Unitronics M90 OPLC User Manual

Unitronics
1
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)

Unitronics M90 OPLC Specifications

General

Model	M90
Input Voltage	24 VDC
Programming Software	UniLogic
Programming Language	Ladder Logic
Type	OPLC
Digital Inputs	8
Analog Outputs	2
Communication Ports	RS232, RS485, USB
Display	LCD
Relay Outputs	Available in some models
Transistor Outputs	Available in some models
CPU	32-bit
Operating Temperature	0°C to 50°C

Summary

General Description

Communications

Details on serial ports and model-dependent communication features like CANbus and SMS/GSM.

I/O Options

Information on onboard and expandable digital, high-speed, and analog I/Os.

Programming

Guidance on writing HMI and Ladder control applications using U90 Ladder freeware.

Standard Kit Contents

Safety and Environmental Precautions

Danger Symbols

Explanation of symbols indicating potential danger, warning, or caution for safe product use.

Environmental Considerations

Guidelines for installing the controller in suitable environments, avoiding dust, moisture, and vibration.

Mounting Dimensions

Panel Mounting

DIN-rail Mounting

I/O Modules and Wiring

I/O Modules

Overview of onboard and expandable I/O configurations and their technical specifications.

Wiring: General

Important guidelines for safe and effective wiring, including terminal torque and wire stripping.

Power Supply Requirements

M91 only: Earthing the Power Supply

Specific instructions for earthing the power supply on M91 models to maximize performance and minimize interference.

Communication Ports Overview

Serial Communications

Description of RS232 and RS485 serial communication capabilities for programming and networking.

Pinouts and Jumper Settings

Pinouts

Detailed signal assignments for RS232 and RS485 ports and controller connections.

M91 only: RS232 to RS485: Changing Jumper Settings

Procedure for accessing and modifying jumpers to switch between RS232 and RS485 modes on M91.

RS232/RS485 Jumper Settings

CANbus Communications

CANbus Wiring

Guidelines for using twisted-pair cable and terminators for setting up a CANbus network.

CANbus Connector

Description of the CANbus connector pinout, including power and signal lines.