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Multibus II

From Idea to Standard

In the early 1980s some manufacturers build a consortium together with Intel in order to

improve and standardize a bus architecture “Multibus II” which is based on Multibus I.

The new system should offer the following key features:

• Eurocard board sizes and DIN-connectors

• self-test capability

• software jumpers for configuration

• fast 32-bit bus

• functional partitioning (using LAN concepts)

• reliability

• inter-operability

These properties were defined 1987 in the standard IEEE 1296 as Multibus II-standard.

Definition

The standard IEEE 1296 describes the function of Multibus II as follows (abstract):

MULTIBUS II is parallel system bus (PSB). It provides a high-performance backplane bus

intended for use in multiple processor systems, with synchronous, 32-bit multiplexed ad

dress/data, with error detection, using a 10 MHz bus clock. The bus performance is

approx. 32 to 40 MByte/s. Current systems offer up to 80 MByte/s.

Introduction

Where to Use This Board

The board ibaLink-MBII-io is an interface board in Eurocard size (double) for Multibus II

systems.

The board is to be used for data transmission from a Multibus II system to an ibaPDA or

ibaLogic system or for realization of a so called frame-to-frame connection.

The board provides two pairs of fiber optical senders/receivers on the front panel.

Each sender/receiver pair can transmit up to 64 analog and 64 digital signals in each di

rection.

The ibaLink-MBII-io board uses an assigned memory range in the backplane memory of

the Multibus II system. The data to be measured should be written into this memory

range by the supporting system, then converted by the board and transmitted to an iba

system via the standard fiber optical interface with 3.3 Mbit/s.

The fiber optical receiver is used for data sent by an ibaLogic system to the Multibus II

system or for receiving data coming from other iba devices and systems (ibaPADU,

ibaLink-SM-64 / -128 etc.

A cross-over point-to-point connection between an ibaLink-MBII-io card and other iba

components with fiber optical sender/receiver may be sufficient to exchange data without

any software application from iba.

System requirements

Hardware

 PC with at least:

 At least one free PCI/PCIe slot (PC) or ExpressCard slot (notebook)

 Min. 512 MB RAM

 4 GB free disk space for measured values

 At least one fiber optic card of type ibaFOB-D,

(Firmware version V2.00 build 176 (C6) or higher), e. g.

 ibaFOB-io-D/ibaFOB-io-Dexp

 ibaFOB-2io-D/ibaFOB-2io-Dexp

 ibaFOB-2i-D/ibaFOB-2i-Dexp  optional with extension module ibaFOB-4o-D*

 ibaFOB-4i-D/ibaFOB-4i-Dexp  optional with extension module ibaFOB-4o-D*

 ibaFOB-io-ExpressCard

 Double fiber optic patch cable for a bidirectional connection between

ibaNet750-BM-D and ibaPDA-PC (suitable FO patch cables are available at iba).

* The extension module is required for bidirectional connections, it is mandatory

with 32Mbit Flex, and optional with 32Mbit and 3Mbit.

Software

 ibaPDA version 7.3.0 or later

 ibaLogic-V4 version 4.2.5.464 or later (no 32Mbit Flex)

 ibaLogic-V5 (no 32Mbit Flex)

Firmware

 ibaNet750-BM-D ab Version 01.03.005

An ibaFOB-D input card is required on the PC side. If ibaNet750-BM-D is used as re

placement for the predecessor ibaNet750-BM, even older PC cards (ibaFOB-io, ibaFOB

4i and ibaFOB-4i-S) can act as receivers.

Additionally each station can simultaneously be used as output device (like ibaPADU-8

O). This is in particular necessary when terminals with set/reset function are used, e.g.

counter etc. For this purpose, an ibaFOB-D card with output(s) is required on the PC

side.

To add more functions, ibaNet750-BM-D can also be used with the ibaLink-SM-64-io,

ibaLink-SM-128V-i-2o or ibaLink-VME card. This allows to create simple I/O extensions

for the systems Siemens Simatic S5 115U, 135U, 155U, as well as Siemens MMC216

and VME buses.

Characteristics in 3Mbit mode:

 Works as input and output station at the same time

 32+32 analog inputs and outputs plus 32+32 binary inputs and outputs per station

or

 Up to 512+32 binary inputs plus 512+32 binary outputs

or

 Eight complex terminals (i.e. SSI,  incremental encoder  etc.),

 Fiber optic compatible with ibaPADU-8 and ibaPADU-8-O, that means up to 8

ibaNet750-BM-D I/O-devices on 1 bus (ring or star topology)

 Integrated power supply for the modules (internal load up to 1.5 A)

 For operation with ibaPDA there are restrictions regarding the time behaviour of the

terminals (no guaranteed simultaneous plant snapshot of all signals within 1ms cy

cles).

 Operation without PC. Using this device mode, it is possible to replace conventional

copper wire bundles with ibaNet750-BM-D devices (up to 8x 136 digital signals in

each direction on 2 fiber optics).

The behavior of the device at the iba fiber optics bus is identical to one or four ibaPADU

8. ibaPADU-8AI-U/-I or ibaPADU-O devices. That means, that every device can send

and receive 8 (or 32) analog channels (16 bit each) and 8 (or 32) binary channels (8 bit),

in total 17+17 (68 + 68) Byte net data cyclically every millisecond. The devices can be

cascaded like ibaPADU-8 (ibaPADU-8-O) devices, with up to 8 devices per cascade. The

device converts the incoming data stream from the fiber optic link simultaneously and

exactly to the millisecond for all channels, regenerates the optical signal and sends it to

the other devices within the cascade. It is allowed to mix ibaPADU-8. ibaPADU-8-O and

ibaNet750-BM-D devices within an optical link.

