High Tech Electronics

FAQ

What kind of cable you suggest for the ETN connection?
The ETN transmission system is realized using a RS-485: for this kind of transmission a twisted shielded pair is suggested, with 120 Ohm impedance ( BELDEN 3079E cable or similar). The cable quality is directly related to the distance/ transmission speed ratio: if you accept a slowler transmission speed or reduced distances, you can use a lower quality cable.
 
What kind of connectors should I use for ETN modules?
We suggest to use Phoenix COMBICON female connectors or similar, step 5,08 mm.
 
What 's ETN?
ETN is a distributed control system for technical and industrial environments. Being capable of managing up to 5 million digital I/O per second, it enables a PC, a VME system or a stand-alone controller to connect I/O remote modules, ensuring very low cycle times. It is basically made up of a master card, a shielded pair and a wide range of digital, analog and axis control I/O modules to be placed on the field or on board the machine The system is based upon a deterministic protocol, completely implemented in hardware, in order to not engage the main processor of the control platform in use (PC, VME system or stand-alone card).
 
Which are the main application fields of ETN?
Owing to its features of durability and practicality, it counts thousands of applications carried out by the main Italian and International industrial groups. Main applications are: Woodworking machines, Glassworking machines, machines for ceramic production, Electro erosion machines, Plastic machines Metal working machines, Packaging, Automatic warehouses, Post marshalling plants, Energy plants, Robotics, Paper production plants, Building automation, Automotive sector, Military, Scientific research
 
Main ETN features
Master-slave architecture: The ETN system is based on a redundant structure, strictly master-slave. In this configuration a single apparatus is enabled to start the communication, and it is called master. The other apparatuses can only reply, and they are called slaves.


Hardware implemented protocol The communication protocol is completely resident in hardware, both in the master and in the slaves: it is not therefore essential to have the presence of CPU’s in both cases.

Strictly constant acquisition intervals: Determinism with respect to time is the necessary characteristic for the control of the process that, combined with the high communication speed, makes ETN suitable even for real-time applications and multitasking.

Real-time availability of data: When an I/O module is interrogated, it acquires the status of the I/O channels and returns the data in the same transaction. The duration of each transaction is always known.

Standard RS485 connection The physical connection between master and slave occurs via a serial connection RS485, made up of a screened pair, with termination resistance of 120 Ohm. It is optionally possible to use a fibre optic, thus extending the performance and the reliability.

Transmission speed up to 12 Mbit/s The standard components of the ETN are typically used with a communication speed of 1.5 Mbit/s, 3 Mbit/s or 6 Mbit/s. Upon request modules with speed up to 12 Mbit/s can also be provided.

Practically unlimited I/O: An ETN master can address up to 4080 I/O modules, equivalent to a maximum of about 130000 digital I/O’s or 65000 analogue I/O’s. These figures make the expandability problem irrelevant.

6 km distance or more: The maximum remoting distance of the ETN is tied to the RS485 and to the technology of the fibre optics. The maximum reachable distance on a RS485 connection depends on the transmission speed required; on a fibre optic the distance is virtually
independent from speed. ¨ Multi-level redundancy The ETN® system is particularly suited for high-reliability applications, where the redundancy of the control system is a requisite, as in DCS (Distributed Control System) architecture. Applications with all the combinations of redundancy of the controllers, of the physical connections or remote modules have already been developed.
 
You are using the PCBOX with Celeron 400 MHz Arbor ETX card, without any keyboard connected: What do you have to set?
Enter the BIOS and unselect the USB legacy support and parallel port parameters.

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