Rockwell Automation 1760-xxxx Pico GFX-70 Controllers User Manual - Manual (Page 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.