Expert System Solutions: Turnkey Telecommunication Products & Services / Wireless Telemetry

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WWAT Specifications

WWAT Example With SCADA Interfacing

WWAT Example Without SCADA Interfacing

 

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WWAT-488

The WWAT-488 module has 4 analogue inputs (4 - 20 mA instrumentation standard), 8 digital inputs and 8 digital outputs. It can be easily mounted on the industrial standard DIN rail and placed in a DB board. All inputs and outputs are opto-coupler protected against surges.

The WWAT-488 module was designed to be configurable with a variety of communications media. Some of these media are very limited in bandwidth and some are provided by third-party infrastructure providers that must be paid for. To restrict the amount of data sent on the communications link, a programmable delta is provided on the analogue inputs. The digital input data is sent on change only, thus providing the scaling of the amount of data sent. This helps to remove bottle necks in the telemetry system and provides a more effective frequency and call utilisation and therefor also expandability on the number of wwat units.

 

WWAT-488 Module

 

WWAT-488 Module With Switch Board

Mounted WWAT-488 Module

 

In certain installations the power available for radio communications are limited, typically battery powered installations. A power-save mode is available whereby the radio is switched off while not in use.

While WWAT was designed primarily to interface to SCADA systems, ESS did identify the need for a design whereby two WWAT modules can be used back to back in small configurations. One WWAT module is used in the normal manner to interface with the required digital inputs, while the second WWAT module is used to act as a mimic panel. In this configuration the mimic panel mimics the state of the remote inputs on its local outputs. The outputs are then typically used to drive indicator lamps. An audio alarm feature is also included in the WWAT module to facilitate the building of visual alarm panels.

"Alive" messages are sent frequently to ensure the reliability of the WWAT data transmissions.

The WWAT unit is easy to install and does not require any field programming. ESS has ensured that minimal maintenance is needed on the entire system to allow client and dealer technicians to carry out their own maintenance.

WWAT Specifications

 

Analogue inputs are sampled at 20 Hz raw and are filtered over 10 samples, thus the effective sampling rate is 2 Hz

Analogue data values are sent when a pre-defined delta is exceeded

Delta's values are programmable as 1%, 5%, 10% and 20%

Analogue input can be individually enabled or disabled

Digital inputs are debounced, programmable at 50 ms, 200 ms and 1 second

Inputs can be programmed to be counters

Input rising, falling or both edges can be programmed

Sending of counter values is programmable between 1 and 1000 counts

Digital input can be individually enabled or disabled

Digital outputs can be programmed for level or pulse output

Digital pulse output can be programmed between 1 and 999 seconds

On "Power On" condition, all the input values will be transmitted

Keep-alive messages sending can be programmed between 1 and 999 minutes

Power save mode is supported (Switch off transceiver)

Up to 100 inputs events are buffered when communications is down

 

 

WWAT Example With SCADA Interfacing

WWAT Example With SCADA Interfacing

WWAT Example Without SCADA Interfacing

WWAT Example Without SCADA Interfacing

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