Unitronics Vision 120 OPLC User manual

User Guide
03/06V120-21-G1

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i
Preface
This guide contains essential information for Vision120 OPLC™ users.
Warnings and Safety Guidelines
Read this section carefully before installing and operating the device.
Chapter 1: Overview
Contains a general description of the device’s features and functions.
Chapter 2: Mounting
Describes mounting considerations and procedures.
Chapter 3: Power Supply
Explains wiring procedures and considerations.
Chapter 4: I/Os
Presents information regarding on-board I/Os and I/O expansion modules.
Chapter 5: Communications
Contains program download instructions as well as information on serial communications
and CANbus networking, including wiring.
Chapter 6: Information Mode
Describes how to use Information Mode to view runtime values, set timer values, reset and
initialize the controller and check I/O module status.
Appendix A: System Data Types
Contains tables showing internal system elements.
Appendix B: New PLC Users
Provides information for new PLC users.

Vision120 OPLC™ User Guide
ii
Table of Contents
Preface .......................................................................................................................................i
Guidelines for user safety and equipment protection ........................................................... iii
Warnings............................................................................................................................... iv
Chapter 1: Overview ................................................................................................................5
Introducing the Vision120 OPLC™ .......................................................................................5
Technical Description ....................................................................................................................... 6
Safety Guidelines ............................................................................................................................. 8
Chapter 2: Mounting ................................................................................................................9
Before You Begin...................................................................................................................9
Safety and Environmental Guidelines .................................................................................10
Panel Mounting .............................................................................................................................. 10
DIN Rail Mounting .......................................................................................................................... 12
Chapter 3: Power Supply.......................................................................................................13
Power Supply.......................................................................................................................13
Safety Considerations..........................................................................................................13
Wiring the Power Supply .....................................................................................................13
Chapter 4: I/Os........................................................................................................................15
Wiring Considerations..........................................................................................................15
On-board I/Os ......................................................................................................................15
I/O Connectors ............................................................................................................................... 15
I/O Connections.............................................................................................................................. 16
Wire Size and Specifications .......................................................................................................... 16
I/O Options: According to Model..........................................................................................16
Digital Inputs................................................................................................................................... 16
High-Speed Counter/Shaft-encoder ............................................................................................... 16
Analog I/Os..................................................................................................................................... 16
Digital Outputs................................................................................................................................ 17
Installing I/O Expansion Modules ........................................................................................17
Chapter 5: Communications .................................................................................................19
RS232..................................................................................................................................19
Downloading Your Program ................................................................................................20
Connecting the Controller to the PC............................................................................................... 20
RS485..................................................................................................................................21
RS485 Network Termination Settings............................................................................................. 22
RS232/RS485 Jumper Settings...........................................................................................22
Opening the Controller.........................................................................................................23
CANbus ...............................................................................................................................25
CANbus Specifications ................................................................................................................... 25
Wiring Considerations .................................................................................................................... 25
Chapter 6: Information Mode ................................................................................................27
Using Information Mode.......................................................................................................27
Appendix A: System Data Types..........................................................................................33
Appendix B: New PLC Users ................................................................................................37

Preface
iii
Warnings and Safety Guidelines
Guidelines for user safety and equipment protection
This manual 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 electrical wiring of this device.
Symbols are used to highlight information relating to the user’s personal safety and
protection of the equipment throughout this manual.
When any of the following symbols appear, the associated information must be read carefully
and understood fully.
Danger Symbols
Symbol Meaning Description
Titl
Danger The identified danger
can cause severe
physical and property
damage.
Warning The identified danger
can cause physical and
property damage.
Caution Caution Use caution.

