1766-L32BXBA — 32-Point Compact Controller, 24V DC, Ethernet, Embedded RTC

The 1766-L32BXBA is a 32-point compact programmable controller powered by 24V DC, combining 12 high-speed and 8 standard 24V DC digital inputs, 2 analog inputs (0–10V), 6 relay outputs, 3 high-speed and 3 standard DC outputs, and 2 analog voltage outputs in one unit. It carries three communication ports — an isolated RS-232/RS-485 combo port, a non-isolated RS-232 port, and an embedded Ethernet port — plus a built-in LCD display and 20 KB of battery-backed memory.

Specifications

Parameter	Value
Part Number	1766-L32BXBA
Power Input	24V DC
Digital Inputs	12 high-speed + 8 standard, 24V DC
Analog Inputs	2 × 0–10V DC
Relay Outputs	6
DC Outputs	3 high-speed + 3 standard
Analog Outputs	2 × 0–10V DC
Communication	Isolated RS-232/485 combo, non-isolated RS-232, Ethernet
Memory	20 KB, battery-backed
Expansion Capacity	Up to 7 compatible expansion I/O modules
Display	Built-in LCD
Embedded RTC	Yes

A Wiring Caution Worth Knowing

This controller's Comm 0 port carries an important wiring restriction: connecting it to an earlier-generation compact controller using a standard 8-pin mini-DIN cable can damage the RS-232/RS-485 port on this controller, or the connected device, because the communication pins used for RS-485 signaling on this controller are repurposed for 24V power delivery on some older controller families sharing a similar connector. Always verify pinout compatibility against the specific controllers involved before making this kind of inter-controller cable connection, rather than assuming a physically matching connector means electrical compatibility.

The combination of three onboard communication interfaces gives this controller real flexibility for mixed-network installations — Ethernet for modern SCADA and HMI integration with web server capability, the isolated combo port for legacy serial protocols including DF1 and DH-485, and the non-isolated port as a secondary serial connection point. Expansion capacity for up to seven additional I/O modules extends the onboard 32 points considerably for applications that outgrow the base unit's built-in count.

FAQ

Q: Does the controller provide loop power for connected analog transmitters?

No. An external power supply matching the transmitter's specifications must be used — the controller's analog inputs read the signal but don't source loop excitation power.

Q: How many expansion I/O modules can be added to this controller?

Up to 7 compatible expansion modules can be connected, extending the discrete I/O count significantly beyond what the base 32-point controller provides on its own.

Q: What protocols does the Ethernet port support?

The embedded Ethernet port supports EtherNet/IP along with web server and email notification capability, enabling integration with HMI terminals, SCADA platforms, and other Ethernet-connected automation devices.

Q: Can the built-in LCD display be used to monitor and adjust program data directly?

Yes. The integrated LCD supports simple message display and allows monitoring or manipulation of bit and integer values directly from the controller's front panel, without requiring a connected programming device for basic interaction.

1766-L32BXBA Genuine New 1766L32BXBA 32 Point Controller