individually connect each functional ground point ( ) to the earth of the system
(preferably to the metal cabinet chassis).
Use the shortest and thickest wires possible: less than 1m (3.3’) in length, minimum
thickness 14 AWG (2 mm2).
 Connect the power supply 0V to the earth of the system.
 Earthing the cables' shield:
Keep shield connections as short as possible.
Ensure shield continuity when extending shielded cables.
Connect the cable shield to the earth of the system - preferably to the metal cabinet
chassis. Note that the shield must be connected only at one end of the cable;
typically, earthing the shield at the UID-0808THS end performs better.
For detailed information, refer to the document System Wiring Guidelines, located in
the Technical Library in the Unitronics’ website.
Wiring the Inputs
The inputs are arranged in two isolated groups:
 I0-I3 share common CM0
 I4-I7 share common CM1
Each group may be wired as sink or source.
Inputs I0, I1, I4, and I5 can be configured as either normal digital inputs or as high speed
inputs that can receive high speed pulse signals from sensors or shaft encoders.
 Inputs I2, I3, I6 and I7 can function only as normal digital inputs.
High Speed Input Modes
Following are the different pin assignments for the high speed channels:
Channel 1
Channel 2
Phase A
Phase B
Phase A
Phase B
 Input modes are set both by wiring and software.
 When connecting pulse sources without a direction signal, leave the direction pin
unconnected. Note that in this configuration, the direction pin cannot be used as
normal input.
Input wiring, sink
Input wiring, source
High Speed Input wiring, sink
High Speed Input wiring, source
UID-0808THS Installation Guide
Wiring the Outputs
Output’s power supply
 The use of any of the outputs requires an external
24VDC power supply as in the accompanying figure.
 In the event of voltage fluctuations or non-conformity to voltage power supply
specifications, connect the device to a regulated power supply.
 Connect a current limiting device in series with outputs O0 and O1. Outputs O2 to
O7 are short-circuit protected.
 Outputs O0 and O1 can be configured as either normal digital outputs or as high speed
PWM outputs.
 Outputs O4 and O5 can be configured as either normal digital outputs or as normal PWM
Refer to the specification sheet for detailed information about PWM output types.
 Outputs O2, O3, O6 and O7 can function only as normal digital outputs.
 Following are the different pin assignments for the PWM channels:
Channel 1
Channel 2
PWM, one output
Normal Digital
Normal Digital
PWM, two outputs
Normal digital/Normal PWM output
Normal digital output
High Speed PWM Outputs
Use shielded cable for wiring O0 or O1
when they are set to operate as High Speed
PWM outputs.
 If Outputs O0 and O1 are to function
as high-speed outputs, connect them
using CM2. Do not connect CM2 to
the system 0V.
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
[DOC27007-A8] 07/13
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