Specifications

Introduction

31004624 8/2009

Physical Layer

The physical layer contains a single twisted pair of shielded wires. The

STB NIB 2212 INTERBUS implements the SUPI 3 (serial universal peripheral

interface) ASIC from Phoenix Contact.

Network Topology

The INTERBUS network observes a master/slave model with active ring topology,

having all devices integrated in a closed transmission path. There are three types of

bus structures in the ring:

z remote bus—The Advantys STB island (with an STB NIB 2212 INTERBUS NIM

at the head) connects to this section. Remote bus characteristics include:

z 12.8 km (maximum) network length

z 512 possible connections

z 400 m (maximum) between devices

z 256 devices (maximum)

z local bus (not supported)—The local bus ring is used to connect I/O devices in a

remote substation enclosure. Local bus characteristics include:

z 8 devices (maximum)

z 1.5 m (maximum) between devices

z 10 m (maximum) network length

z 800 mA (maximum) current

z sensor loop—The sensor loop is connected directly to sensors and actuators

without the use of bridge routers. Sensor loop characteristics include:

z 1 unshielded pair (+ 24 V)

z 32 devices (maximum)

z 10 m (maximum) network length

NOTE: An Advantys STB island with an INTERBUS NIM head can be implemented

only as a remote bus node.

Transmission Media

While it is possible to connect INTERBUS devices with a variety of media (fiber

optics, SMG, etc.), the STB NIB 2212 NIM only supports networks that are

connected with twisted pair copper wiring (RS-485). Network connectors (in and out)

are 9-pin SUB-D (see page 25) types. The TDMA transmission method is

implemented for transmission rates of 500 kbits/s.