Publication 1769-UM005A-EN-P
4-30
Module Data, Status, and Channel Configuration
Effects of Cyclic Lead Wire Compensation on Module Update Time
The 1769-IR6 module provides the option to enable lead wire
compensation for each channel. This feature improves measurement
accuracy for 3- and 4-wire RTDs by compensating for the resistance of the
RTD lead wire. Lead wire compensation occurs automatically on a mode
change from Program-to-Run for all configured channels or if any
online
(1)
configuration change is made to a channel regardless of the type
of RTD being used. In addition, you can either configure the module to
perform a lead wire compensation cycle every 5 minutes during normal
operation or disable this feature using the Enable/Disable Cyclic Lead
Wire function (default: Enable). You can also implement a lead wire
compensation cycle anytime, using your control program to enable and
then disable this function.
If you enable the cyclic lead wire compensation function, the module
update time will increase when the lead wire compensation cycle occurs.
To limit its impact on module update time, the lead wire compensation
function is divided over 3 module scans. The amount of time added for
lead wire compensation per module scan depends on the filter frequency
(channel update time) selected for that channel.
(1) Not all controllers allow online configuration changes. Refer to your controller’s user manual for details. During an
online configuration change, input data for that channel is not updated by the module.
Содержание Compact 1769-IR6
Страница 1: ...Compact I O RTD resistance Input Module Catalog Number 1769 IR6 User Manual AB PLCs ...
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Страница 40: ...Publication 1769 UM005A EN P 3 16 Installation and Wiring ...
Страница 74: ...Publication 1769 UM005A EN P 4 34 Module Data Status and Channel Configuration ...
Страница 115: ...AB PLCs ...
Страница 116: ...Publication 1769 UM005A EN P February 2001 2001 Rockwell International Corporation Printed in the U S A ...