Vision120 OPLC™ User Guide
iv
Warnings
• 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.
• All examples and diagrams shown in the manual are intended to aid understanding.
They do not guarantee operation.
• Unitronics accepts no responsibility for actual use of this product based on these
examples.
• Due to the great variety of possible applications for this equipment, the user must assess
the suitability of this product for specific applications.
• Make sure to have safety procedures in place to stop any connected equipment in a safe
manner if the controller should malfunction or become damaged for any reason.
• Do not replace electrical parts or try to repair this product in any way.
• Only qualified service personnel should open the device’s housing or carry out repairs.
• The manufacturer is not responsible for problems resulting from improper or
irresponsible use of this device.
• Please dispose of this product in accordance with local and national standards and
regulations.

5
Chapter 1: Overview
Introducing the Vision120 OPLC™ 1
The palm-sized Vision120 OPLC™ is a member of the Vision OPLC series, programmable
logic controllers that comprise an integral graphic operating panel. The Vision120 offers an
on-board I/O configuration that varies according to model. Plug-in I/O Expansion Modules
can also be easily integrated to greatly extend the system’s control capacity. All Vision
OPLCs offer serial communications, CANbus networking options, and a real-time clock
(RTC).
Vision OPLC operating panels contain a graphic LCD screen and a keyboard. The LCD
screen displays operator instructions, alarms, and real-time variable system information via
text and graphic images. The operator uses the programmable keyboard to enter or modify
data within the Vision-controlled system. This communication interface between the
controller and operator is referred to as the HMI, or Human Machine Interface, throughout
this manual.
Figure 1. The Vision120 OPLC™ System
These features combine to offer a cost-effective solution for small-sized industrial
applications that require both an operator’s interface and the ability to control low-end
processes according to time and ambient conditions.
1Acronym for Operating panel + Programmable Logic Controller

Vision120 OPLC™ User Guide
6
Technical Description
The Vision120 OPLC (V120)
• Dimensions: 96 x 96 x 64mm (3.78” x 3.78” x 2.52”).
• Mounting: either panel or DIN rail mountable.
• Power supply: 12 or 24VDC.
• Real-time clock (RTC): enables time and date controlled functions.
• Battery back-up: protects real-time clock (RTC) and all data, including variable data.
Operating Panel
The operating panel comprises a graphic display screen and keyboard:
• The LCD screen displays both user-defined text; according to fonts selected in the HMI
program; and user-designed graphic images.
• The V120 keypad contains 16 keys.
I/Os
Different V120 models offer different on-board I/O configurations. In addition to the on-
board I/Os, the controller’s I/O expansion port enables up to 8 I/O Expansion Modules to be
connected to a single controller.
Note that I/O technical specifications are provided in separate documents.
Communications
Serial Communications
The controller has 2 serial communication ports. These may function in conjunction with
either the RS232 or RS485 standard, in accordance with the instructions provided in
“Chapter 5: Communications”, page 19.
CANbus
Specific controller models comprise 1 port for CANbus networking purposes.
Programming
Vision OPLC programs comprise both PLC and HMI applications. Both applications are
programmed on a PC using VisiLogic software.
PLC Application
The PLC application enables Vision to perform automation tasks. V120-12-xx models have
an application memory of up to 256K; V120-22-xx up to 448K. VisiLogic enables the
programmer to:

Chapter 1: Overview
7
• Build the PLC application using click-and-drop Ladder elements and functions.
• Create a modular program, comprised of separate subroutines that can be called into the
PLC application at any time.
HMI Application
The HMI application customizes the operator interface. Use it to:
• Assign functions to the keyboard keys and enable the operator to enter data via the
controller keyboard.
• Create and display text, graphic images, and variable system data on the controller’s
screen in response to run-time conditions.
An HMI application can comprise up to 255 Displays. Each Display can include text, graphic
images, and variables.
Variables allow you to display system data on the controller’s LCD screen: bit, integer, and
timer values, times and dates, I/O status and values, and text from the variable text display
list. Variables can also use a graphic image or a bar graph to represent a value or range of
values. Up to 32 fonts may be included in a typical application. A variety of languages are
supported.
When the VisiLogic program is complete, the programmer downloads it into the controller.
The data types in the tables below can be used in your applications.
Data Type Symbol Data Type Symbol
Memory Bits (coils):
2048
MB Timers:
192, 32 bit
T
Memory Integers (registers):
1600, 16 bit
MI Counters:
24
C
Memory Long Integers:
256, 32 bit
ML Inputs:
544
I
Double Word (unsigned):
64, 32 bit
DW Outputs:
544
O
Memory Floats:
24
MF
System data types, listed below, are linked to certain values or controller functions and are
reserved for use by the system. Some of them are available for use in your program. See
“Appendix A: System Data Types,” page 33.

