Description

The Allen-Bradley 1785-V80B serves as a specialized VMEbus-compatible processor within the legacy PLC-5 ecosystem. This module enables seamless integration between standard VMEbus architectures and industrial control environments. It adheres to the C.1 VMEbus specification. This allows it to reside on the same backplane as other VMEbus CPU modules for high-speed data exchange.

Engineers utilize the 1785-V80B to bridge the gap between open-bus computer systems and rugged industrial I/O. The card executes ladder logic programs comparable to the high-performance PLC-5/40 series. However, it replaces the traditional PLC chassis mounting with a VME-standard form factor.

Key Performance Specifications

• Memory Capacity: 100,000 words (Max 32k per data table)
• I/O Support: 2,944 Total I/O points (Discrete or Analog)
• Processing Speed: 0.5ms per 1k words (Bit Logic)
• VME Compatibility: Full C.1 Specification compliance
• Communication Ports: 4 Configurable DH+/Remote I/O ports
• Serial Interface: One dedicated RS-232-C port
• Data Rates: Supports 57.6k, 115.2k, and 230.4k baud

Operational Features

The 1785-V80B manages extensive hardware configurations including 23 remote I/O racks and 92 chassis. It utilizes a dedicated VME status file for real-time bus monitoring. Users can trigger data transfers or interrupts through enhanced Ladder MSG instructions. Unlike standard PLC-5 controllers, this module relies solely on RAM and does not support EEPROM modules.

System programming occurs via several paths. You may use the DH+ network, the RS-232 serial port, or the VMEbus backplane itself. This flexibility simplifies the maintenance of hybrid control systems.

Product Specifications