Allen-Bradley 1761-L10BWB MicroLogix 1000 Controller
The 1761-L10BWB is a compact programmable logic controller manufactured by Allen-Bradley as part of the MicroLogix 1000 product line. Powered by a 24 VDC nominal supply, this self-contained controller integrates 10 discrete I/O channels, non-volatile EEPROM memory, and an isolated communication interface into a small-footprint enclosure designed for standalone machine automation and localized process control.
Power Architecture and Operational Constraints
The unit operates on an input voltage range of 20.4 to 26.4 VDC with a power consumption of 5 Watts (10 Watts maximum rating) and an inrush current capability of 30 A for 4 ms. The internal 24 VDC power ground and chassis ground are connected internally, providing 1500 VAC isolation. Environmental tolerance spans 0 to 55 deg C (32 to 131 deg F) during horizontal DIN rail or panel mounting, reducing to 0 to 45 deg C (32 to 113 deg F) under vertical installation orientation.
I/O Signal Characteristics and Switching Capabilities
The controller incorporates 6 24 VDC discrete inputs with an operating voltage range of 14 to 30 VDC (nominal 8.0 mA at 24 VDC; maximum 12.0 mA at 30 VDC). The output section features 4 mechanical relay contact outputs supporting continuous currents of 2.5 A at 120/240 VAC, 1.0 A at 24 VDC, and 2.0 A at 125 VDC. A Master Control Relay circuit provides standard emergency shutdown protection across output branches.
Memory Allocation and Execution Performance
Execution is handled by an embedded system processor utilizing 1K EEPROM memory allocated for 737 instruction words and 437 data words, supporting up to 40 software timers. Performance metrics include a program scan time of 2.0 ms per Kword and an I/O scan time of 0.21 ms. Direct network connectivity and programming are established via a single RS-232 serial interface utilizing the DF1 protocol.
| Parameter | Specification |
|---|---|
| Model | 1761-L10BWB |
| Brand | Allen-Bradley |
| Product Line | MicroLogix 1000 |
| Product Type | Programmable Logic Controller |
| Power Supply Voltage | 20.4-26.4 VDC (24 VDC nominal) |
| Power Consumption | 5 W (10 W max) |
| Inrush Current | 30 A for 4 ms |
| Digital Inputs | 6 (24 VDC, 14-30 VDC range) |
| Relay Outputs | 4 Contacts (2.5 A at 120/240 VAC, 1.0 A at 24 VDC) |
| Memory | 1 K EEPROM (737 instruction words, 437 data words) |
| Scan Performance | 2.0 ms/Kword program scan, 0.21 ms I/O scan |
| Communication Interface | 1 x RS-232 (DF1 protocol) |
| Operating Temperature | 0 to 55 deg C (Horizontal), 0 to 45 deg C (Vertical) |
| Dimensions | 4.72 x 1.57 x 3.15 in |
| Weight | 1.50 lbs (0.68 kg) |
| Lifecycle Status | Discontinued / Obsolete |
Frequently Asked Questions
Q: What are the continuous current ratings for the relay outputs on the 1761-L10BWB? A: The relay contact outputs support continuous currents up to 2.5 A at 120/240 VAC, 1.0 A at 24 VDC, and 2.0 A at 125 VDC.
Q: How does installation orientation affect the operating temperature limits? A: Operating temperature is rated from 0 to 55 deg C (32 to 131 deg F) when mounted horizontally, but degrades to 0 to 45 deg C (32 to 113 deg F) when mounted vertically due to thermal dissipation constraints.
Q: What memory capacity is available for logic execution in this controller? A: The onboard 1 K EEPROM provides dedicated memory for 737 instruction words, 437 data words, and up to 40 timers without requiring battery power retention.
Allen-Bradley 1761-L10BWB MicroLogix 1000 Controller
Allen-Bradley 1761-L10BWB MicroLogix 1000 Controller
The 1761-L10BWB is a compact programmable logic controller manufactured by Allen-Bradley as part of the MicroLogix 1000 product line. Powered by a 24 VDC nominal supply, this self-contained controller integrates 10 discrete I/O channels, non-volatile EEPROM memory, and an isolated communication interface into a small-footprint enclosure designed for standalone machine automation and localized process control.
Power Architecture and Operational Constraints
The unit operates on an input voltage range of 20.4 to 26.4 VDC with a power consumption of 5 Watts (10 Watts maximum rating) and an inrush current capability of 30 A for 4 ms. The internal 24 VDC power ground and chassis ground are connected internally, providing 1500 VAC isolation. Environmental tolerance spans 0 to 55 deg C (32 to 131 deg F) during horizontal DIN rail or panel mounting, reducing to 0 to 45 deg C (32 to 113 deg F) under vertical installation orientation.
I/O Signal Characteristics and Switching Capabilities
The controller incorporates 6 24 VDC discrete inputs with an operating voltage range of 14 to 30 VDC (nominal 8.0 mA at 24 VDC; maximum 12.0 mA at 30 VDC). The output section features 4 mechanical relay contact outputs supporting continuous currents of 2.5 A at 120/240 VAC, 1.0 A at 24 VDC, and 2.0 A at 125 VDC. A Master Control Relay circuit provides standard emergency shutdown protection across output branches.
Memory Allocation and Execution Performance
Execution is handled by an embedded system processor utilizing 1K EEPROM memory allocated for 737 instruction words and 437 data words, supporting up to 40 software timers. Performance metrics include a program scan time of 2.0 ms per Kword and an I/O scan time of 0.21 ms. Direct network connectivity and programming are established via a single RS-232 serial interface utilizing the DF1 protocol.
| Parameter | Specification |
|---|---|
| Model | 1761-L10BWB |
| Brand | Allen-Bradley |
| Product Line | MicroLogix 1000 |
| Product Type | Programmable Logic Controller |
| Power Supply Voltage | 20.4-26.4 VDC (24 VDC nominal) |
| Power Consumption | 5 W (10 W max) |
| Inrush Current | 30 A for 4 ms |
| Digital Inputs | 6 (24 VDC, 14-30 VDC range) |
| Relay Outputs | 4 Contacts (2.5 A at 120/240 VAC, 1.0 A at 24 VDC) |
| Memory | 1 K EEPROM (737 instruction words, 437 data words) |
| Scan Performance | 2.0 ms/Kword program scan, 0.21 ms I/O scan |
| Communication Interface | 1 x RS-232 (DF1 protocol) |
| Operating Temperature | 0 to 55 deg C (Horizontal), 0 to 45 deg C (Vertical) |
| Dimensions | 4.72 x 1.57 x 3.15 in |
| Weight | 1.50 lbs (0.68 kg) |
| Lifecycle Status | Discontinued / Obsolete |
Frequently Asked Questions
Q: What are the continuous current ratings for the relay outputs on the 1761-L10BWB? A: The relay contact outputs support continuous currents up to 2.5 A at 120/240 VAC, 1.0 A at 24 VDC, and 2.0 A at 125 VDC.
Q: How does installation orientation affect the operating temperature limits? A: Operating temperature is rated from 0 to 55 deg C (32 to 131 deg F) when mounted horizontally, but degrades to 0 to 45 deg C (32 to 113 deg F) when mounted vertically due to thermal dissipation constraints.
Q: What memory capacity is available for logic execution in this controller? A: The onboard 1 K EEPROM provides dedicated memory for 737 instruction words, 437 data words, and up to 40 timers without requiring battery power retention.