Vision120 OPLC™ User Guide
8
Data Type Symbol Data Type Symbol
System Bits:
512
SB System Long Integers:
64, 32 bit
SL
System Integers:
512, 16 bit
SI System Double Word:
64, 32 bit
SDW
Vision controllers also contain Data Tables, which may be used to store data or contain pre-
programmed recipe parameters. Data Tables can occupy up to 120K(RAM)/64K (Flash).
Safety Guidelines
• 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.
• Check the user program before running it.
• Do not attempt to use the controller with voltage
exceeding permissible levels. Permissible voltage levels
are listed in the technical specifications provided with
your controller.
• Install an external circuit breaker and take all appropriate
safety measures against short-circuiting in external wiring.
Caution • Ascertain that terminal blocks are properly secured in
place.

9
Chapter 2: Mounting
The controller can be either panel-mounted or snap-mounted to a DIN rail.
Before You Begin
Before you begin installation procedures, check the contents of the controller kit. Standard
kits contain the controller, green plastic plug-in connectors, and 2 black plastic mounting
brackets, each with a screw inserted for panel mounting. These elements are illustrated in
Figure 2. The kit also contains a black seal, used for panel-mounting the controller; a CD-
ROM containing VisiLogic software, used to program the controller, a technical specification
sheet, and a programming communication cable. Kits comprising CANbus-ready models
also contain a green plastic CANbus plug-in connector. These items are not pictured in
Figure 2.
Figure 2. Connectors and Mounting Brackets

Vision120 OPLC™ User Guide
10
Safety and Environmental Guidelines
• 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.
• Do not place in water or let water leak onto the controller.
• Do not allow debris to fall inside the unit during installation.
• Double-check all the wiring before turning on the power supply.
• Do not touch live wires.
• Stay as far as possible from high-voltage cables and power
equipment.
• Leave a minimum of 10mm space for ventilation between the top
and bottom edges of the controller and the enclosure walls.
Panel Mounting
Before you begin, note that the panel itself cannot be more than 5 mm (0.197”) thick.
1. Make a panel cut-out that measures 92 x 92 mm (3.622” x 3.622”).
2. Check the seal that is placed over the back of the unit. The seal must fit snugly against
the back rim of the operating panel.
3. Slide the controller into the cut-out.
4. Push the two black plastic mounting brackets into their slots on the sides of the
controller as shown in Figure 2 on page 9.
5. Tighten the bracket screws against the panel as shown in Figure 3, page 11.

Chapter 2: Mounting
11
Figure 3. Panel Mounting the Controller
When properly mounted, the controller is squarely situated in the panel cut-out as shown in
Figure 4.
Figure 4. Panel Mounted

Vision120 OPLC™ User Guide
12
DIN Rail Mounting
1. Snap the controller onto the DIN rail as shown in Figure 5.
Figure 5. Snapping the Controller on to the DIN Rail
When properly mounted, the controller is squarely situated on the DIN rail as shown in
Figure 6.
96mm
3.78"
35mm
1.377"
96mm
3.78"
Figure 6. Proper DIN Rail Position

