HMI Terminal | Allen-Bradley 2711-T5A1L1 Operator Interfaces

The Allen-Bradley 2711-T5A1L1 is a PanelView 550 operator interface terminal designed for local machine control and process status monitoring. It combines a 5.5-inch monochrome LCD display with resistive touchscreen input, enabling real-time operator intervention and parameter adjustments directly from the plant floor.

Display and Touchscreen Interface

The terminal features a 5.5-inch monochrome LCD blue-mode screen with a resolution of 256 x 128 pixels. Operator navigation and data entry are executed via an analog resistive touch screen. Visual illumination is supplied by a field-replaceable 2711-NL1 backlight module.

Network Connections and Memory

Communication with host controllers is established through a dedicated Remote I/O (RIO) port, allowing connection to a scanner or sub-scanner module on an RIO network. An auxiliary RS-232 port is provided for connection to a serial printer to log alarms and process messages. System memory includes 170 KB of application runtime storage, which can be expanded using a compatible PC flash memory card.

Power Requirements and Enclosure Mounting

The unit operates exclusively on a 24 VDC power supply with an input range of 18-32 VDC and a maximum power consumption of 18 W (0.75 A). Internal circuitry and a fuse provide protection against reverse polarity and over-voltage conditions. The terminal carries NEMA Type 12, 13, and 4X (indoor) environmental ratings when properly installed in an industrial panel cutout.

Frequently Asked Questions

Q: What power source is required to operate the 2711-T5A1L1 operator terminal? A: This unit requires a 24 VDC power supply (18-32 VDC operating range). Connecting this model directly to an AC power source will cause damage to the internal circuitry.

Q: Which communication protocols are available on this model? A: The 2711-T5A1L1 utilizes a Remote I/O (RIO) port for controller communication across an RIO network and an RS-232 port dedicated to serial printer connections.