Unitronics M90 OPLC, M91 OPLC Installation Manual

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M90/91™ OPLC™

Installation Guide
Models M90/91™

This guide provides basic information for Unitronics’ M90/91™ OPLC™.

General Description

M90/91™ OPLC™ are palm-sized programmable logic controllers that comprise a built-in operating
panel containing a multilingual text-only LCD screen and a keypad. M90 series offer a single text line
display. M91 offers 2 text lines.

Communications

 All M90/M91 controllers comprise a serial port. M90 series support

RS232 only. An M91 serial port may be set to RS485.

 CANbus and SMS/GSM support are model-dependent features.

I/O Options

M90/91 supports digital, high-speed,
and analog I/Os via:

 Onboard I/O Configuration

Differs from model to model.

 I/O Expansion Modules

Via I/O expansion port, most
M90 models can be
expanded by up to 64 I/Os,
M91 by up to 96. Check the
specifications of your model
for details.

Programming

Write both the HMI and Ladder control application using U90 Ladder freeware.

The M90 User Guide and the product’s technical specification sheet contain additional information.
These documents are located on the Unitronics’ Setup CD. They may also be downloaded from the
Technical Library at www.unitronicsplc.com.

Standard Kit Contents

M90 or M91 controller

Rubber seal (mounted in back of panel)

Mounting brackets (x2)

I/O connectors (x2)

5-pin CANbus connector and CANbus network termination resistor (CANbus models)

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M90/91™ OPLC™

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Danger Symbols

When any of the following symbols appear, read the associated information carefully.

Symbol

Meaning

Description

Danger

The identified danger causes physical and property damage.

Warning

The identified danger could cause physical and property damage.

Caution

Caution

Use caution.

 Before using this product, the user must read and understand this document.
 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.
 Only qualified service personnel should open this device or carry out repairs.

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.
 To avoid damaging the system, do not connect/disconnect the device when 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, in accordance
with the standards given in the product’s technical specification sheet.

 Ventilation: 10mm space required between controller’s top/bottom edges & 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.
 Install at maximum distance from high-voltage cables and power equipment.

Mounting

Dimensions

Installation Guide

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Panel mounting

Before you begin, note that the
mounting panel cannot be more
than 5 mm thick.

1. Make a panel cut-out
measuring 92 x 92 mm
(3.622” x 3.622”).

2. Slide the controller into the
cut-out, ensuring that the
rubber seal is in place.

3. Push the 2 mounting brackets
into their slots on the sides of
the controller as shown in the
figure to the right.

4. Tighten the bracket screws
against the panel. Hold the
bracket securely against the
unit while tightening the
screw.

5. When properly mounted, the
controller is squarely situated
in the panel cut-out as shown
in the figure to the right.