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Configuring the PLC for Fisher PROVOX

D-2

TIWAY I Gateway User Manual

D.1 Considerations for Configuring a TIWAY I/PROVOX System

configure the PLC to operate with the Fisher PROVOX Programmable

Controller Interface Unit (PCIU), you need to consider the following

restrictions and requirements.

•

A maximum of eight PLCs can be networked with each PCIU on a

PROVOX system.

•

A total of 64 data registers can be distributed in V

-memory across one

to eight PLCs on the PCIU.

•

The PCIU can be configured to access up to 8 blocks of contiguous

V-memory

. These blocks may encompass up to 64 words of data. The

network cannot access any data that is not defined in one of these

blocks.

•

Data can be read from and written to contiguous blocks of V

-memory.

• W

ords within a block of V

-memory may be defined as integer or discrete

registers. The values of the discrete registers correspond to the values

of a contiguous block of 16 Y points.

•

For each V

-memory block in a PLC that the PCIU is configured to read,

the first word in the block must be reserved as a status register

. This

word does not count toward the 64-word limit.

•

All registers should be defined in the V

-memory of the PLC. The

starting V

-memory address for each PLC register block must be

configured in the PCIU.

•

Each PLC should have an address assigned to it ranging from 1 to 247.

These requirements have several important consequences in network and

PLC program design.

The restriction to 8 contiguous memory blocks defined for a given PCIU

means that there is a maximum of 8 PLCs that the PROVOX system can

access on a single TIW

Y I network. However

, if more than one contiguous

block is defined within a single PLC, then for every block after the first in

the PLC, one less PLC on the TIW

Y I network can be accessed by the

PCIU. For example, if 3 V

-memory blocks were defined for each PLC

connected to the PROVOX system, then a maximum of 2 PLCs could be

attached to each PCIU, with each PCIU having 2 unused memory blocks.

PLC Configuration

Requirements

Network Design

Considerations

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