Rockwell-automation 1760-xxxx Pico GFX-70 Controllers User Manual Manual de usuario descargar pdf (Pagina 363)

Publication 1760-UM002B-EN-P - March 2005

Inside Pico GFX-70 8-9

Transfer Behavior

The input and output data of the expansion units is transferred serially in both

directions. Take into account the modified reaction times of the inputs and

outputs of the expansion units.

Input and Output Reaction Times of Expansion Units

The debounce setting has no effect on the expansion unit.

Transfer times for input and output signals:

• Local expansion

– Time for inputs R1 to R12: 30 ms + 1 cycle

– Time for outputs S1 to S6 (S8): 15 ms + 1 cycle

• Decentralized expansion

– Time for inputs R1 to R12: 80 ms + 1 cycle

– Time for outputs S1 to S6 (S8): 40 ms + 1 cycle

Function Monitoring of Expansion Units

If the power supply of the expansion unit is not present, no connection can be

established between it and the basic unit. The expansion inputs R1 to R12,

R15, R16 are incorrectly processed in the basic unit and show status 0. It

cannot be assured that the outputs S1 to S8 are transferred to the expansion

unit.

The status of the internal input I14 of the basic unit indicates the status of the

expansion unit:

• I14 = “0”: expansion unit is functional

• I14 = “1”: expansion unit is not functional

WARNING

Continuously monitor the functionality of the Pico

GFX-70 expansion to prevent switching errors in the

machine or plant.

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