MC-PLC | Emmeci Elettronica – Conception et fabrication de cartes et systèmes électroniques

MC-PLC - Carte de contrôle et de traitement pour les applications rapides

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Caractéristiques générales

MC-PLC - MC-PLC

Le conseil MC-PLC est un analogue de processeur et des signaux numériques nés à être utilisés dans toutes les applications normalement réalisées avec des automates programmables, présentant, en outre, l’avantage considérable d’avoir une vitesse de traitement plus élevée d’au moins 10 fois.

Avec la carte MC-PLC, il est donc possible de gérer des applications dans lesquelles l’automate serait inexact en raison de leur incapacité à suivre les signaux courts ou qui nécessitent des conseils supplémentaires pour la gestion des événements à grande vitesse.

Le conseil d’administration, dans sa version de base, présente les ressources suivantes:

  • 8 entrées bidirectionnelles (NPN ou PNP) optoisolées, dont certains peuvent être associées à des fonctions particulières (gestion de signaux d’une durée de l’ordre de millionièmes de seconde, ou la mesure des fréquences et / ou timing)
  • 8 sorties NPN (collecteur ouvert) Courant max. 100mA (non inductif)
  • 3 aux entrées analogiques 8 bits
  • Interface série RS232 (RS485 ou bien) pour la connexion PC, au terminal de programmation MC-TRM06 ou imprimante série
  • Une mémoire de type non volatile (EEPROM) de 128 octets pour enregistrer les données et les configurations (extensibles à bord jusqu’à 32 kilo-octets)
  • 2 lignes série synchrones pour les modules d’extension (entrées / sorties supplémentaires, affichage, convertisseurs analogiques / numériques et de haute lecteurs de précision numérique / analogique, l’expansion mémoire, etc.).

Détails techniques

DIMENSIONS (lenght x width x height) 125 x 77 x 52 mm
FIXTURE DIN guide
CONNECTIONS Extractable screw-on terminals for cable max.1.5 mm
POWER SUPPLY 16-28Vcc 25mA max. (with unconnected inouts and outputs)
OPTO-INSULATED INPUTS AVAILABLE 8 with PNP or NPN logic
PILOT VOLTAGE ON INPUTS 16-30 Vcc (NPN o PNP command) with input resistance 2,2Kohm
OUTPUTS AVAILABLE 8 NPN (standard) or PNP (optional) max.100mA*
ANALOGUE INPUTS AVAILABLE 3 inputs 8 bit with full-scale 5Vdc (resolution 20mV)
SERIAL COMMUNICATION PORTS 1 asynchronous serial port RS232 (or RS485) 2 synchronous serial ports for expansion modules

Foire aux questions

Comme vous pouvez programmer les fonctions d’un conseil d’administration MC-PLC?

Le conseil d’administration MC-PLC tire sa vitesse non seulement par l’utilisation d’un microprocesseur haute puissance, mais aussi par la mise en œuvre du logiciel interne via des langages de programmation particulièrement efficaces (assembleur et C) et en mesure d’exploiter leur plein potentiel.
il est donc impossible pour l’utilisateur d’entrer le MC-PLC le programme souhaité. En fait, le conseil d’administration MC-PLC est pré-programmé par EMMECI Electronics en fonction des demandes spécifiques des clients, qui se trouve avoir une carte qui ne doit être connecté électriquement à devenir fonctionnel et qui peut être, si les spécifications exigent, paramétrés avec divers périphériques (commutateurs, PC,
terminal de programmation MC-TRM06, écran tactile, etc.).

Exemples d'utilisation

High speed bottling line with double substratum presence control.

In a bottling and labelling plant of bottles of alcoholic beverages, simultaneous presence of bottle B and the label E to be applied on the cap had to be controlled. Following positive result of the control phase, the system had to start the programmer for sections of adhesive to control gun P, causing hot glue to be placed on the cap of the bottle. The problems to be overcome to fulfil this type of control were 3:

  • The 2 photocells F1 and F2 were never activated simultaneously.
  • The speed of the line could have varied considerably (production could have changed between 3000 and 18000 bottles/hour).
  • Centring precision of the spot of adhesive had to be very high (the spot had to be placed in the centre of the cap with a tolerance of just a few mm)

Solution: the MC-PLC board was used to extend the activation time of photocells F1 and F2, taking it to such a value to allow the simultaneous presence of the 2 signals. When the simultaneous condition was met, the MC-PLC sends the activation command of the spraying cycle to the programmer. The high variability in the speed of the line made it impossible to keep the times of the 2 photocells constant, which, if set for the production rate of 3000 bottles/hour, were too long for that of 18000 bottles/hour (if even just one bottle was missing, the time would not expire, causing the gun to activate accidentally). For this reason, the times associated with the 2 photocells were bound to the speed of the line by reading the encoder already installed (the rise in speed proportionally reduces the duration of the times of the photocells). To make it easier to program the system, the 2 minimum and maximum speed values were entered by means of a teach-in function (reading and saving of the current speed). Thanks to the high processing speed of the MC-PLC board, all these functions can be managed simultaneously, guaranteeing the perfect centring of the spot of adhesive. The illustration shows: B = Bottle on which the label is to be applied. F1 = Bottle presence reading photocell. F2 = Label presence reading photocell. P = Hot-melt gun E = Label to be applied CE = Loader with labels D = Distributor that takes the label from the CE loader to the application position E


Feedback control of the quantity of additive for a plastic film extrusion line.

In a system made up of 3 plastic film extrusion lines (the illustration shows just one of the 3 lines), the quantity of hot additive to be mixed with the PVC to be extruded had to be controlled, bearing in mind the quantity set by the operator and the extrusion speed. For reasons of precision, the amount of additive really dispensed also had to be controlled, compensating the speed of the pump and managing any flow alarms if compensation was not possible. Alarms from the extrusion line and from the additive containment tank also had to be managed, displaying all the anomalies and operating options on the operator panel. The meter used is the gear type with encoder. The speed of the additive pump is adjustable with a standard analogue signal 0-10V. The speed of the extrusion line is given by a standard analogue signal 0-10V. Solution: the system was fulfilled using an electronic section repeated for each of the 3 extrusion lines. Each section consists of an MC-PLC board, combined with an interface with analogue output 0-10V, capable of managing the line and controlling all the signals. The speed of the pump is set considering the data bound to the speed of the extrusion line and the quantity of additive requested and obtaining the rpm from the graph « Flow dispensed = f (rotation speed) « related to the pump, saved in the MC-PLC board. While the system operates, any differences between the theoretic quantity of additive and that really dispensed are compensated by increasing or reducing the rotation speed of the pump. The use of the serial line RS485, suitable for managing a network, enabled the 3 lines to be centralized in one single operator panel. The MC-PLC board, thanks to its numerous peripheral points and its large memory, is able to economically resolve many problems which would be difficult to resolve with other systems.


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