Eaton AS-I Megablocks Passive hubs for AS-i bus networks

• AS-i bus wiring for the process industry environment

• SpurGuard™ short circuit protection with visual fault detection

• Plug-in connectors for fast commissioning and maintenance

• Choice of junction box to meet site requirements

• Power LED

AS-i Megablocks are DIN-rail mounted passive* hubs for the AS-i

network. They connect several AS-i devices to the network trunk

cable and provide short circuit and over voltage to the segment. The

AS–i Megablock itself does not contain an AS–i chip or communicate

over the AS–i network, so it consumes no network communication

resources (bandwidth, slave addresses, etc.). They are used to

interconnect AS–i master and slave devices that do contain AS–i chips.

Megablocks minimize hand wiring and allow individual devices to be

added to and removed from the segment without disrupting network

communication. A green power LED on each unit indicates whether

DC power is present. Megablocks are available in four and eight drop

versions. Multiple Megablocks are easily wired to one another to allow

larger segments to be constructed.

For simple and reliable interconnection, each Megablock has two

dedicated connections for the segment home run or trunk cable. Trunk

connections are easily identified by their black connectors. Separate

numbered connections are provided for each spur drop.

Connections to the Megablock are made using pluggable screw

terminal type connectors. This allows wire terminations to be made to

the individual connectors which are then plugged into the Megablock.

Devices can then be easily connected and disconnected during

commissioning. After commissioning, retaining screws are tightened

to secure each connector to the Megablock.

Short circuit protection Megablocks are available with built-in

SpurGuard™ short circuit protectors which prevent a short circuit in

any of the individual AS-i devices or spur cable runs from bringing the

entire network segment down. A red LED near each spur connection

indicates that a spur is shorted and is in overcurrent mode.

Internal Fault Indication

A red Fault LED is included on SpurGuard™ protected units. The red

Fault LED is lit if the AS–i Megablock diagnoses an internal failure.

The AS–i network continues to function in this condition, however, the

SpurGuard™ protection is not available.

* Megablocks contain active circuit components but do not contain an AS-i

chip or perform active repeater functions such as signal reconstruction or

amplification.