IS text and graphic displays

• Large LCD dot matrix display
• Point to point or multidrop comms with PC, PLC or DCS
• RS232 or 422 in the safe area
• Backlight
• Easy to configure - tools available
• Simulator package for offline configuration & programming
• Compatible with MTL643/644 in legacy mode

The MTL646/7 text displays are located in the hazardous area where they display alphanumeric data & graphics from a safe area host controller. This is transmitted by a serial data link passing through an MTL5051 isolating interface. This serves the dual purpose of isolating the IS indicator and converting RS232 or RS422 serial data to the MTL signal level and vice versa. Bi-directional communication permits operators to acknowledge messages and to request process action when necessary. If required, an audible or visual alarm can be connected to attract the operators attention.

A clear dot matrix display (128 x 64) can display text (in a number of sizes) and process graphics. The backlight permits operation during darkness. Operator control can be provided viea the front panel push buttons or via externa terminals to remote switches. These can be used for alarm acknowledgement, or to advance or stop the process.

The controller maintains master control, requiring all remote display units to respond to its commands. In multi-indicator applications, it transmits a block of information which includes the indicator type, address and data. Data is transmitted in the form of ASCII characters interpreted by the appropriate ndicator which either updates the display or responds with a reply such as indicator status or switch status. In single indicator applications, the protocol may be simplified to direct data transmission for communication with less sophisticated host units including PLCs, dedicated control instrumentation and weighing systems. The MTL646/7 may be configured to emulate the MTL643/4. Mechanical compatibility allows direct replacement with panel mounted MTL644 displays.

Two alarm outputs are provided for connection to suitable visual or audible alarm units to attract the operator’s attention.

The MTL647 field mounting unit is housed in a tough impact-resistant case designed to withstand the rigours of hostile weather conditions and harsh industrial environments. Ingress protection rating is IP66. It can be mounted directly onto a flat surface or, with an optional kit, onto vertical or horizontal pipes or posts.

The MTL646 panel mounting unit is designed for DIN standard 72 x 144mm cut-out. The panel/unit seal is rated at IP40 while, with standard ‘snap-on’ mounting clips, the panel/unit seal is rated IP40. This can be uprated to IP65 with the optional IPK68 sealing kit.