The device supports different ibaNet protocols:

32Mbit Flex

Using 32Mbit Flex, configuration as well as process data is transmitted via a bidirectional

fiber optics connection. ibaPDA automatically detects the modules used and the signals

can be easily selected and configured by mouse click.

With 32Mbit Flex, the sampling rate can be flexibly set up to 40 kHz. The maximum data

volume to be transmitted depends on the adjusted sampling rate. The following rule ap

plies: the higher the sampling rate, the lower the data volume. The ibaPDA application

automatically determines the maximum sampling rate, which depends on the desired

data volume and the number of devices in the ring.

With the ibaNet protocol 32Mbit Flex, it is possible to connect up to 15 devices to a ring

topology. The signal limitation applies for the entire ring. Thereby, the distance between

the devices can be up to 2 km. Other 32Mbit Flex-enabled iba devices can be integrated

into the ring as well.

32Mbit

The 32Mbit protocol is especially used with ibaLogic-V4 version 4.2.5.464 or later. With

the 32Mbit protocol it is possible to connect an ibaNet750-BM-D system to ibaLogic with

a data transmission rate of 32 Mbit/s. The cycle time is 500 µs and up to 256 (REAL) /

512 (INT) analog and digital signals are transmitted. A bidirectional fiber optic connection

is necessary in order to integrate output terminals.

3Mbit

Using the 3Mbit protocol, the device is compatible to the previous ibaNet750-BM version.

Up to 8 devices may be connected in a line topology and used as pure input or output

devices. If input and output signals should be processed at the same time, it is recom

mended to use a ring topology. Moreover, the devices may operate peer-to-peer without

a PC involved. The cycle time is 1 ms in all applications.

Introduction

ibaNet750-BM-D is a device designed to extend the range of iba I/O functionalities using

the I/O modules of the series 750 produced by WAGO and terminals for the K-bus by

Beckhoff. The device acts as a gateway between the serial K-bus and the deterministic

fiber optic ibaNet protocol.

The WAGO I/O system is the ideal supplement for the range of the peripheral devices.

Digital and analog WAGO/Beckhoff I/O terminals as well as incremental encoders, SSI

inputs, resistance thermometers, thermocouples and measuring bridges can be inte

grated into the system.

Up to 255 WAGO I/O terminals can be connected to ibaNet750-BM-D and a data volume

of up to 2048 Bytes can be transferred over the K-bus.

The signals are internally converted and are available via the fiber optic interface. For

the connection to a data acquisition system, such as ibaPDA, an ibaFOB-D card is used

with a bidirectional fiber optic cable connection.

The ibaFOB-4i-S or ibaFOB-io-S devices represent the new generation of iba’s fiber optic

PC boards. These boards replace the ibaFOB x/4. ibaFOB x/4-F and ibaFOB 2/2 IO boards

which were based on the PC ISA bus definition. The new boards are 100% com-patible

on the fiber optical bus side while in the PC the interface and dual port ram layout differ

between the old and new boards.

The new cards features are:

 Full Plug&Play functionality.

 Enhanced throughput on the PC bus side.

 Enhanced card diagnostics and card information (LEDs and 7-segment display).

 Two modes of operation: F-mode and M-mode, to be selected for each FO-port in-dividually

 Optional synchronization modules for synchronizing multiple systems in conjunction with ibaScope

The following devices can be connected:

 ibaFOB x/4 (ISA)

 ibaFOB x/4-F (ISA) with ibaFOB-OF-Link

 ibaFOB 2/2 I/O (ISA)

 ibaLink-SM-64-io (Siemens Simatic S5 115U, 135U 155U; MMC216 all types)

 ibaLink-SM-128V-i-2o (VME32 & VME64 rack)

 ibaNet750-BM (Wago IO system 750)

 ibaBM-FOX-i-3o (FO-splitter and repeater)

 ibaPADU-8. ibaPADU-8-ICP, ibaPADU-8-M, ibaPDAU-8-S, ibaPADU-16.

ibaPADU-32-T, ibaPADU-32-R and ibaPADU-8-O (A/D & D/A -converter)

 ibaBM-SLM (Simolink Monitor for Siemens Motion Link Bus)

 ibaBM-DDCSM (Monitor for ABB DDCS+ Drivebus)

 Adjustable bus timing (ring topology in combination with ibaLogic only!)

 Easy handling without the termination problems of copper based systems

 The integration in hazardous areas is no problem in terms of EMI due to the

fiber optic communication concept.

 One source can be accessed by multiple clients at the same time by just multiply-ing

the optical fibers (ibaFOx-3 and ibaFOB-OF-Link splitting devices) – so I/O pe-ripherals

may be used for process control and measuring at the same time.

This also makes redundant structures easy.

 100% compatibility to its predecessors based on the ISA bus

The boards ibaFOB-io-PCI, ibaFOB-io-S, ibaFOB-4i-PCI, ibaFOB-4i-S, ibaFOB-4o

and ibaFOB-OF-Link are fiber optic communication cards which are used to connect

a stan-dard PC to the iba peripheral devices such as ibaPADUs, ibaNet750-BM

devices and ibaLink signal modules (SM).

As far as the following text does not refer to a particular card, the boards are

referred to as ibaFOB boards.

The unique peripheral I/O concept based on the ibaFOB boards, features

characteristics otherwise unknown on standardized field buses such as:

 Full deterministic transmission profiles for all fiber optic buses and connected

devices (1ms).

 Internal and/or external synchronization on the bus, even for more than one

bus with programmable cycle times between 1.0 and 9.9 ms in steps of 100 μs.

 Deviation less than 2 μs between several busses (external synchronization)

 The iba fiber optic transmission standard integrates not only A/D converters

(ibaPADU) but a huge variety of PLC interfaces and hence allows the realization

of heterogene-ous measuring and I/O topologies.