Allen-Bradley 1747-L20C Fixed Style Hardware Controller

The Allen-Bradley 1747-L20C is a fixed style hardware controller. This module is part of the SLC 500 product family. It comes with embedded input and output channels, specifically Twelve (12) 24VDC sink inputs and Eight (8) AC/DC Relay outputs. Additionally, it has high-speed counter capability, allowing the controller to be used in industrial counting applications, typically required in the manufacturing industry.

The 1747-L20C requires a nominal 120 / 240VAC supply voltage to operate while the applicable input voltage range is 85-264 VAC with input frequency range of 47-63 Hz. This power supply has a built-in load-dependent hold-up time of 20 milliseconds to 700 milliseconds. It comes with an integrated fuse for line protection. The 1747-L20C is designed to withstand an inrush current rating of 30 Amperes, maximum.

The 1747-L20C has 1K Instruction Capacity program memory that is capacitor backed-up. The embedded processor has a typical scan time of 8 milliseconds/1K with bit execution speed of 4 microseconds. The modules memory backup options includes use of a EEPROM or UVPROM module. It has built-in LED indicators composed of POWER, PC RUN, CPU FAULT, FORCED I/O, and BATTERY LOW.

Manufacturer

Allen Bradley

Category

PLCs

Product Line

SLC 500

Part Number

1747-L20C

Weight

3.00 lbs (1.36 kg)

High-Speed Counter

Supported

Product Description

SLC 500 Fixed style hardware controller

Discrete inputs

Twelve (12) 24VDC sink inputs

Discrete outputs

Eight (8) AC/DC Relay outputs

Indicators

POWER, PC RUN, CPU FAULT, FORCED I/O, and BATTERY LOW

Program memory

1K

Memory Type

Capacitor-backed RAM memory

Typical scan time

8 milliseconds/1K

Bit execution

4 microseconds

Power Supply Operating Voltage

85-265 VAC, 47-63 Hz

Power Supply Fuse Protection

1.25A

Module Type

Fixed Controller

Inputs

(12) 24 V DC Sink

Outputs

8 AC/DC Relay

Line Power

120-240 Volts AC

01

Q: How does the AB 1747-L20C streamline compact control system deployment while maintaining robust processing performance?
A: The AB 1747-L20C integrates processor, power supply, and I/O capabilities into a compact controller platform, enabling efficient automation control for small- to medium-sized industrial applications.

02

Q: What distinguishes the AB 1747-L20C as a versatile solution for decentralized machine control architectures?
A: The AB 1747-L20C combines embedded digital I/O resources with SLC 500 processing functionality, allowing users to implement space-efficient control strategies without requiring extensive additional hardware.

03

Q: Why is the AB 1747-L20C particularly advantageous for OEM machinery and standalone automation systems?
A: The AB 1747-L20C offers an integrated controller design that reduces panel space requirements, simplifies installation, and minimizes wiring complexity, making it well-suited for compact machine automation projects.

04

Q: Which operational parameters should engineers evaluate when specifying the AB 1747-L20C for mission-critical industrial environments?
A: When deploying the AB 1747-L20C, engineers should assess memory requirements, I/O capacity, communication needs, environmental conditions, power availability, and future expansion expectations to ensure optimal system performance.

05

Q: How can the AB 1747-L20C enhance maintenance efficiency and lifecycle reliability within industrial control systems?
A: The AB 1747-L20C provides dependable control functionality and straightforward diagnostic access, enabling maintenance teams to identify issues more rapidly, reduce downtime, and improve overall equipment effectiveness.

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