Publication 17946.5.3 - May 1996
Summary of Changes
This publication contains new and revised information not included
in the last release.
New Information
Series A and Series B Differences
The remote I/O adapter is now a series B. The series A adapters and
the series B adapters process block transfers differently.
Series A adapters allow block transfers to continue to occur even
when an analog module is removed from its base.
With series B adapters, when a module is removed from its terminal
base, the series B adapter ceases to do block transfers to the
processor and a block transfer error bit is set in the processor. This
provides feedback to the processor that a block transfer module has
been removed.
Important: The “hold inputs” feature, selectable on the switch
assembly on the adapter, will not apply to analog
modules. If you need this feature, you must simulate
this feature in your programming.
Additional Flex I/O Modules
Three new FLEX I/O modules have been added to this publication.
• 1794-IB10XOB6 input/output combination module
• 1794-IR8 RTD input analog module
• 1794-IT8 Thermocouple/mV input analog module
European Union Directives Compliance
Information has been added to identify adherence to the required
directives when the module is CE marked.
Revised Information
Three analog modules have undergone a series change. These
modules are:
• 1794-OE4 series B 4 output analog module
• 1794-IE8 series B 8 input analog module
• 1794-IE4XOE2 series B 4 in/2 out combo analog module
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