3

I/O Scan

Scanning begins immediately at powerup, unless a fatal diagnostic error occurs within the module. At powerup, all I/O in the remote drop, except those that are presently forced, default to Off. I/O that are forced at the time of powerup start operation in the forced state or value.

Run Mode

Following a successful powerup, a Remote I/O Scanner goes into Run mode. It remains in Run mode unless a fatal fault or other serious problem occurs. In Run mode, input modules are scanned in rack and slot order. The Remote I/O Scanner stores the input data in its own %I and %AI memories. These memories always contain the most recent value for each input.

 

REMOTE DROP

a44977

REMOTE

 

 

I/O SCANNER

 

INPUT

% I

% AI

 

MODULES

 

 

% Q

% AQ

OUTPUT

MODULES

 

 

After the input scan, the Remote I/O Scanner scans the output modules in rack and slot order, sending them the most recent output data from its internal %Q and %AQ memories.

 

REMOTE DROP

a44978

REMOTE

 

 

I/O SCANNER

 

INPUT

% I

% AI

 

MODULES

 

 

% Q

% AQ

OUTPUT

MODULES

 

 

Special±purpose modules, such as PCM, GDS, and ADS modules, are recognized by the Remote I/O Scanner but are not scanned for I/O data. These modules may be programmed to access the internal memories of the Remote I/O Scanner, where they may deposit or acquire data.

Stop/Faulted Mode

If a fatal fault occurs, the Remote I/O Scanner goes to Stop/Faulted mode. The Module OK LED is off. In Stop/Faulted mode, the Remote I/O Scanner can communicate with Logicmaster 90±70; it may be possible to place the module back into Run mode by clearing all faults from its CPU Fault Table and I/O Fault Table. This requires either a direct programmer connection or communication with the remote drop on a multidrop network. It is also possible to use a Hand±held Monitor to clear all faults to attempt a return to Run mode. Stop/Faulted mode usually indicates a hardware fault. If the fault condition is not corrected, the module will not be able to return to Run mode successfully.

44

Remote I/O Scanner User's Manual ± July 1992

Page 49 Page 51
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Image 50
GE GFK0579B user manual Scan, Run Mode, Stop/Faulted Mode
Page 49 Page 51

GFK0579B specifications

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