i6-s7ip/index.js

SIMATIC S7 Driver

var util = require('util');
var nodeS7 = require('nodes7');

module.exports = device;

function device(params){
        nodeS7.call(this, {silent:true});

    	this.updateInterval = typeof(params.cycle)=='undefined'? 1000 : params.cycle;
    	this.name = params.name;
    	this.properties = {
    		host : params.host,
    		port : params.port,
    		rack : params.rack,
    		slot : params.slot
    	};
		this.enabled = params.enabled;
		this.connected = false;
		//Save tag properties
		this.tags = {};
		params.tags.forEach(tag=>{
			this.tags[tag.name] = tag;
		});
}


//Inherits nodeS7 class
util.inherits(device, nodeS7);

//method
var method = device.prototype;


method.connect = function(cb){
	//pass callback
	this.connect_cb = cb;

	//Start PLC connection	
	if(this.enabled){
		sails.log.info('[i6-device][' + this.name + '] connecting...');
		this.initiateConnection(this.properties, this._connectionHandler);
	}else{
		sails.log.warn('[i6-device][' + this.name + '] is disabled');
		cb();	
	}
}

method.disconnect = function(){
	this.dropConnection(function(){

	});
}


method._connectionHandler = function(err){
	if (typeof(err) !== "undefined") {
		//log connection status		
		sails.log.error('[i6-device][' + this.name + '] connection timeout');
	
		//call next async		
		this.connect_cb();

		//save connection state
		this.isConnected = false;
	
		//break proccess
		return;
	}

	//log connection status
	sails.log.info('[i6-device][' + this.name + '] connected');
	
	//call next async
	this.connect_cb();
	
	//save connection state	
	this.isConnected = true;

	this.items = ["_COMMERR"];
	var tagsKey = Object.keys(this.tags);

	tagsKey.forEach(tagName=>{
		this.items.push(tagName);
	});

	this.setTranslationCB(function(tag){
		return this.tags[tag].address;
	});

	this.addItems(this.items);	

	//Read all tags value
	if(this.enabled){
		var interval = this.updateInterval;
		var conn = this;
		if(!this.timerUpdate){
			setInterval(function(){
				conn.readAllItems(valueReady);	
			}, interval);
		}
	}

	//old read interval method

	/* var conn = this;
	setInterval(function(){
		conn.readAllItems(valueReady);
	}, 500); */
}


//Tulis val ke addr PLC
method.writeToDevice = function(addr, val){
	if(this.isoConnectionState==4){
		this.writeItems(addr, val);
	}
}

function valueReady (err,values){
	if (err) {
		sails.log.error("[i6-device][" + this.name + '] something wrong when read values!');
	}
	var keys = Object.keys(values);
	keys.forEach(key=>{
		//Save previous value
		var _previous = i6.tags[key];

		//Update tags variable
		i6.tags[key].value = err? 0 : values[key];
		i6.tags[key].timestamp = new Date();
		i6.tags[key].status = err? "BAD" : "GOOD";
	});
}