Allen-Bradley 1785-L60B PLC5 Processor 64K Memory

Allen-Bradley 1785-L60B PLC-5 Processor with 64K Memory

Product Introduction

The 1785-L60B processor represents a powerful member of the Allen-Bradley PLC-5 family, specifically engineered for medium to large-scale automation applications. This controller delivers an impressive 64K words of user memory and supports up to 3072 I/O points, making it suitable for complex machinery and process control. Its most distinguishing feature is the integration of four (4) DH+/Remote I/O combo ports, which provide exceptional connectivity and networking flexibility.

Furthermore, the 1785-L60B offers comprehensive communication capabilities through its configurable serial port and dedicated programming terminals. The controller works seamlessly with a wide range of I/O modules, including 8-point, 16-point, 32-point, and intelligent specialty modules. Consequently, this Allen-Bradley processor provides engineers with a robust and scalable solution for demanding industrial environments.

Technical Specifications

Memory and I/O Capacity

The 1785-L60B provides a maximum user memory of 64K Words of battery-backed static RAM. For discrete I/O, it handles a total of 3072 points in any mix, or 3072 inputs and 3072 outputs in complementary mode. For analog applications, the controller supports up to 3072 analog I/O points. Users can expand memory using optional backup modules such as the 1785-ME16 (16K Words), 1785-ME32 (32K Words), 1785-ME64 (64K Words), or the 1785-ME100.

Communication Ports

This controller boasts an extensive array of embedded communication interfaces. It features four (4) combo ports that can serve as Data Highway Plus (DH+) or Remote I/O (RIO) in either adapter or scanner mode. These ports use 3-pin terminals and accept 1770-CD or Belden 9463 communication cables. Additionally, the 1785-L60B includes one (1) serial port configurable for RS-232, RS-422A, and RS-423 standards via a 25-pin sub-D connector. This serial port supports ASCII and DF1 half and full-duplex protocols. The controller also provides two (2) programming terminals with 8-pin mini-DIN circular connectors, which can also assign to DH+ protocol.

Status Indicators

The 1785-L60B features comprehensive status LED indicators on its front face. These include a BATT LED for battery status, RUN/FAULT indicators for mode status, a FORCE LED indicating active I/O forcing, and a COMM LED showing Channel 0 communication status.

Processing Speed and Scan Time

This Allen-Bradley processor delivers efficient program execution with flexible I/O scan times. Remote I/O scan times vary based on baud rate: 10 ms at 57.6 kbits/s, 7 ms at 115.2 kbits/s, and 3 ms at 230.4 kbits/s. The controller also includes a Control Coprocessor Expansion Port for future enhancements.

Hardware and Addressing

The 1785-L60B offers three flexible hardware addressing modes. The 2-slot mode addresses any mix of 8-point modules and pairs of 16-point modules, but does not support 32-point modules. The 1-slot mode addresses any mix of 8 or 16-point modules and pairs of 32-point modules. The half-slot mode addresses any mix of 8-point, 16-point, and 32-point modules. This flexibility allows engineers to optimize chassis utilization for specific application requirements.

Chassis and I/O Support

The 1785-L60B supports up to 93 I/O chassis in total, with one local chassis and up to 92 universal remote chassis. It accommodates a maximum of 24 I/O racks and supports 8-point, 16-point, 32-point, and 1771 intelligent I/O modules.

Power and Electrical Specifications

This processor draws power from the backplane and operates with compatible power supplies. The module includes an internal 1770-XYC battery, which will completely discharge 30 days after the BATT LED first activates. Users should monitor this indicator and replace the battery promptly to prevent data loss.

Mechanical and Environmental Parameters

The 1785-L60B withstands demanding industrial environments with ease. It operates reliably within a temperature range of 0 to 60°C (32 to 140°F) and tolerates relative humidity from 5% to 95% (non-condensing). The controller handles operational shock of 30G and operational vibration of 2G at 10 to 500 Hz. It carries UL, C-TICK, CE, and CSA certifications, ensuring compliance with international standards. The module comes in an open-style enclosure and weighs approximately 1.42 kilograms (3 pounds).

Installation and Mounting Guide

A qualified automation technician should perform the installation of the 1785-L60B. First, ensure the selected 1771 chassis is properly mounted, grounded, and powered off. Then, insert the processor into the left-most slot of the chassis, applying firm and even pressure to seat it correctly into the backplane connectors.

Next, configure the addressing switches (S1, S2, S3) to define the appropriate node address for DH+ and RIO networks. Afterward, connect the required communication cables to the appropriate ports. For DH+ and RIO, use the 1770-CD or Belden 9463 cables. Finally, apply power to the chassis and observe the status LEDs to confirm a successful initialization. Always handle the module with proper ESD precautions.

Packaging and Shipping Information

Each 1785-L60B processor comes in secure packaging to ensure safe transit. The package contains the processor module itself (with pre-installed 1770-XYC battery), along with a static-sensitive device warning label and a basic installation guide.

Shipping Methods:
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Frequently Asked Questions (FAQ)

Q1: What is the maximum user memory of the 1785-L60B controller?
A: The 1785-L60B provides a maximum user memory of 64 Kilowords (64K Words) of battery-backed static RAM.

Q2: How many DH+/Remote I/O ports does the 1785-L60B have?
A: This Allen-Bradley PLC-5 processor features four (4) combo ports that can function as either DH+ or Remote I/O in adapter or scanner mode.

Q3: What battery does the 1785-L60B use, and when should users replace it?
A: It uses the 1770-XYC battery. Users should replace it promptly when the BATT LED activates, as the battery will completely discharge within 30 days.

Q4: How many I/O chassis can the 1785-L60B support?
A: This controller supports up to 93 I/O chassis in total, with one local chassis and up to 92 universal remote chassis.

Q5: What memory backup modules are compatible with the 1785-L60B?
A: Compatible modules include the 1785-ME16 (16K Words), 1785-ME32 (32K Words), 1785-ME64 (64K Words), and the 1785-ME100.