I/O Configuration - Emerson PACSystems RX3i User Manual

PACSystems™ RX3i and RSTi-EP CPU Reference Manual
GFK-2222AK
4.10.1

I/O Configuration

4.10.1.1 Module Identification
In addition to the catalog number, the programming software stores a Module ID for each
configured module in the hardware configuration that it delivers to the CPU. The CPU
uses the Module ID to determine how to communicate with a given module.
When the hardware configuration is downloaded to the CPU (and during subsequent
power-ups), the CPU compares the Module IDs stored by the programmer with the IDs of
the modules physically present in the system. If the Module IDs do not match, a System
Configuration Mismatch fault will be generated.
Because I/O modules of similar type may share the same Module ID, it is possible to
download a configuration containing a module catalog number that does not match the
module that is physically present in the slot without generating a System Configuration
Mismatch.
Certain discrete modules with both reference memory inputs and reference memory
outputs will experience invalid I/O transfer if incorrect configuration is stored from a
similar mixed I/O module. No fault or error condition will be detected during
configuration store and the module will be operational, although not in the manner
described by configuration.
For example, a configuration swap between the IC693MDL754 output module and
IC693MDL660 input module will not be detected as a configuration mismatch, but I/O
data transfer between the module and the CPU reference memory will be invalid. If the
input module (MDL660) is sent the configuration of the output module (MDL754) with
the following parameters:
Reference Address: %Q601
Module Status Reference: %I33
Hold Last State Enable
It will receive inputs at the module status reference %I33 and the status of the module will
be received at %Q601.
If the output module is sent the configuration of the input module with the following
parameters:
Reference Address: %I601
Input Filter: Enable
Digital Filter Settings Reference: %I65
It will output values at the digital filter settings reference %I65 and the status of the
module will be received at %I601.
4.10.1.2 Default Conditions for I/O Modules
4.10.1.2.1 Interrupts
Some input modules can be configured to send an interrupt to the application program.
By default, this interrupt is disabled and the input filter is set to slow. If changed by the
programming software, the new settings are applied when the configuration is stored
and during subsequent power-cycles.
CPU Operation
Section 4
October 2019
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