13
Chapter 3: Power Supply
Power Supply
The controller requires an external 12 or 24VDC power supply. The permissible input
voltage range is listed in the technical specifications sheet supplied with the controller. You
must use an external circuit protection device as shown in Figure 7, page 14.
Safety Considerations
• Do not touch live wires.
• A non-isolated power supply can be used provided that a
0V signal is connected to the chassis.
• Standard safety considerations require that metal cabinet
panels be earthed to avoid electrocution.
• Do not connect either the ‘Neutral or ‘Line’ signal of the
110/220VAC to the device’s 0V pin.
• In the event of voltage fluctuations or non-conformity to
voltage power supply specifications, connect the device to
a regulated power supply.
• The wiring of this device is specifically designed to be safe
and easy. A technician or engineer trained in the local and
national electrical standards should perform all tasks
associated with the electrical wiring of the device.
• Double-check all wiring before turning on the power
supply.
Wiring the Power Supply
• Do not use tin, solder or any other substance on the
stripped wire that might cause the wire strand to break.
• Install at maximum distance from high-voltage cables and
power equipment.
• To avoid damaging the wire, do not exceed a maximum
torque of 0.5 N·m (5 kgf·m).

Vision120 OPLC™ User Guide
14
We recommend that you use crimp terminals for wiring; use 26-14 AWG wire for all wiring
purposes.
1. Strip the wire to a length of 7±0.5 mm (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 according to
the figure below.
4. Tighten enough to keep the wire from pulling free.
Figure 7. Power Supply Wiring
Earthing the Power Supply
To maximize system performance, avoid electromagnetic interference by
• Mounting the controller on a metal panel.
• Earthing the controller’s power supply: connect one end of a wire, 14 AWG, to the
chassis signal; connect the other end to the panel.
Note: The wire used to earth the power supply must not exceed 10 cm in length. If your
conditions do not permit this, do not earth the power supply.

15
Chapter 4: I/Os
The controller offers an:
• On-board I/O Configuration
Each model offers a different I/O configuration.
• I/O Expansion Port
Via an adapter, you can connect a broad variety of I/O modules to the controller’s I/O
expansion port.
Wiring Considerations
• A technician or engineer trained in the local and national
electrical standards should perform all tasks associated with the
electrical wiring of the controller.
• Input or output cables should not be run through the same
multicore cable or share the same wire.
• Do not lay input/output cables near high voltage power cables.
• Allow for voltage drop and noise interference with input/output
lines used over an extended distance. Please use wire that is
properly sized for the current load.
• Double-check all the wiring before turning on the power supply.
• Unused I/O pins should not be connected. Ignoring this directive
may damage the controller.
On-board I/Os
I/O Connectors
I/O connection points are provided by external connectors at the top and bottom of the
controller. The connectors plug in, enabling quick, easy removal. They provide screw-type
connection points for the power source, inputs, and outputs. The connection points are
clearly labeled on the controller itself.
The top connector generally provides connections for the power supply, analog and / or
digital inputs and high-speed counter/shaft-encoder.
The bottom connector generally provides analog and / or digital output connection points.

Vision120 OPLC™ User Guide
16
I/O Connections
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.
Wire Size and Specifications
• Wire the inputs and outputs using 26-14 AWG wire.
• 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 the stripped wire
that might cause the wire strand to break.
• We recommend that you use crimp terminals for wiring.
I/O Options: According to Model
Technical specifications regarding specific I/O configurations are supplied with your model
controller.
Digital Inputs
Depending on your controller model, inputs may:
• function at 12 or 24 VDC in accordance with wiring and jumper settings,
• be set to pnp (source) or npn (sink) via a single jumper and appropriate wiring.
Input values are placed in operands represented by the letter “I” when you write your
program. They are numbered from 0.
High-Speed Counter/Shaft-encoder
According to your controller model, certain inputs can function as either a high-speed
counters, shaft encoders, or as normal digital inputs.
Analog I/Os
Specific controller models contain analog I/Os. These may also comprise PT100 or
thermocouple inputs.