ABB UNS0119A-P 3BHE029153R0101 3BHE029154P3 Excitation module

Ethernet – 10Base2 10Base2 Ethernet is a linear network with nodes fitted along the length of one network; it cannot cope with spurs. The connections use 50 Ω coax cables (e.g. RG58). The rules for connecting 10Base2 Ethernet are given below. • The maximum length of a segment without repeaters is 185 m. • A maximum of 4 repeaters are allowed to extend a segment, where the cable length between the repeaters is less than or equal to that of a non-repeated cable segment and 2 segments must be links only (i.e. no connections apart from the 2 repeaters)

Cable Wiring for RS485

 Notes: Labels are shown the same as those on the Product Descriptions. RX/TX = Receive circuit in 4 wire applications. Multiplexed circuit for 2 wire applications. GND = Signal Ground. There are actually 2 identical connectors on the Interface Adapter for each port. This is to allow either side of multi-drop connections to be connected to separate connectors. No ‘To’ connections have been shown as there is no standard connector for RS485 and many devices have terminal blocks for the connections.

• The maximum number of nodes

 on a segment is 30 and includes any repeaters. • There should be a minimum of 0.5 m between nodes. • Each cable segment must be terminated at either end with a 50 Ω termination. • The connections to each device must be by T-connectors directly onto the BNC jack provided. A spur from the network to the device will cause reflections in the cabling and stop the network working correctly. • The screen of a segment may be earthed for safety reasons if required, but only at one point on the segment.

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