Signal acquisition

To enable the Retrofitting, two types of signals might be acquired from the machine.

Digital Signal Acquisition

Basics

Digital signals are Voltage signals that rappresent a logic value. They are rappresented with value 1 for logic value true and 0 for the logic value false. Usually they are used as pices counters or alerts/machine status.

Hardware Acquisition

Digital signals can be acquired connecting the logic line of the machine to one of the Digital Input of the Zerynth Device (usually on the 0-36V range). A free contact relay can be placed between the logic line and the Digital Input to avoid overtension on the device.

Software Acquisition

Digital signals acquisition can be enabled by the configurator both using the wizard and the graph editor.

• Wizard: most of the applications supported by the wizard allow the user to configure digital signal acquisition.

  • Digital signals as counters: in the following image a Digital Input is configured to acquire a logic signal that rappresents the number of pices produced.

  

  The pieces counter in the above image is configured to use a logic pulse to count produced good pieces. The pusle must be at least 100 ms long to increase the counter (minimum pulse duration) with the active value configured to logic true (Polarity). An additional counter line can be activated to count bad pieces with the toggle button.

  • Digital signal as alarm: in the following image a Digital Input is configured to acquire a machine's alarm.

  

  The alarm in the above image is configured to trigger when the logic value of the line is true. This will also generate an alarm event that will be sent to the cloud interface. Configurable settings are name of the alarm and trigger value.

• Graph Editor: digital inputs are suppoted by the graph editor throught the Level Sensor node.

  

  In the above image, a Digital Signal is acquired using a Level Sensor node. This node acquire the signal interfacing directly to the hardware and generates an output with the acquired value, which can be used as input by other nodes. In this case a status node is using the Level Sensor output as input to decide the machine status.

Analog Signal Acquisition

Basics

Analog signals are Voltage or Current signals that are used to rappresent a physical property of the machine. Analog Signals are discrete and are acquired throught Analog to Digital Converters (ADCs). Thay are usually used in retrofitting to acquire che power consumptions of the machine with the use of a Current Clamp. The

Hardware Acquisition

Analog signals can be acquire connecting the signal line of the machine or of the analog sensor used (Clamps, etc...) to one of the Zerynth Device, which support Voltage (0-10V), Current (4-20mA) or resistive measurements.

Software acquisition

Analog signals acquisition can be enabled by the configurator using both the wizard and the graph editor.

• Wizard: most of the application supported by the wizard allow the user to configure analog signal acquisition thought a Current Clamp sensor.

  

  In the above image, the wizard is used to configure an Analog signal acquisition throught an 0-5 V/200 A Current Clamp sensor. The analog acquisition is configured to read the consumptions of machine connected to a 230 V line with a single phase power supply. The Machine Status will be considered working when the consumption will be above 5 A.

  

  As shown in the above image, Analog Signals can be used to generate alarms when a certain threshold in W is surpassed (1000 W in the example). Configurable settings are name of the alarm and trigger value in W.

• Graph Editor: Analog Signals are supported by the graph editor throught a multitude of Nodes, more precisely by the generic AnalogSensor node and by the specific PowerSensor, VoltageSensor, CurrentSensor, and ResistiveSensor nodes.

  

  In the above image, an Analog Signal is acquired using a PowerSensor node. This node acquire the signal interfacing directly to the hardware and generates an output with the acquired value, which can be used as input by other nodes. In this case by an Aggregator that will aggregate the acquire data in different outputs.

  

  All the analog sensors node, can be configured to adapt to the user specific case. The above picture shows the settings of the example. Since we are using a 0-5 V clamp the Chtype is set to voltage, with 1000 sps, 1 pga and 1 Sample per measurement. The conversion is LinearConversion. The signal is acquired throught the Channel 1 of the EXP-IO1 of the kit.