1762-L40BXBR — 1200 Series 40-Point Controller, 24V DC Input, Relay/DC Output

The 1762-L40BXBR is a 1200 Series programmable controller with 40 onboard I/O points in a single housing — 24 digital inputs (24V DC) and 16 outputs split between relay contacts and 24V DC transistor outputs. The controller, power supply, and I/O all share one unit. It runs on 24V DC and supports the 1762 expansion bus for additional I/O modules when the base point count isn't enough.

The 1200 Series controller is a mature, widely-installed controller in light machine and process automation — conveyors, packaging machines, HVAC equipment, small assembly stations, and standalone process units where the I/O count is moderate, the logic is straightforward, and a compact form factor matters more than scalability. The 40-point variant covers a realistic range of machine I/O requirements without expansion in many applications.

Specifications

Parameter	Value
Part Number	1762-L40BXBR
Series	1200 Series (1762)
Onboard Digital Inputs	24 × 24V DC (sinking/sourcing)
Onboard Relay Outputs	12 × relay (Form A, 240V AC / 30V DC, 2A)
Onboard DC Outputs	4 × 24V DC transistor (sourcing, 0.5A)
Total Onboard I/O	40 points
Expansion I/O	Up to 6 × 1762 expansion modules
Program Memory	8 KB (user program)
Data Memory	6 KB
Communication Port 0	RS-232 (DH-485 / DF1 / ASCII / Modbus RTU)
Communication Port 1	RS-232 (programming / HMI / serial device)
Built-In Display	2-line LCD with 4-button keypad
High-Speed Counter	2 × up to 20 kHz (on selected inputs)
Power Supply	24V DC (20.4–26.4V)
Operating Temperature	0°C to 60°C
Standards	UL 508, CE, cUL

40 I/O Points in One Housing

The 24-input, 16-output split is a practical ratio for most machine control tasks. Machines tend to have more sensors (limit switches, proximity sensors, pushbuttons, flow switches) than they have output devices (solenoids, motor starters, indicators, alarm outputs). Twenty-four inputs and sixteen outputs fits this asymmetry well. The mixed output type — 12 relay contacts and 4 DC transistors — is equally practical: relay contacts for the handful of outputs that switch AC loads or need isolation (contactor coils at line voltage, pilot lights on a different circuit), transistor outputs for the frequently-cycling 24V DC loads where relay wear would be a maintenance concern.

The 8 KB program memory sounds modest by modern standards but accommodates hundreds of ladder rungs. A straightforward machine control program — interlocks, sequence logic, timers, counters, some analog scaling — fits comfortably. Memory only becomes a constraint when programs need large data arrays, complex function block calculations, or extensive ASCII string handling. For the target applications, 8 KB is adequate and doesn't need to be a decision factor.

The Built-In LCD Display

The 2-line LCD with 4-button keypad is small but genuinely useful. It's not an HMI — it won't replace a PanelView. What it does well:

Live data display during commissioning: scroll through data table values while the controller is running without a laptop present. Read timer accumulators, counter values, analog input readings, and output states directly on the controller face.
Fault code lookup in the field: the display shows the controller's minor fault codes and some status information. A maintenance technician can identify a fault code without a laptop and a software license.
Limited operator interface: some applications write custom display messages to the LCD using MSG instructions, turning it into a basic status display — "RUNNING," "FAULT: E3," "BATCH COMPLETE." It's a rough capability, but useful in installations where no dedicated HMI was budgeted and the operator needs minimal feedback.
Password protection access: the keypad can lock and unlock password-protected program access without connecting a laptop.

FAQ

Q: Can the 1762-L40BXBR communicate with an EtherNet/IP network?

Not natively — the base controller has RS-232 serial ports only. An Ethernet add-on module (1761-NET-ENI or similar) connected to the serial port can bridge to EtherNet/IP, but this is a serial-to-Ethernet converter, not native EtherNet/IP. For applications needing native EtherNet/IP, a CompactLogix or other Ethernet-capable controller is the appropriate platform.

Q: What programming software is used for the 1762 series?

RSLogix 500 is the primary programming environment. Connected Components Workbench (CCW) does not support the 1200 Series — that's the Micro800 environment. RSLogix 500 programs in Ladder Diagram; there is no structured text or function block support on this platform.

Q: Can the relay outputs and the DC transistor outputs be mixed in the same circuit?

They operate independently. The relay outputs have their own output power rail (accepting any voltage up to 240V AC or 30V DC); the transistor outputs source from the 24V DC supply connected to the output terminals. There is no electrical relationship between the two output types — they can switch completely different circuits simultaneously.

Q: How many timers and counters are available?

The instruction set supports up to 512 timer and counter elements (T4: and C5: data files), expandable within the 6 KB data memory limit. Practical programs rarely approach this limit — typical machine programs use tens of timers, not hundreds.

1762-L40BXBR New Factory Sealed 1762L40BXBR 1200 40 Point Controller