The OM420 Operator Panel is a low cost/high performance man/machine interface with a broad range of operator input and display capabilities. The panel includes a 2 line by 20 character LCD display, four function keys, and the ability to display BCD, BCD Double, Binary, and floating-point numbers. OptiMate® configuration software allows you to predefine up to 160 messages. These messages can be later selected by your PLC or computer program to display status, and variable data.

Function keys can be custom labeled by the user with plastic inserts. The inserts can be custom legended with text and/or graphics, and slipped into a protective pocket behind the faceplate.

The OM420 Operator Panel is part of Optimation's OptiMate® series. Each OptiMate® module is designed to connect to most PLC's with a single cable connection. OptiMate® 400 series panels can be used individually, with a PLC, or in a microprocessor system.

When used with a microprocessor system, simple communications over an RS232 communications cable allows the microprocessor to directly control the LCD display as well as to read function key status.

When used with a PLC, operation is transparent to the user. Terminal functions tie directly into your PLC ladder logic program. The OM420 takes care of the rest.

Features

• 2 line x 20 character backlit LCD display
  
• Floating point, BCD, BCD Double and Binary data display
  
• User-Legendable function keys
  
• 160 User-definable messages
  
• Stand-alone capability with direct connection to most PLCs
  
• RS232 communications
  
• Mix and match with most other OptiMate® modules

Benefits

• Eliminates the need for controller I/O modules for operator panel use
  
• Easy function selection, display and status indication in one module
  
• Reduces system integration and retrofit costs
  
• Remove and replace maintainability
  
• Rapid future expansion
  
• Reduced maintenance costs
  
• Attractive, eye-appealing appearance

Operational Overview
The OM420 Panel incorporates all of the basic elements necessary for operator interface. Function keys allow operator function selection, and the alphanumeric display provides text information and numerical display capability. The OM420 interfaces over an RS232 serial link to any computer-based system and many popular PLCs. In a computer-based system, interface occurs via a very easy to use OptiMate® Hex protocol. For a PLC-based system, operation is totally controlled through a bank of 7 PLC registers. Everything else is handled by the OM420 terminal.

PLC Based Systems
PLC-based systems access the OM420 via a bank of 7 registers. Buttons appear as coils and contacts (or register bits) in the PLC. Messages can be predefined, stored in the OM420 and used by the PLC program. To use a predefined message, your PLC program simply places the message number that you have associated with the message into a PLC register. Text, data display, and arrow adjustment messages are all available. Up to 160 messages can be predefined.

Use with a Computer
The OM420 Panel provides all of the same capabilities to a computer-based system that it does to a PLC system. The OptiMate® Hex protocol makes computer-based applications a very simple undertaking. Message numbers and display data are sent to the OM420 over a serial link. Button status can be read back from the OM420 by the same serial link. Also, in addition to the 160 predefined messages, additional messages with embedded data can be sent to the OM420 via the serial link.

Specifications

Physical

• Recessed Mount Housing 6.6"L x 3.5"H x 1.25"D
  
• Cutout size for above 3.20"Hx5.10"L
  
• Panel Fasteners : Four, 6x32 threaded studs (on ends, symmetrical about center line)
  
• Weight : 8 ounces
  
• Color: Dark gray housing . Function keys : White with user supplied label
  
• LCD display : 2 line x 20 character STN with LED backlight
  
• Character size : 5.5mm high x 3.2mm wide
  
• Button Type : Membrane panel with dome switch snap action
  

Electrical

• Power (all lamps on) : 5VDC @ 0.58 Watts, 115 mA @ 5VDC
  
• Power connector :DC Power plug, center negative

Communications

• RS232 ; 4800 to 19200 baud
  
• Compatible with most major PLC protocols
  
• Microprocessor-compatible OptiMate® Hex protocol
  
• 6 pin RJ12 phone jack-type connector
  

Environmental

• Enclosure - NEMA 4 (installed)
  
• Temperature - 0 to 50 C
  
• Humidity - 95% Non-condensing
  

Labeling of Lamps and Pushbuttons

• User-defined slide-in labels

Message Types (160 user-defined messages available)

• General Text message
  
• Data display message (one data value per line)
  
• Numeric Types & Values
  
• Integer
  
• Fixed Point
  
• BCD (Values between 0 & 9999; with appropriate decimal placement)
  
• BCD Double (values between 0 & 99999999 with appropriate decimal placement)
  
• Binary (Values between 0 & 65535 with appropriate decimal placement)
  
• Floating Point (Values between -3.402823E+38 to +3.402823E+38 in the format of ±X.XXE±XX)

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