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  Function Keys
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)

Ordering
OM420 - Module with Dark Gray enclosure. Please note that each PLC has a different suffix according to the following table.