3

Outputs from the Host to a Remote Drop

Each time the host's Bus Controller has the bus communications token, it sends any outputs it has received from the CPU to the devices on the bus. Outputs for the Remote I/O Scanner are sent in one output data message, with all configured discrete outputs followed by all configured analog outputs.

a

To

Remote

Drop

Output Data Message

(up to 128 bytes)

 

discrete outputs

 

 

analog outputs

 

 

 

 

 

 

 

 

a Configured %Q Length '

 

a Configured %AQ Length '

 

 

 

 

 

 

 

 

 

 

 

%Q starting reference data

 

 

%AQ starting reference data

 

 

 

The lengths of each portion are equal to the configured lengths of %Q and %AQ data selected for the Remote I/O Scanner (regardless of the host CPU type or the actual amount of output data needed for the modules physically present in the remote drop). Either length may be zero.

The Series 90±70 Bus Controller automatically places the %Q data ahead of the %AQ data, in accordance with the configuration supplied to the host PLC for the remote drop. Other PLCs and computers need to prearrange the data in the order expected by the remote drop. Each discrete output module will receive one byte of data for each eight circuits. Each analog output module will receive two bytes (one word) for each analog channel.

As soon as new output data is received, the Remote I/O Scanner checks it to be sure the data is error±free and of the correct length. The length must match the combined lengths of the discrete output data and analog output data that have been configured for the Remote I/O Scanner. After verifying the accuracy of the data, the scanner puts the data in the %Q and %AQ tables, and begins passing it to the output modules in the remote drop.

Output Defaults

On powerup, all outputs are turned off (analogs go to zero), except those inputs and outputs which had previously been forced±±they go immediately to their forced state or value.

If CPU communications are lost for 3 bus scans, all outputs that are not presently forced will either default or hold their last state, as configured using the Logicmaster 90±70 software. If all configuration for a remote drop is done with a Genius Hand±held Monitor, this selection cannot be made and all outputs will default to Off (or 0 for analogs).

48

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

Page 53 Page 55
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Image 54
GE GFK0579B user manual Outputs from the Host to a Remote Drop, Output Defaults
Page 53 Page 55

GFK0579B specifications

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