Isolated I/O module serves as counter/timer

Space-saving 1in-wide modules provide an isolated Ethernet Modbus TCI/IP interface for any input/output mix of up to 16 discrete signals.

Acromag has extended its BusWorks line of high-density Ethernet I/O modules for distributed I/O and Scada with new Model 989EN isolated discrete I/O that also performs counter/timer functions.

These space-saving 1in-wide modules provide an isolated Ethernet Modbus TCI/IP interface for any input/output mix of up to 16 discrete signals.

Inputs sense the status of dry contacts, switches, power supplies, or DC logic.

Industrial-grade units have eight 32bit pulse counters with timers, alarms, and nonvolatile memory for metering, totalising and low-frequency periodic measurement functions.

Outputs control solid-state switching of lamps, horns, and other devices.

Prices start at US $195.

Common applications involve monitoring of temperature, pressure, flow, level and discrete sensor switches in process control applications.

Outputs are ideal for switching valves, actuators, pumps, and motors as well as for audible or visual alarms.

Counter/timer functions are useful for proximity, RFID, or speed measurement and for totalling pulses in utility meter and predictive maintenance cycle applications.

Commercial and industrial-grade models have 16 individually configurable bidirectional I/O channels with a 0-28V DC signal range.

When configured as inputs, channels accept two- or three-wire sensors and active logic switches for use with dry contacts, proximity, Namur, or 5-28V DC logic.

Inputs detect a level or change of state.

Outputs switch 0.5A per channel or 2A total.

A "loopback" feature reads back the output state on an input channel.

Industrial models add eight counter/timers that can be configured as 32bit up/down pulse or event counters with nonvolatile memory or as 16bit periodic timers.

Each counter supports momentary or latching alarms.

The counters have a 250Hz maximum frequency and the timers have resolution to one millisecond.

A programmable debounce setting filters out relay chatter.

These units are very easy to use.

No software is required as the units are configured using any web browser to setup embedded configuration menus.

An auto-copy function lets users rapidly apply a saved configuration to multiple units.

Automatic MDI/MDI-X negotiation simplifies installation.

BusWorks 989EN units are also designed for high-reliability operation.

Units feature 1500V RMS isolation with surge protection to increase performance and prevent damage from high-voltage transient signals.

The isolation separates power, I/O, and network circuits.

To further ensure dependable operation, the I/O circuitry includes overtemperature, overvoltage and overcurrent protection.

Industrial-grade models operate reliably across a wide 40 to +65C temperature range.

Power-up conditions are programmable and watchdog timer output is configurable for failsafe or hold-last-value operation in the event of a network failure.

Units perform self-test diagnostics and provide front-panel LEDs for visible verification of operation.

CE, UL and ATEX approvals (Zone 2, Class I, Division 2, Group ABCD locations) are pending.

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