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Bus Interface Unit Power Supply

The 24 VDC power supply in the Bus Interface Unit provides power for the Bus

Interface Unit itself and logic power for all I/O modules that may potentially be installed

at that station. External power must be supplied for field wiring of input and output

devices. Specifications for the BIU power supply are listed on page 1-11.

The BIU power supply is not damaged by either of the following:

Reversing input voltage on terminals 1 and 2.

Temporary overcurrent conditions on the 6.5 VDC output.

Timing

The Bus Interface Unit provides power to all I/O modules that are installed at the station.

I/O module operation is governed by a System Reset signal to ensure controlled

operation during the power up and shut down processes. As shown in the timing

diagram below, momentary power losses of less than 10 milliseconds do not affect I/O

module operation; however, longer power losses generate a Reset for all system I/O

modules.

Profibus Bus Interface Unit

The Profibus Bus Interface Unit is a small, rugged, intelligent module with a sturdy

aluminum housing. The module has three status LEDs and a connector for a Hand-held

Programmer.

The Bus Interface Unit requires an external source of 24 VDC power.

The BIU’s internal power supply provides power for the operation of the BIU itself, and

logic power for the I/O modules connected to it.

It mounts on a separate terminal block, to which it and all field wiring are attached. The

configuration is stored in non-volatile memory located in the terminal block.

The Bus Interface Unit has a replaceable 1A, 5x20mm 250VAC slow-blow fuse on the

input power lines. The fuse can be changed without disturbing the wiring of any other

modules.

Field Control Environmental Specifications

Vibration

Noise

Temperature

Humidity

Modules perform well where vibration is a factor. Modules are installed

on a panel-mounted DIN rail using the clamp supplied, and with the

panel-mounting feet secured. For information about vibration

standards, please see the Conformance to Standards document (GFK-1179).

Modules are resistant to noise levels found in most industrial applications

when installed according to accepted practices, including proper separation

of wiring by voltage and power level. Modules must be installed on a

conductive (unpainted) DIN rail. The DIN rail is an integral part of the

grounding system.

Modules are tested to the specifications listed in the Conformance to

Standards document (GFK-1179).

Modules operate reliably in ambient air temperatures from 0C (32F)

up to 55C (131F).

Storage temperatures are ±40C (±40F) to +85C (185F).

5% to 95%, non-condensing.

For detailed installation information, please see:

Chapter 2 of this manual. It describes installation and wiring for the Bus Interface

Unit module and terminal block.

Chapter 2 of the Field Control I/O Modules User’s Manual. It summarizes installation

instructions for modules and terminal blocks.  Detailed installation instructions are

also packed with individual Field Control modules.

The individual module datasheets included in the Field Control I/O Modules User’s

Manual, which provide specific module wiring information.

Locations for Field Control

The Profibus Bus Interface Unit and Field Control I/O modules can be located on

equipment, in junction boxes, inside panels, behind operator stations, and in other

locations where space is limited. The area should be clean, free of airborne contaminants,

and provide adequate cooling. Field Control modules can be installed in NEMA

enclosures. The enclosure can be as little as 4 inches (10.16 cm) deep. A 35mm x 7.5mm

DIN rail is required.

The Bus Interface Unit Terminal Block and up to four I/O Terminal Blocks are grouped

together  using the connection cables provided. All of the I/O Terminal Blocks in a group

must be connected either before or after the Bus Interface Unit. A Bus Interface Unit

may not be connected between I/O Terminal Blocks.

Conformance to Standards (GFK-1179). This manual describes the installation

requirements for programmable control products used in industrial environments,

specifically, in situations where compliance to standards or directives from the

Federal Communications Commission, the Canadian Department of

Communications, or the European Union is necessary. The information in this

manual is applicable for GE Fanuc Series 90-70 and Series 90-30 programmable

controller products, Genius I/O products,  and Field Control Distributed I/O and Control products.

I/O Modules

Field Control I/O Modules are available in many types to suit a wide range of application

needs. Modules can be installed and removed without disturbing field wiring. One or

two I/O modules may be mounted on an I/O Terminal Block.

I/O Terminal Blocks and Auxiliary I/O Terminal Blocks

An I/O Terminal Block provides mounting, electrical, and field wiring connections.  Each half

of the I/O Terminal Block can be mechanically keyed to accept only an I/O module of a

specific type. Auxiliary I/O Terminal Blocks can be easily attached to an I/O Terminal Block.

They provide the extra connections needed for analog and high-density discrete modules.

For more information, please refer to:

Chapter 2: Installation, which explains wiring to the Bus Interface Unit, and explains

how to install the Bus Interface Unit module on the Field Terminal Block.

Chapter 5: Operation, which explains how the Profibus Bus Interface Unit services I/O.

The Field Control I/O Modules User’s Manual, which describes I/O modules and I/O

Terminal Blocks. This manual also explains module installation and field wiring.