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A bus transmitter module is interrogated about what expansion racks are present in the system. Based on the bus transmitter module¡¦s response, the CPU adds those racks and their associated slots into the list of slots to be configured. Finally, the I/O Scanner performs its initialization. The I/O Scanner initializes all the I/O controllers in the system by establishing the I/O connections to each I/O bus on the I/O controller and obtaining all I/O configuration data from that I/O controller. This configuration data is compared with the stored I/O configuration and any differences reported in the I/O Fault Table. The I/O Scanner then sends each I/O controller a list of the I/O modules to be configured on the I/O bus. After the I/O controllers have been initialized, the I/O Scanner replaces the factory default settings in all I/O modules with any application-specified settings.

Maximum Open Circuit Voltage 22 V Response Time (DAC input code to output) settles to within 1% of final value within 80 ms Gap (0 mA) of Output to Field on Switchover 10 ms maximum (applies to Redundancy only) Function The Analog Output (AO) Module delivers high-level constant current to actuators and recording/indicating devices. Notable Features ? Extensive self-diagnostics ? Optional redundancy ? Safe-state (FAILOPT) behaviors configurable on a per channel basis ? Output read-back and alarm on discrepancy ? Non-incendive output

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