limit-monitor.html

<script type="text/javascript">

	RED.nodes.registerType( 'limit-monitor', {
		defaults: {
			name: { value: '' },
			topic: { value: '' },
			limit: { value: '0', validate: RED.validators.regex( /^-?[0-9]+(\.[0-9]+)?$/ ) },
			kind: { value: '1', validate: RED.validators.regex( /^[1,2]$/ ) },
			delay: { value: '0', validate: RED.validators.regex( /^[0-9]+$/ ) },
			hysteresis: { value: '0', validate: RED.validators.regex( /^[0-9]+(\.[0-9]+)?$/ ) }
		},
		category: 'function',
		inputs: 1,
		outputs: 1,
		color: '#f78d86',
		icon: 'font-awesome/fa-binoculars',
		paletteLabel: 'limit monitor',
		label: function() {
			return this.name || 'limit monitor';
		}
	} );

</script>

<script type="text/html" data-template-name="limit-monitor">
	<div class="form-row">
		<label for="node-input-name"><i class="fa fa-fw fa-tag"></i> Name</label>
		<input type="text" id="node-input-name" placeholder="Name" />
	</div>
	<div class="form-row">
		<label for="node-input-topic"><i class="fa fa-fw fa-tasks"></i> Topic</label>
		<input type="text" id="node-input-topic" placeholder="Topic" />
	</div>
	<br />
	<div class="form-row">
		<label for="node-input-limit"><i class="fa fa-fw fa-binoculars"></i> Limit</label>
		<input type="text" id="node-input-limit" style="text-align: center; width: 100px;" />
	</div>
	<br />
	<div class="form-row">
		<label for="node-input-kind"><i class="fa fa-fw fa-arrows-v"></i> Type</label>
		<select id="node-input-kind" style="width: 120px;">
			<option value="1">Lower limit</option>
			<option value="2">Upper limit</option>
		</select>
	</div>
	<div class="form-row">
		<label for="node-input-delay"><i class="fa fa-fw fa-clock-o"></i> Delay</label>
		<input type="text" id="node-input-delay" style="text-align: center; width: 100px;" />
		<span>seconds</span>
	</div>
	<div class="form-row">
		<label for="node-input-hysteresis"><i class="fa fa-fw fa-level-down"></i> Hysteresis</label>
		<input type="text" id="node-input-hysteresis" style="text-align: center; width: 100px;" />
	</div>
</script>

<script type="text/html" data-help-name="limit-monitor">
	<p style="text-align: justify;">
		A limit monitor for Node-RED. An upper limit or a lower limit can be monitored. The alarm
		triggering can be delayed and the leaving of the alarm state can be controlled by a hysteresis.
	</p>
	<p style="text-align: justify;">
		The value to be monitored is received in numeric form via <code>msg.payload</code>. A violation of
		the entered <b>Limit</b> generates an output message with <code>true</code> in <code>msg.payload</code>.
		If the violation is removed, a message with <code>false</code> in <code>msg.payload</code> is sent.
	</p>
	<p style="text-align: justify;">
		Set the kind of the limit, upper or lower, using the <b>Type</b> parameter.
	</p>
	<p style="text-align: justify;">
		The triggering can be delayed by an adjustable number of seconds using the <b>Delay</b> parameter.
		When monitoring an upper limit, the limit value must be reached or exceeded for the set delay time to indicate
		the limit violation. A lower limit must be reached or undershot for the delay time to generate an output message.
	</p>
	<p style="text-align: justify;">
		The <b>Hysteresis</b> parameter indicates by how much the input value must fall below (upper limit) or exceed
		(lower limit) a set limit value again when the alarm is active in order to reset the alarm.
	</p>
	<p style="text-align: justify;">
		Each outgoing message also contains <code>msg.timestamp</code>, which specifies the time of the status change in
		milliseconds since 1.1.1970.
	</p>
</script>