SM128V VMEbus Interface Card

Product Overview

The SM128V is a VMEbus interface card designed for high-speed data exchange between VME-based control systems and iba data acquisition platforms. It provides a reliable and deterministic communication link with synchronous transmission of analog and digital signals. The card is built for industrial environments requiring real-time process monitoring, control, and data logging.

Key Technical Features

• One bidirectional fiber optic channel supporting 64 analog and 64 digital signals

• One unidirectional fiber optic channel supporting 64 analog and 64 digital outputs

• Synchronous data transmission with 1 ms cycle time

• Supports cascade operation with up to eight cards on Channel 1

• Compatible with A24 and A32 VME address modes

• Supports D08, D16, and D32 VME data formats

• Configurable byte order and analog data format via DIP switches

• Front panel status LEDs for power, link, and error indication

Hardware Specifications

• Power Supply: 5 V from VMEbus, typical consumption 1 A

• Address Space: 256 kByte on VMEbus

• Fiber Optic Interface: ST connectors, 3.3 Mbps transmission rate

• Maximum Fiber Distance: 2000 m

• Form Factor: 6U / 4HP, single VME slot

• Operating Temperature: 0°C to 50°C

• Storage Temperature: -25°C to 70°C

Configuration Options

The SM128V offers extensive configuration flexibility through front panel switches and onboard DIP switches. The Mode switch selects between normal operation and peer-to-peer mode. The Range and Address switches define the signal position and quantity in cascade mode. Onboard DIP switches allow configuration of VME base address, byte order, and data format. The card also provides a hardware reset button and clear LED status indicators for operational monitoring.

System Compatibility

The SM128V is compatible with a wide range of VME-based control systems including GE 90/70, Siemens Simatic TDC, and ALSPA platforms such as CP80/A800, C80 HPC, and C80 HPCI. It integrates seamlessly with ibaPDA for data acquisition and ibaLogic for soft PLC applications. The card also supports direct connection to ibaFOB series interface cards and ibaPADU-8 I/O devices.

Operational Modes

In cascade mode, multiple SM128V cards can be connected in a daisy-chain configuration, allowing up to 64 signals to be transmitted over a single fiber optic link. Each card occupies a defined position within the telegram based on its address and range settings. Peer-to-peer mode enables direct data exchange between two SM128V cards without requiring additional hardware or software.

Industrial Applications

The SM128V is widely used in industrial automation for applications such as high-speed data acquisition from VME-based controllers, process monitoring and analysis, distributed I/O expansion, and integration of legacy VME systems with modern data analytics platforms. Its deterministic 1 ms cycle time ensures precise synchronization between control and monitoring systems.

Summary

The SM128V VMEbus interface card delivers high-speed fiber optic communication, flexible configuration, and broad system compatibility. It is a reliable solution for integrating VME-based automation systems with iba data acquisition and control platforms in demanding industrial environments.