发表于:2006-10-25 10:01:00
楼主
N-Tron Corp. www.n-tron.com
China distributor:www.witjoint.com, Tel.021-54450066/fax:021-54450056
Why Use Industrial Ethernet Switches?
1. Benefits of Industrial over Commercial Switches
Industrial Ethernet Switches are designed to operate in plant floor environments. The specifications of Industrial Ethernet switches (temperature, shock, vibration, etc.) meet or exceed the equipment being connected (PLC’s, Ethernet I/O, HMI’s, etc.). Most commercial Ethernet switches have commercial temperature ratings (0-40C), and do not publish shock and vibration specs. Most Industrial Ethernet Switches are rated for a minimum of 0-70C operation, and have excellent shock & vibration specs.
In addition, Industrial Ethernet switches are housed in rugged industrial style steel enclosures using Din-Rail or panel mounting. Most commercial switches and media converters cannot mount conveniently inside equipment enclosures.
Another added benefit derived from using Industrial Ethernet switches is redundant power inputs. Commercial switches rely on a single power supply to power the switch, while Industrial switches typically run off DC power, and have redundant power inputs. This allows the weakest link (the power supply) to have a hot standby back up, insuring maximum up time.
Industrial Ethernet switches carry a Class I Div 2, group ABCD rating while the commercial counterparts do not. This allows the Industrial Ethernet switches to operate where explosive gases are being used (very typical for industrial applications).
2. Alternatives
Because Ethernet has been available in the office environment long before industrial Ethernet equipment existed, the equipment is well known for its performance and reliability and low cost. Quite often, when companies evaluate the technology, they do not examine the alternatives of purchasing Industrial Ethernet Switches versus commercial switches and routers. However, In this instance, the evaluation is simple. Fortunately, Industrial Ethernet switches provide advantages over the 4 primary alternatives being used. All of these alternatives utilize commercial Ethernet switches and hubs, and are listed below:
• Wire all connections to a climate-controlled environment.
In this scenario, the customer will place commercial network equipment in a climate cont