Dixell XWEB 3000 Installation Manual download pdf (Page 61)

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The possible errors that may occur when sending the set to the central device include:

"Timeout" => No response from device.

"Exception" => Value not accepted by device.

"Unknown" => Unknown error.

"Success" => Value sent with success.

The device name/address is shown in the "device" column.

3.4.6 XWEB5000 SUPERVISOR SYSTEM (ONLY XWEB5000)

The supervision concept significantly expands the possibility of intervention by the XWEB5000 on

system management. Supervision is intended as the ability of independent intervention by the monitoring

unit on the monitored devices. To simplify the concept, it may help to think of a functional block with all the

variables detected on the controller field (temperatures, pressures, operating status, alarms, etc...) as an

input, and as an output, the possibility of sending specific commands to the same controllers. The basic link

between input and output lies in the supervision, that is to say, in a special algorithm that the user has

programmed and that the system implements each time the input variables meet the set criteria. Pay due

attention to the fact that the sending of certain commands verified, following the establishing of certain input

conditions, is not accompanied by the sending of additional commands when the input conditions fail. In

other words, when the user considers and realises the direct action, the reverse action must then be

realised. Otherwise, the system is unable to restore the initial conditions when required.

Given the evident importance of this new work tool, Dixell has tried to make its usage as simple as possible

for the end-user. This is why the event is programmed through the graphic user interface, therefore, no

programming knowledge is required (in contrast with what occurs with normal programming languages for

PLC).

THE PROJECT

From a practical point of view, the user must be familiar with the supervision project to be realised in

advance, this is why, for educational purposes, the project considered throughout this chapter will be the

following:

the installation in question, demonstrates the need to monitor the operating state of an emergency generator

that is only activated should there be no electric energy supply. Upon the occurrence of this condition, the

supervisor must send a series of commands to the utilities in order to manage, at the highest possible level,

the energy saving function during a power-cut. In the example in question, the generator is monitored

through means of a Dixell XJA50D controller (alarm/status acquisition module): when the generator is

activated, the module signals this through the variation of the corresponding digital input. During operation

with an emergency generator, the XWEB-EVO must send the "energy saving" command (variation of work

set-point) and, only for the compatible utilities as well as the "save cold" curtain lowering command.

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Dixell XWEB 3000 Installation Manual Page 61