Analogue module interfaces signal conditioned data
An
Acromag product story
Edited by the Engineeringtalk editorial team
Sep 11, 2009
Acromag's 16-channel Busworks module provides an Ethernet interface for a rack of 8B signal conditioners to simplify data acquisition from a broad mix of analogue isolation amplifiers.
The 958EN model has 16 analogue input channels and a quick-connect DB25 port to capture isolated and amplified sensor signals directly from a full panel of industry-standard 8B signal conditioners.
This analogue input module performs fast, 16-bit A/D conversions to make the temperature, frequency, strain gauge or other sensor data available to any control device via Ethernet.
Typical applications involve processes requiring high voltage isolation or a mix of signal types (power generation, glass/metal processing, test/measurement instrumentation and Scada systems).
Industrial-grade models offer -40 to 70C temperature operation and integration/totalisation capability, and are designed for UL/cUL Class 1 Division 2 ABCD (Zone 2) sites.
The 958EN has 16 analogue voltage inputs to accept +/-5V and +/-10V signals from 8B or legacy 7B signal conditioning modules through a DB25 port.
The 8B modules support more than 100 analogue input types.
Fast scanning updates all 16 channels in just 8ms.
Dual-format data registers support 16-bit integer and 32-bit floating point formats.
Users can read raw channel data based on 16-bit signed integer or 32-bit scaling registers, configurable on a per-channel basis to minimise CPU or HMI software processing time.
Surge protection and three-way 1,500V isolation between I/O, power and network circuits increase reliability.
A sample averaging function is user configurable and is said to improve performance in noisy or fluctuating environments.
On industrial-grade units, an integration function can totalise inputs with non-volatile counter registers on all channels.
Totalising is great for flow applications, providing the ability to accurately measure actual volumetric usage on liquid, gas, electricity and fuel flows.
Users can read instantaneous flow signals and totalised volume data on each channel.
Configuration and totalisation information are stored in non-volatile memory, which is safe in the event of a power loss.
No software is required as the units can be configured using any internet browser to set operating parameters on embedded web configuration pages.
An auto-copy function lets users apply a saved configuration to multiple units.
The automatic calibration function uses built-in precision sources.
On-demand self-test capability verifies the calibration and performance.
Front-panel LEDs provide a visible confirmation of proper operation.
Acromag's Modbus C Library software can simplify the development of custom programs to interface with Acromag's Busworks and Etherstax Ethernet I/O products.
The library, Model ESW-MBLIB, also supports any standard Ethernet Modbus slave device communicating via Modbus TCP/IP or UDP/IP protocol.
This utility is suitable for developers that are unfamiliar with Modbus protocol or the framing of TCP/IP or UDP/IP messages.
The C library simplifies programming and makes it portable by linking user code with the provided function calls.
Most function calls require passing only a few parameters such as the IP address, Modbus register address and register count.
The library can be used to develop programs in a Microsoft Visual C environment and with Linux, VXworks, QNX or OS9 operating systems.
An example program and C source code are provided.
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