Electronics & Computers

Acromag Announces Relay Interface Modules

May 9, 2013

The six-channel optocoupler and interposing relay modules monitor and control high-voltage field devices, using remote I/O, PLCs, or other distributed control systems with DC logic signaling.

WIXOM, MI /PRNewswire/ -- Acromag's new BusWorks XT Series multi-channel optocoupler and interposing relay modules connect discrete field devices to measurement and control system I/O modules. The XTA-120V-6 optocoupler modules have six individually isolated 120 V AC/DC digital (discrete) inputs to sense on/off levels and provide 5–32 VDC logic outputs to a fieldbus input module or a controller. The XTA-MRNO-6 interposing relay module receives 4–32 VDC logic-level signals from an output module or controller to switch six mechanical relay outputs. These two high-voltage relay interface modules offer a high-density, cost-effective solution to safely monitor or control inductive and other high-power loads (e.g., motors, valves, and solenoids) with control system input/output modules that only support low- level DC signals. Pricing starts at $150 for the mechanical relay output module and $180 for the optocoupler input module.

"These multi-channel discrete contact sensor and relay output modules offer a safe, isolated interface between high-energy field devices and sensitive control system I/O modules," explained Don Lupo, Sales and Marketing Director of Acromag's Process Products Group. "By adding optocouplers and relays, you can use PLC, DCS, or remote I/O modules with 5–24 V logic circuits to operate 120 V AC/DC contactors."

The XTA-120V-6 six-channel optocoupler is intended for use with control system digital input modules to monitor contact closures or mains power supply on/off voltage levels. Each channel senses the presence or absence of high-level voltage to determine the status of proximity switches, limit switches, toggle switches, push buttons, contacts, and other devices. Opto-isolators control a mosfet switch for a TTL-level output to safely interface the status of the monitored device.

The XTA-MRNO-6 six-channel mechanical relay is used with digital output modules to drive high-energy loads. This unit serves as an interim digital interface to switch high-voltage devices at high currents based on digital DC logic inputs. Each output has normally open Form A mechanical relay contacts (SPST-NO). LEDs on each channel indicate the output state for convenient troubleshooting.

Both modules can drive audible or visual alarms. Common uses involve operation of stack lights, bells, whistles, lights, and horns. While the XTA-MRNO-6 is intended for switching AC/DC inductive loads at high currents, the XTA-120V-6 is designed to drive low-current devices, such as solid-state relays, LEDs, relay coils, solenoids, and incandescent lamps.

An innovative housing design is only 22.5 mm wide and features removable front-facing terminal blocks for easier wiring. All units run off a 12–32 VDC power source at the terminals or through an integrated power connector bussed along the DIN rail that can provide primary or redundant power. Fail-safe operation is supported. Suitable for use in harsh environments, modules operate from –40°C to 85°C with 1500 VAC isolation and surge/transient protection. They can also withstand 25g shock and 4g vibration. CE and UL/cUL Class 1 Division 2 Zone 2 hazardous location approvals are pending.

About Acromag
Acromag has designed and manufactured measurement and control products for more than 55 years. With a headquarters near Detroit, MI, and a global network of sales representatives and distributors, Acromag products are sold worldwide. They offer a complete line of industrial I/O products, including process instruments, signal conditioning equipment, data acquisition boards, distributed I/O modules, and network communication devices. Industries served include manufacturing, water services, power generation, mining, defense, and transportation.

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