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5. System Functions After Upgrade

5-5

TI 33K01B10-50E

Interstation Communications

It is recommended that the control stations closely related to each other via station data link be

collectively upgraded to CENTUM VP at the same time. For upgrade work methods, see Section

5.2,“UpgradeSpecications.”Ifinter-stationcommunicationmustbeperformedforvarious

reasons between a “Non-upgraded FCS” and “Upgraded FCS,” the setup must be changed.

Communication between “Upgraded FCS” and “Non-upgraded stations” is realized using the

link block (ADL) between CENTUM VP stations, through which data reading and writing are

conducted from the CENTUM VP. CENTUM V and CENTUM-XL use data buffer to accept the

data for data processing.

Upgraded FCS (CENTUM VP):

1. Specify communication from “Upgraded FCS” to “Non-upgraded stations.” On the control

drawingbuilderofCENTUMVP,describethetagnameanddataidentierof“Non-upgraded

stations” of the communication target as the connection target of the “IN” and “OUT”

terminals of the function block.

ADL is built automatically, and communication from “Upgraded FCS” to “Non-upgraded

stations”isspecied.

IMPORTANT

ADL communications by CI/CO cannot be made because signed integer data are changed to

unsignedintegerdatawhenhandlingtherstbitof16bits.Asanothercorrectivemeasure,itis

necessary to use an appropriate computational expression.

When non-upgraded station is CENTUM V

1. If a communication error of “Non-upgraded stations” and “Upgraded FCS” is assigned to the

annunciator or interlock, cancel it.

2. Delete communication from “Non-upgraded stations” to “Upgraded FCS” using the station

connection unit screen. (Recommended)

(If the communication setup is not to be deleted, a communication error occurs at “Non-

upgraded stations”. However, there is no problem regarding control operation and

communication performance.)

When non-upgraded station is CENTUM-XL

1. Change the setup of the inter-station communication instruments in the feedback control

builder as follows.

Command switch SV=2 (Data Reference and Setting is performed, communication is not.)

Mar. 27, 2015-00

YOKOGAWA Centum-XL User Manual

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