3

Data Transfer with the Host

Each bus scan, a Remote I/O Scanner exchanges the following data with the host PLC or computer:

HIt sends an input message with up to 128 bytes of %I and/or %AI inputs.

HIt receives an output message with up to 128 bytes of %Q and/or %AQ outputs.

The exact length and content of these messages is determined by the remote drop I/O map configured for the Remote I/O Scanner. The data from each table (%I, %AI, %Q, and %AQ) must be contiguous. Data formats are explained on the following pages.

Communications on the Genius Bus

After a Remote I/O Scanner completes a successful login with the controlling PLC or computer, it begins sending the input data it has scanned from the input modules and accepting output data for the output modules it controls.

The scanner's communications with the host are performed asynchronously. When the scanner receives the Genius bus communications token, it sends the most recent data from the configured portion of its %I and %AI memories on the bus. As described above, these memories are repeatedly updated whenever the Remote I/O Scanner scans the input modules in the remote drop.

The scanner receives new outputs from the host when the host's bus controller has the communications token. It places these outputs into the configured portion of its %Q and %AQ output tables. These outputs are then passed to the devices in the remote drop on the nextI/Oscan.

The Genius bus scan time may vary from 3±400mS, but 20±30mS is typical.

Update Rate

Depending on the number and types of I/O modules in a remote drop, the update rate is typically in the range of 4±7mS, if there is no programmer activity. If the Logicmaster 90±70 programmer is physically attached to the Remote I/O Scanner, and is in On±line mode, it slows the update rate by about 10mS.

Throughput

If an output in the remote drop is tied to an input in the same remote drop, the output changes state (or value, in the case of an analog output module) within a few milliseconds of the new output being sent from the bus controller to the Remote I/O Scanner. (To guarantee that an output changes state, it must be present for at least one Genius bus scan time).

The input which is tied to the output responds as soon as any load±effects have settled out and input filtering is completed. This may occur as soon as the Remote I/O Scanner 's nextI/Oscan.

An input must be present for at least one PLC sweep time plus one Genius bus scan time to guarantee its detection by the host. If the input changes state only briefly, and then changes again before the input data is sent on the bus, the change may be overwritten by some new input state or value before it can be sent.

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

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GE GFK0579B user manual Data Transfer with the Host, Update Rate, Communications on the Genius Bus, Throughput
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GFK0579B specifications

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